Question

Which of the following statements is false?

A. Radon is obtained from the decay of radium
B. Helium is inert gas
C. Xenon is the most reactive among the rare gases
D. The most abundant rare gas found in the atmosphere is helium  
Answer :   The most abundant rare gas found in the atmosphere is helium
Solution :
The amount of noble gases present in atmosphere ( in percent by ) is given below :
Element Abundance (volume%)
$$He$$ $$524 \times {10^{ - 4}}$$
$$Ne$$ $$1.82 \times {10^{ - 3}}$$
$$Ar$$ $$0.934$$
$$Kr$$ $$1.14 \times {10^{ - 3}}$$
$$Xe$$ $$8.7 \times {10^{ - 6}}$$

So, argon is most abundant, not helium.

Releted MCQ Question on
Inorganic Chemistry >> P - Block Elements

Releted Question 1

The reddish brown coloured gas formed when nitric oxide is oxidised by air is

A. $${N_2}{O_5}$$
B. $${N_2}{O_4}$$
C. $$N{O_2}$$
D. $${N_2}{O_3}$$
Releted Question 2

The temporary hardness of water due to calcium carbonate can be removed by adding —

A. $$CaC{O_3}$$
B. $$Ca{\left( {OH} \right)_2}\,$$
C. $$CaC{l_2}$$
D. $$\,HCl$$
Releted Question 3

Which of the following is most stable to heat

A. $$HCl$$
B. $$HOCl$$
C. $$HBr$$
D. $$HI$$
Releted Question 4

White $$P$$ reacts with caustic soda. The products are $$P{H_3}$$ and $$Na{H_2}P{O_2}.$$   This reaction is an example of

A. Oxidation
B. Reduction
C. oxidation and reduction
D. Neutralisation

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P - Block Elements


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