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s-Block Elements · Question 36

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

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 syllabusAIPMT 2007

Keep practising — s-Block Elements

2

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 syllabusAIPMT 2006
3

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 syllabusAIPMT 2004
4

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 syllabusAIPMT 2002
5

Mg is present in

  1. chlorophyll
  2. haemoglobin
  3. vitamin-D
  4. vitamin-B
AIPMT 2000

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