p block Flashcards by Unknown Unknown

Q

oxygen % in earth crust

A

56.6%

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Q

silicon % in crust

A

27.7%

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Q

most abundant metalloid in earth crust is

A

silicon

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Q

most abundant metal in earth’s crust is

A

aluminium

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Q

% of aluminum in earth crust

A

8.3%

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Q

borax is found in

A

puga valley in ladakh, sambhar lake in rajasthan

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Q

borax formula is

A

na2b4o7

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Q

boron %

A

10^-4%

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Q

bauxite formula is

A

al2o3

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Q

order of size of atom in 13 group

A

B<Ga<Al<In<Tl

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Q

order of ionisation enthalpy of group 13

A

B>Tl>Ga>Al>In

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Q

order of electron gain enthalpy of group 13

A

B>AL>GA>IN>TL

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Q

order of boiling point of group 13

A

b>al>ga>in>tl

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Q

order of melting point of group 13

A

b>al>tl>in>ga

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Q

ionisation enthalpy of group 14 is in order

A

c>si>ge>pb>sn

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Q

electron gain enthalpy of group 16

A

s>se>te>o

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Q

electron gain enthalpy of group 18

A

ne>ar=kr>xe>rn>o

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Q

n2o5 is

A

acidic

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Q

no and no2 are

A

neutral

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Q

____ is predominantly acidic

A

GeO

Q

_____ boron reacts with air

A

amorphous

Q

p2o5 is used as

A

dehydrating agent

Q

so2 is a ____ agent

A

reducing

Q

o3 is a _____ agent

A

reducing

Q

stability of oxides of halogens is

A

I>CL>BR

Q

_____ is used in purification of CO

A

I2O5

Q

order of melting point of group 15 hydrides

A

NH3>SBH3>ASH3>PH3

Q

Order of boiling point of group 15 hydrides is

A

BSNAP

Q

order of basicity of group 15 hydride

A

NH3>PH3>ASH3>SBH3>BIH3

Q

order of melting point of group 16 hydrides

A

O>Te>Se>S

Q

order of acidity of group 16 hydrides

A

H2O<H2S<H2Se<H2TE

Q

order of reducing character of group 16 hydrides

A

H2O<H2S<H2SE<H2TE

Q

order of reducing character of group 15 hydrides

A

NH3<PH3<ASH3<SBH3<BIH3

Q

Order of boiling point of group 17 hydrides

A

FIBC

Q

Order of melting point of group 17 hydrides

A

IFBC

Q

which group 13 trihalide is not formed

A

TlI3

Q

which halide does not undergo hydrolysis

A

CCl4

Q

SiCl4+ h2o —->

A

Si(OH)4 silicic acid

Q

bif3 is _____ (ionic/covalent)

A

covalent

Q

pbf4 is _____(ionic/covalent)

A

ionic

Q

fullerene has ____ 5 membered chains and _____ 6 membered

A

12-5 and 20-6

Q

which does not show catenation

A

Pb

Q

monohalides of group 16 are

A

dimeric

Q

Cl2o is a

A

reducing agent

Q

____ oxidises nuclear fuel (puf2)

A

o2f2

Q

shape of xeo3

A

pyramidal

Q

shape of xeof4 is

A

square pyramidal

Q

boiling point of group 15 is

A

N>P>AS>BI>SB

Q

melting point of group 15 is

A

N>P>SB>BI>AS