1
MCQ (Single Correct Answer)

AIPMT 2010 Prelims

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.
2
MCQ (Single Correct Answer)

AIPMT 2009

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.
3
MCQ (Single Correct Answer)

AIPMT 2009

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
4
MCQ (Single Correct Answer)

AIPMT 2008

The sequence of ionic mobility in aqueous solution is
A
Rb+ > K+ > Cs+ > Na+
B
Na+ > K+ > Rb+ > Cs+
C
K+ > Na+ > Rb+ > Cs+
D
Cs+ > Rb+ > K+ > Na+

Explanation

Smaller the size of an ion, greater will be the degree of hydration. So, degree of hydration is highest for Li+ and that is smallest for Cs+. Therefore, Li+ holds the water molecules in its hydration sphere and Cs+ ion holds the least water molecules.

Hence, the correct ionic mobility in aqueous medium is :

Cs+ > Rb+ > K+ > Na+

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