The correct order of the mobility of the alkali metal ions in aqueous solution is
A
Rb+ > K+ > Na+ > Li+
B
Li+ > Na+ > K+ > Rb+
C
Na+ > K+ > Rb+ > Li+
D
K+ > Rb+ > Na+ > Li+
Explanation
Ionic radii of alkali metals in water follows
the order Li+ > Na+ > K+ > Rb+ > Cs+
Thus in aqueous solution due to larger ionic
radius Li+ has lowest mobility and hence the
correct order of ionic mobility is
Rb+ > K+ > Na+ > Li+
2
AIPMT 2004
MCQ (Single Correct Answer)
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
A
Ca(HCO3)2
B
CaCO3
C
Na2CO3
D
K2CO3
Explanation
The given compound X must be CaCO3.
3
AIPMT 2002
MCQ (Single Correct Answer)
In which of the following processes, fused sodium hydroxide is electrolysed at a 330oC temperature for extraction of sodium?
A
Castner's process
B
Down's process
C
Cyanide process
D
Both 'b' and 'c'
Explanation
In Castner’s process, for production of
sodium metal, sodium hydroxide (NaOH) is
electrolysed at temperature 330ºC.
Questions Asked from s-Block Elements
On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
