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s-Block Elements

AIPMT 2006MCQMedium📈 Topic in 25% papers+4−1
Ques. 1AIPMT 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+

Answer

(1) Rb+ > K+ > Na+ > Li+

Solution

As per NCERT, the alkali metal ions are highly hydrated, and the smaller the ion, the greater its extent of hydration.

So the extent of hydration is Li+ > Na+ > K+ > Rb+, and the hydrated ionic radius follows the same order, Li+ > Na+ > K+ > Rb+.

A larger hydrated ion moves more slowly in solution, the mobility order is reversed.

∴ Ionic mobility: Rb+ > K+ > Na+ > Li+

Answer: (1)

Out of syllabus

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Ques. 2AIPMT 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. 3AIPMT 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. 4AIPMT 2000

Mg is present in

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

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