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CHEMISTRY > UNIT#11 s AND p BLOCK ELEMENTS > Flashcards

UNIT#11 s AND p BLOCK ELEMENTS Flashcards

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1
Q

Which of the following represent elements in order o decreasing atomic size?

A

Li, Be, B

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2
Q

Which of the following will remain constant along the period?

A

Shell Number

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3
Q

The correct order of atomic radii is:

A

F<li>

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4
Q

Increase in atomic size down the group is due to:

A

➡Addition of shells
➡Shielding Effect

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5
Q

Atomic radius of fluorine is only larger than ____ in its period.

A

Ne

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6
Q

Which one of the following is smallest in size?

A

Na+

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7
Q

Consider the iso-electronic species, K+,S-2,Cl- and Ca+2, the radii of the ion decrease as:

A

S-2>Cl-1>K+>Ca+2

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8
Q

The radius of fluorine atom is 72pm and that of the fluoride ion(F-) is:

A

133pm

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9
Q

One of the following species is iso-electronic with Ca+2. Which is that:

A

Ar

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10
Q

The radii of H, H+ and H- are in the order of:

A

H->H>H+

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11
Q

The ionization energy of an element is:

A

The energy required to remove the outermost electron of an atom of the element

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12
Q

The 1st ionization energy of metal is lower and 2nd ionization energy is high, it indicate that group number is;

A

IA

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13
Q

The greater 1st ionization energy would be associated with which of the following configuration:

A

1s2, 2s2 2p6

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14
Q

Which one of the following series is arranged in order of increasing value:

A

The first ionization energies: Oxygen, Fluorine, Neon

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15
Q

In the periodic table, the ionization energy of elements of decreases from top to bottom because of:

A

Increase in atomic size

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16
Q

In the following, the element with the highest ionization energy is:

A

[Ne] 3s2 3p3
(Due to extra stability of half-filled orbital)

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17
Q

The unit of ionization energy is;

A

KJ/mol

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18
Q

Which of the following is NOT true about electronegativity?

A

➡Metal has electronegativty less than 2❌
➡With increase in Oxidation state, Electronegativity decreases✅
➡It has not unit❌
➡It determines the polarity of molecule❌

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19
Q

The power of an atom to attract shared pair of electrons towards itself in a molecule is called:

A

Electronegativity

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20
Q

Which one of the following periodic properties has no unit:

A

Electronegativity

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21
Q

Which statement is correct?

A

➡Loss of valence electron may lead to loss of valence shell
➡Radius of isoelectronic ions decrease left to right in 3rd period
➡Anionic radius increase with magnitude of negative charge

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22
Q

Which of the following element has greater negative first electron affinity?

A

C

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23
Q

Which of the following group of elements have positive 1st electron affinity

A

I

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24
Q

Melting points of group Iia elements are considerably higher than those of group IA elements because:

A

IIA provide more binding electron

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25
Q

The lowest melting point among these four elements is of:

A

Mg

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26
Q

The highest melting point among these elements is of:

A

Nitrogen

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27
Q

Generally the melting point decreases from VA to VIIIA along the period but with the exception of;

A

Sulphur

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28
Q

Among the given elements of period 3, the highest value of melting point is observed:

A

Si

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29
Q

Correct oder of melting point of group IIA elements

A

Be>Ca>Mg

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30
Q

In which group melting and boiling point decreases down the group:

A

IA

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31
Q

The element which has boilng point less than 0C is:

A

Nitrogen

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32
Q

Which of the following is incorrect information;

A

➡Metals have free electrons in the valence shell
➡Electrical conductivity of metals increases with the increases of temperature
➡Metalloids are poor conductors of electricity
➡Non-metals have atomic conductance usually less than 10^-10 ohm-1

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33
Q

Which of the following group of elements have extra ordinary high value of electrical conductivity

A

IB
(Coinage matals➡Cu,Ag,Hg)

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34
Q

Which one of the following alkali metals orms only normal oxide when it reacts with O2;

A

Lithium

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35
Q

The elements of group I-A react violently with water and make the solution

A

Alkaline

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36
Q

What is the nature of reaction Li2O + H2O➡2LiOH

A

Acid-base

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37
Q

Which of the following metal can form peroxide with oxygen;

A

Ba

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38
Q

Which one of the following doesn’t react with water even at red hot temperature:

A

Be

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39
Q

Addition of second electron to a uni-negative ion always:

A

Endothermic Process

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40
Q

Calcium and Magnesium react with ______ to for hydrogen gas

A

Dilute Nitric acid

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41
Q

Shells in calcium are:

A

4

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42
Q

In M shell, which sub-shells are present:

A

➡s
➡p
➡d

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43
Q

When Al is burnt in air fame produced will be:

A

White

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44
Q

Choose the most basic oxide:

A

Na2O

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45
Q

Gypsum is applied to the soil as a source of:

A

➡Ca
➡S

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46
Q

The _____- study of compoisition of pure substance in 17th century clearly shows that few elements are components of many substances;

A

Quantitative

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47
Q

In periodic table, the period number tells the:

A

Number of shell

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48
Q

The ionic radius of an ion is the radius of the ion while considering it to be ____ in sample.

A

Spherical

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49
Q

Sodium is not observed in +2 oxidation state because of its:

A

High second ionization potential

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50
Q

Electron afinity of an atom is the energy released when an electron _____ to an empty or partially filled orbital of an atom to form:

A

➡Added
➡Cation

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51
Q

By increasing which of the following factor polarizability increases?

A

Atomic Radius

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52
Q

Which of the following faily is linked with plant ashes?

A

Alkali metals

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53
Q

Which ion will have a maximum value of the heat of hydration?

A

Al+3

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54
Q

Covalent chracter of hydrides decrease___?

A

Down the group

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55
Q

Which one is an index to metallic character?

A

Ionization Energy

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56
Q

Which one of the following carbonate is water-insoluble?

A

CaCO3

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57
Q

Due to formation of protective layer of oxides at aluminium oxide surface, it is hard to burn it:

A

Completely in oxygen

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58
Q

Crystals of Na2Co3.10H2O when exposed:

A

➡Lose water
➡Remain solid

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59
Q

Ionziation energies of atoms depends upon the factors:

A

➡Atomic Radius of atoms
➡Shielding effect of inner electrons
➡Nature of orbital

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60
Q

Alkali means:

A

Ash

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61
Q

As far as nuclear charge increases, the decrease in ionic radii will also;

A

Large

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62
Q

Which of the following element has highest electronegativity?

A

Fluorine

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63
Q

The msot common positive ions are formed by the atoms:

A

Metals

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64
Q

The shielding effect is also called:

A

Screenng effect

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65
Q

Size of molecule depends on:

A

➡No. of atoms
➡Shape of atoms
➡Nature of atom

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66
Q

Energy required to remove an electron from gaseous neutral atom is:

A

Ionization Energy

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67
Q

The elements for which the value of ionization energy is low can:

A

Lose electron readily

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68
Q

Which one remaisn same along a period?

A

Numebr of shells(orbits)

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69
Q

More the ionization energy of an element

A

Less the metallic character

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70
Q

Along a period ,atomic radius decreases. This gradual decrease in radius is due to;

A

Increase in number of protons in the nucleus

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71
Q

What is the trend of melting and boiling points of the elements of short periods as we move from left to right in a periodic table?

A

Melting and Boiling Points first increase then decrease

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72
Q

Arrange the following elements according to the trends of ionization energies C,N,Ne,B

A

B

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73
Q

Keeping in view the size of atoms, which order is correct?

A

Li>Be

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74
Q

Which one of the following will have the smallest radius?

A

Si+4

75
Q

The ionic radius of fluoride ion is;

A

136pm

76
Q

Ionic radius along the period decreases due to;

A

Increase in nuclear charge

77
Q

Down the group acid-base behaviour of metalic oxides of group 2 elements changes to:

A

More basic

78
Q

In period 2 and period 3 maximum melting point shown by elements:

A

➡Carbon
➡Silicon

79
Q

The strongest acid among the following is:

A

HI

80
Q

When the elements of group 2A are exposed to air, they quickly become coated with the layer of oxide. What is the purpose of this oxide layer

A

The oxide layer protects the metal from further attack

81
Q

Alkaline earth metal hydroxides decompose on heating. Which of the following reactions is a correct representation of this decomposition?

A

M(OH)2 ➡MO2 + H2O

82
Q

Melting points of group II-A elements are higher than those of group I-A because;

A

Atoms of II-A elements provide two binding electrons

83
Q

Among the following, which one is least reactive metal:

A

Be

84
Q

Melting point of Na & Mg decreases down the group due to:

A

Increment in size

85
Q

Which element has the highest electron affinity among halogens?

A

Cl

86
Q

Which one of the following properties decreases across the third period of elements in the periodic table?

A

Ability to act as reducing agent

87
Q

In the 3rd period of the periodic table which of the following property is decreasing consistently?

A

Atomic Radius

88
Q

In the third period of elements, there lies of element “X” which is metallic in nature and it can reduce chlorine gas rapidly. To which group of elements does “X” belong:

A

IA

89
Q

THe hydration energy of Mg+2 is less than

A

Al+3

90
Q

Which alkaline earth metal makes peroxides?

A

Ba

91
Q

Lithium reacts with air to form:

A

➡Li2O
➡Li3N

92
Q

How many elements are there in the 3 period of periodic table?

A

8

93
Q

Which oxides of “K” contain more oxygen than is normal oxide?

A

Super Oxide

94
Q

Modern periodic table is arranged in acending order of:

A

Proton Number

95
Q

ionization energy decreases down the gorup from top to bottom due to;

A

Increase in shielding effect of the interveing electrons

96
Q

Oxidation number o aprticular element can be directly or indirectly inferred from its;

A

Group Number

97
Q

Potassiuum, Rubidium, Cesium reacts with oxygen to form which types of oxides?

A

Superoxides

98
Q

Magnesium reacts with nitrogen to form:

A

Mg3N2

99
Q

Densitites of alkali metals are low due to;

A

Large atomic volume

100
Q

Which of the following statements is incorrect?

A

➡Among halogens chlorine has maximum electron affinity❌
➡Along the period M.P and B.P increases upto IVA group❌
➡Among Be, B, C and N, the Be element has minimum ionization energy value✅
➡Cs is the most electropositive and F is the most electronegative element❌

101
Q

Which of the followign groups show abnormal trends in electron affinity values:

A

➡IIA
➡VA
➡VIIIA

102
Q

Shielding effect across a third period:

A

Remains same

103
Q

While moving down a group in the periodic table, which of the following would not be true:

A

➡All the atoms have the same number of valence electrons❌
➡Electronegativty decreases❌
➡Atomic size increases❌
➡Metallic character decreases and the basic nature of their oxides decreases✅

104
Q

Mark the correct statement:

A

Melting points of halogens increase down the group

105
Q

Electronic configuration of alkali metals is:

A

ns1

106
Q

Carbonate of ___ is least soluble in IA group.

A

Li2CO3

107
Q

One of the following will form superoxide when burnt in air

A

K

108
Q

Which among the alkali metals does not react with C2H2:

A

Li

109
Q

Which of the following compound is least soluble in water;

A

Mg(OH)2

110
Q

Which of the following show -1 oxidation state of in its oxides, formed by its reaction with O2 at 600°C

A

Ba

111
Q

On moving down the group in metals, reactivity of metals:

A

Increases

112
Q

M + O2 ➡MO2. The metal M is;

A

Ba

113
Q

The gas evolved when Ca reacts with boiling water is;

A

H2

114
Q

Which IIA metal will not form normal oxide in air at 600°C

A

Ba

115
Q

Which alkaline earth metal liberates hydrogen when treated with NaOh

A

Be

116
Q

Which one of the following metal of 3rd forms only peroxide when it reacts with O2;

A

Sodium

117
Q

Sodium and Magnesium form oxide with oxygen;

A

Basic Oxide

118
Q

Which one of the following from 3rd period doesn’t react with water

A

Ar

119
Q

The correct order of ionic radius is:

A

N-3>O-2>F-

120
Q

Select the correct option according to size:

A

➡Mg+ > Mg+2
➡Ca+ > Ca+2
➡Be+2 < Be+1

121
Q

Which atom has the smallest size?

A

He

122
Q

First electron affinity is maximum for:

A

Chlorine

123
Q

The relative attraction of the nucleus of an atom for the electrons in a chemical bond is:

A

Electronegativity

124
Q

Which of the following shows minimum electrical conductance:

A

Na

125
Q

Which ion is not formed in water:

A

➡H-
➡O-2

126
Q

Three elements A,B,C have consecutive proton numbers, if B is a noble gas, which of the following statement about these elements is not correct:

A

➡A can have variable oxidation states❌
➡A has high electron affinity whereas C has low ionization potential❌
➡A and C will form covalent bond with each other✅
➡A is a non-metal and C is a metal❌

127
Q

Which of the followings will have zero oxidation state?

A

VIIIA

128
Q

Which statement is incorrect?

A

➡All the metals are good conductor of electricity❌
➡All the metals are good conductor of heat❌
➡All the metals form positve ions❌
➡All the metals form acidic oxides✅

129
Q

Coinage metals of ____ group have extraordinary high values of electrical conductance

A

IB

130
Q

The elements placed in the extreme right periodic table are:

A

Non-Metals

131
Q

In alkali metal which one is a best conductor of electricity?

A

Cs

132
Q

Which of the following oxide is most basic among alkali metals.

A

K2O

133
Q

Ionization energy o group IA is minimum for:

A

Cs
(I.E decreases down the group)

134
Q

One of the followign is least reactive among following:

A

Li

135
Q

Lithium shows diagnol relationship with which of the following element

A

Mg

136
Q

Lithium is only Group IA metal which combines with nitrogen and carbon to fomr:

A

➡Lithium Nitride
➡Lithium Carbide

137
Q

Which oxide of IIA metal is most stable:

A

BeO

138
Q

Which oxide of IIA dissociate into ions in water, most easily:

A

BaO

139
Q

Which of the followings is not purely base:

A

BeO

140
Q

Reaction of alkaline earth metals with O2 is:

A

Oxidation

141
Q

Magnesium burns in air to form:

A

➡MgO
➡Mg3N2

142
Q

The elements of period 3rd react violently with water and make the solution

A

➡Alkaline
➡Acidic
➡Amphoteric

143
Q

Which of the following pair does not react directly with oxygen?

A

➡Cl
➡Ar

144
Q

Ionization energy depends upon:

A

➡Atoic/ionic radii
➡Electro to proton ratio
➡Shielding Effect

145
Q

2nd ionization energy of Mg is higher than the first because;

A

The nuclear pull for Mg+1 electrons is more than that of the Mg atom

146
Q

With the increasing atomic number, ionization energy increases over a period because:

A

➡ Non-change in shielding effect along a period
➡Nuclear pull increases with the increase in the number o protons
➡Atomic/ionic size decreases along a period

147
Q

Keeping in view the size of an atom, which statement is correct

A

Rb < Cs

148
Q

The correct order of electron affinity among halogens is:

A

Cl > Br > F > I

149
Q

In the same period, an element X belongs to the II-A group and another element Y belongs to the V-A group, marking the incorrect statement:

A

➡X is greater in atomic/ionic size compared to Y❌
➡Y has more free electrons as compared to X❌
➡Y is a good conductor as compared to X✅
➡X is surely a metal while Y might be a non-metal or a metalloid❌

150
Q

The electrical conductivity of the elements belonging to the s block is more than those located in the p block. This is because:

A

s- block elements have low ionization energies

151
Q

Transition metals show variable oxidation states because:

A

They have partially filled d-orbitals

152
Q

Melting points and boiling points increase along a period up to group IV-A and then decrease along the same period. This is because;

A

The number of valence electrons for bonding is maximum for IV-A elements

153
Q

The electron affinity value of chlorine is greater than fluorine because:

A

Fluorine is restricted to completing its octet and repelling upcoming electrons due to its small size

154
Q

The value of electron affinities for inert gases is likely to be:

A

Very Low

155
Q

Mark the correct order with respect to the melting/boiling points

A

➡Na > K
➡Kr > Ne
➡I > Br

156
Q

Mark the incorrect order of ionic radii:

A

➡Mg+2 > Be+2
➡F- > Cl-
➡K+ > Na+

157
Q

Which of the following correctly relates the correct order of atomic sizes

A

Ne < F < C < Be

158
Q

Which of the following cation has the smallest size:

A

Al+3

159
Q

The radius of iso-electronic cations ___ along the period

A

Decreases

160
Q

In the third period, the highest oxidation number shown by any of the elements is;

A

+7

161
Q

The electron affinity values generally increase from left to right period up to group number :

A

I to VII A

162
Q

Which of the following element reacts more vigorously with H2O:

A

Na

163
Q

The element that possesses the shortest atomic radius:

A

Oxygen

164
Q

The maximum first ionization energy is possessed by:

A

Cl

165
Q

Which one of the following has the highest ionization energy:

A

Helium

166
Q

The electron affinity of Beryllium is similar to:

A

He

167
Q

Identify the least stable ion amongst the following:

A

Be-

168
Q

Melting points o group IIa elements are considerably higher than those of group IA elements because:

A

II A provide more binding electrons

169
Q

Which of the following is a favourable factor for cation formation:

A

Low Ionization potential

170
Q

The addition of an electron in the valence shell of an isolated gaseous atom is the ____ process.

A

➡Exothermic
➡Endothermic

171
Q

The electron affinity depends upon:

A

➡Nuclear Charge
➡Atomic size
➡Shielding Effect

172
Q

Which of the following cannot exist in an aqueous solution:

A

O-2

173
Q

What is the trend of metallic character during the short periods:

A

Decrease from left to right

174
Q

Mark the correct statement;

A

➡Na+ is smaller than the Na atom
➡Cl- is smaller than the Cl atom
➡Na+ is larger than the Na atom

175
Q

Which one of the following has the lowest melting point

A

Mg

176
Q

Which of the following property remains constant along the period?

A

Shielding Effect

177
Q

A total number of elements in the 2nd period are:

A

8

178
Q

Which one is incorrect about Boron

A

➡It shows +3 and -3 oxidation states❌
➡It forms molecular addition compounds❌
➡Its compounds with large anions are unstable❌
➡It is a good metal✅

179
Q

Which one of the following is the smallest in size?

A

F-

180
Q

Considering the iso-electronic series, K+, S-2, Cl- and Ca+2, the radii of the ion decrease as:

A

S-2 > Cl- > K + > Ca+2

181
Q

In the oxygen family, which tendency works with an increase in atomic number?

A

Ionization energy decreases

182
Q

The property of an atom in a molecule to attract electrons towards itself is called:

A

Electronegativity

183
Q

Which of the following set of atoms are arranged in order of decreasing electronegativity?

A

F, O, N

CHEMISTRY (19 decks)

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