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1

AIPMT 2010 Prelims

MCQ (Single Correct Answer)
Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?
A
CaSO4
B
BeSO4
C
BaSO4
D
SrSO4

Explanation

The hydration enthalpy of BeSO4 is higher than its lattice energy. Within group 2, the hydration energy decreases down the group while lattice energy is almost the same.
2

AIPMT 2010 Prelims

MCQ (Single Correct Answer)
Property of the alkaline earth metals that increases with their atomic number
A
solubility of their hydroxides in water
B
solubility of their sulphates in water
C
ionization energy
D
electronegativity

Explanation

On moving down the group, basic nature of these hydroxides increases due to low ionization enthalpies because M-O bond in MOH is weak and thus break to give OH ions in the solution.
3

AIPMT 2009

MCQ (Single Correct Answer)
Which of the following oxides is not expected to react with sodium hydroxide?
A
CaO
B
SiO2
C
BeO
D
B2O3

Explanation

NaOH is a strong alkali. It combines with acidic and amphoteric oxides to form salts. Since CaO is a basic oxide hence does not reacts with NaOH.
4

AIPMT 2009

MCQ (Single Correct Answer)
In the case of alkali metals, the covalent character decreases in the order
A
MF > MCl > MBr > MI
B
MF > MCl > MI > MBr
C
MI > MBr > MCl > MF
D
MCl > MI > MBr > MF

Explanation

According to Fajans’ rule,

Covalent character $$ \propto $$ size of anion $$ \propto $$
1
size of cation
.

Now the order of size of anions in the given options is as follows

F < Cl < Br < I

Thus, the covalent character of the given compounds varies as

MI > MBr > MCl > MF

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