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s-Block Elements

AIPMT 2007MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2007

In which of the following the hydration energy is higher than the lattice energy?

  1. MgSO4
  2. RaSO4
  3. SrSO4
  4. BaSO4

Answer

(1) MgSO4

Solution

A salt is soluble in water when its hydration energy is greater than its lattice energy.

As per NCERT, the solubility of alkaline earth metal sulphates decreases down the group: BeSO4 and MgSO4 are readily soluble, while CaSO4, SrSO4, BaSO4 and RaSO4 are sparingly soluble.

∵ The lattice energy of the sulphates (large anion) changes little down the group, but the hydration energy falls sharply as the cation size increases.

⇒ Only for the small Mg2+ ion does the hydration energy exceed the lattice energy.

∴ MgSO4 is the required salt.

Answer: (1)

Out of syllabus

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Ques. 2AIPMT 2006

The correct order of the mobility of the alkali metal ions in aqueous solution is

  1. Rb+ > K+ > Na+ > Li+
  2. Li+ > Na+ > K+ > Rb+
  3. Na+ > K+ > Rb+ > Li+
  4. K+ > Rb+ > Na+ > Li+
Out of syllabus
Ques. 3AIPMT 2004

A solid compound X on heating gives CO2 gas and a residue. The residue mixed with water forms Y. On passing an excess of CO2 through Y in water, a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is

  1. Ca(HCO3)2
  2. CaCO3
  3. Na2CO3
  4. K2CO3
Out of syllabus
Ques. 4AIPMT 2002

In which of the following processes, fused sodium hydroxide is electrolysed at a temperature of 330 C for extraction of sodium?

  1. Castner's process
  2. Downs process
  3. Cyanide process
  4. Both (2) and (3)
Out of syllabus
Ques. 5AIPMT 2000

Mg is present in

  1. chlorophyll
  2. haemoglobin
  3. vitamin-D
  4. vitamin-B

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