Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?
A
K
B
Rb
C
Li
D
Na
Explanation
Li+ being smallest, has maximum charge
density.
So, Li+ is most heavily hydrated among all alkali
metal ions. Effective size of Li+ in aqueous
solution is therefore, largest. So, moves slowest
under electric field.
2
MCQ (Single Correct Answer)
NEET 2016 Phase 1
Which of the following statments is false?
A
Ca2+ ions are not important in maintaining the regular beating of the heart.
B
Mg2+ ions are important in the green parts of the plants.
C
Mg2+ ions form a complex with ATP.
D
Ca2+ ions are important in blood clotting.
Explanation
Ca2+ ions are required to trigger the
contraction of muscles and to maintain the regular
beating of the heart.
3
MCQ (Single Correct Answer)
NEET 2016 Phase 1
The product obtained as a result of a reaction of nitrogen with CaC2 is
A
CaCN2
B
Ca2CN
C
Ca(CN)2
D
CaCN
Explanation
CaC2 + N2 $$ \to $$ CaCN2 + C
4
MCQ (Single Correct Answer)
NEET 2016 Phase 2
In context with beryllium, which one of the following statements is incorrect?
A
It is rendered passive by nitric acid.
B
It forms Be2C
C
Its salts rarely hydrolyze.
D
Its hydride is electron-deficient and polymeric.
Explanation
Beryllium salts are readily hydrolysed.
Questions Asked from s-Block Elements
On those following papers in MCQ (Single Correct Answer) Number in Brackets after Paper Name Indicates No of Questions