1
MCQ (Single Correct Answer)

NEET 2017

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.

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