Mistakes Flashcards
Fugacity of a leaving group depends upon
The basicity of the leaving group.
If the leaving group forms a weak base, it is more fugative.
How many chiral atoms does lactic acid have?
1
Alkylation of morphine gives
Heroin
Acetylation of morphine gives
Codeine
Which flouride of xenon cannot be stored in glass vessels?
XeF6
Which chloride of mercury gives a black precipitate on reaction with NH4OH?
Hg2Cl2
Which chloride of mercury gives a white precipitate on reaction with NH4OH and red precipitate with KOH?
HgCl2
What is obtained as product when phenol reacts with pyrimidine?
Phenoxide ion
The distance between an octahedral and tetrahedral void in fcc lattice would be
√(3)/4
For a reaction A + B —> C + 60 kJ
if forwards activation energy is 40 kJ/mol then activation energy of backward reaction will be
100kJ
Is tetracarbonylnickel (0) paramagnetic or diamagnetic?
Diamagnetic
Is tetrachloronickel (II) paramagnetic or diamagnetic?
Paramagnetic
How many geometrical isomers does the following have?
[Pt(NH3)(NH2OH)(H2O)(Py)]
3
Which oxide of nitrogen is called a mixed anhydride and why?
H2O + 2 NO2 ⇄ HNO3 + HNO2
Mixed anhydride are the compound that react with water to form a mixture of two acidic anhydride. So NO2 is a mixed anhydride.
Is gadolinium a lanthanide or actinide?
Lanthanide
WHen temporary hard water containing Mg(HCO3)2 is boiled the ppt. formed is of
Mg(OH)2
Is acetic acid a stronger acid in water or in NH3?
In NH3, because NH3 is a stronger base.
concept of acid and base is relative, so in a stronger base it acts as a stronger acid
What is the arrangement of electron gain enthalpy (with negative sign) in increasing order for O, Cl, F and S?
O
Cisplatin is in organometallic compound. True/false?
False.
It is a coordination compound.
Which is the most thermodynamically stable allotrope of phosphorus?
Black phosphorus
Which carbonate among the carbonated of second group is the least stable?
BeCO3
What is the correct increasing order of ionic radii of Y3+, La3+, Eu3+ and Lu3+?
Y3+ < Lu3+ < Eu3+
Sodium is made by the electrolysis of molten mixture of about 30% NaCl and 60% CaCl2. Why?
This mixture as a lower melting point than pure NaCl
Heating primary alcohol in H2SO4 at 443K gives
Alkene
Heating primary alcohol in H2SO4 at 410K gives
Ether
What is hydrolith?
Calcium hydride
What type of bonds are present in beryllium hydroxide and magnesium hydride?
Banana bonds (polymeric compounds)
What kind of deviation does the azeotropic mixture of water and ethanol which show a lower boiling point than both the individual solutions show?
Positive deviation
Which compound is obtained on dissolving metallic zinc in excess of Naoh
Na2ZnO2
What products are obtained on decomposition of AgNO3?
Silver, oxygen and Nitrogen dioxide
Which products are obtained on decomposition of NH4NO3?
N2O and water
Which products are obtained on decomposition of LiNO3?
lithium oxide (Li2O), oxygen (O2) and nitrogen dioxide (NO2)
At high pressure all real gases have Z>1 while at moderate pressure most gases have Z<1. True/false?
True
Vanderwaal constant ‘a’ is a measure of attractive forces within the gas and is independent of temperature and pressure. True/false?
True
Greater the critical temperature of a gas, less easily it will be liquified. True/false?
False. Greater the critical temperature of a gas, more easily it will be liquified.
What is the critical temperature of a gas?
The critical temperature of a gas is that temperature above which it cannot be liquefied by pressure.
In the extraction of which metal is poling used?
Copper
What is the correct order of basic strength of NiO, K2O, MgO and Cs2O?
NiO
What is the correct order of solubility of Na2Co3, K2Co3 and Li2Co3?
Li2Co3
What is the correct order of thermal stability of NH3, PH3 and AsH3?
NH3>PH3>AsH3
What is the expression relating radius of cation, anion and side of unit cell in expressions is correct in case of CsCl unit cell?
R(cation) +R(anion) = √3a/2
Which is more acidic- formic acid or 3-chloropropanoic acid?
Formic acid
Which is more acidic- alcohol or alkyne?
Alcohol
Is cyclooctatetraene anti-aromatic?
No, because it is non planar.
How many gaseous products are formed when any lanthanoid reacts with oxygen, acid, sulphur, halogen, nitrogen, carbon or water?
2
Hydrogen gas is formed in the case of acids and water
What is formed by the decomposition of Fe2(SO4)3?
Fe2O3 and SO2
According to Schrodinger model, nature of electron in an atom is
Wave
What is poling in metallurgy?
Reduction of oxides of impurities during refining of metal using hydrocarbons (green logs of wood).
Which monomers are better for chain growth polymerisation?
The ones which can form stable carbocations.
What is the correct order of acidic strength of HClO, HIO and HBrO?
HClO > HBrO > HIO
What is the correct order of acidic strength of H3PO2, H3PO4, H3PO3?
H3PO2 > H3PO3 > H3PO4
For non-ideal solution showing negative deviation from ideal behaviour what is the sign of change in entropy?
ΔS > 0
Which ion is more stable in aqueous medium- Cr3+ or Mn3+?
Cr3+
Number of degenerate orbitals present in 3rd shell of Li2+ ion is
9
Which has higher value of Kb (Ionization constant of base): p-methoxyaniline or p-methylaniline?
p-methoxyaniline
What type of magnetic substance is Fe3O4?
Ferrimagnetic
Which is the least stable metal carboxyl among the following?
V(CO)6, [Co2(CO)8], [Mn2(CO)10], Cr(CO)6
V(CO)6
Consider the following reaction at equilibrium
N2(g) + 3H2(g) —> 2NH3(g)
If helium gas is introduced to the above equilibrium at constant pressure then
Reaction proceeds backward
Why does reaction proceed towards the direction of more number of atoms when inert gas is added at constant pressure in a reaction mixture?
When an inert gas is added to the system in equilibrium at constant pressure, then the total volume will increase. Hence, molarity of reactants and products will decrease. The equilibrium will shift towards the direction in which there is increase in number of moles of gases.
Is the dielectric constant of H2O more orD2O?
H2O
What type of isomers are Isobutyl alcohol and tertiary butyl alcohol?
Position isomers
The distance between nearest tetrahedral voids of CCP unit cell is
a/2
What are extensive properties?
an extensive quantity is one whose magnitude is dependent on mass
What are intensive properties?
Intensive properties are independent of the mass of system.
Is gold sol positively or negatively charged?
Negatively charged
For hydrolysis of the following functional groups, the decreasing order of reactivity is
RCOOR RCOCI RCONH2
RCOCI > RCOOR > RCONH2
If ΔU° for combustion of methane is – x kJ mol–1, then the value of ΔH° is
< -x kJ mol-1
Is Fe(OH)3 sol negatively charged?
No, it is positively charged.
During the process C2 the electron has been added to which of the following molecular orbital?
Sigma z
Are all the bond lengths the same in SF6?
yes
O–O bond length in gas phase is more than that in solid phase. True/false?
True.
O–H bond length in gas phase is more than that in solid phase. True/false?
False. O–H bond length in solid phase is more than that in gas phase.
4HCl + O2 ————–> 2Cl2 + 2H2O.
The above reaction is catalysed by
Cupric chloride
When borax is heated in a Bunsen burner flame with CoO on a loop of platinum wire, a compound A is formed. The colour and formula of the compound A is
Blue and Co(BO2)2
The maximum limit of Nitrate ion in drinking water is
50 ppm
On treating Na2S with sodium nitroprusside, a violet coloured compound is formed. The formula of compound is:
Na4[Fe(CN)5NOS]
“Metals are usually not found as nitrates in their ores”.
Out of the following two (a and b) reasons which is/are true for the above observation?
(a) Metal nitrates are highly unstable.
(b) Metal nitrates are highly soluble in water.
A is false, but B is true
The electrolytic reduction of nitrobenzene in strongly acidic medium produces
p–Aminophenol
Treatment of cyclopentanone with methyl lithium gives which of the following species?
Cyclopentanonyl anion
