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s-Block Elements · Question 37

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

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.

⇒ Extent of hydration: Li+ > Na+ > K+ > Rb+

⇒ Hydrated ionic radius: Li+ > Na+ > K+ > Rb+

∵ A larger hydrated ion moves more slowly in solution,

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

Answer: (1)

Out of syllabusAIPMT 2006

Keep practising — s-Block Elements

2

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
3

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
4

Mg is present in

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

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