JEE Main 2021 Question Paper (20-Jul-2021) (Shift 2)

Question 1

Which one of the following pairs of isomers is an example of metamerism?

Accepted Answer

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Answer

Answer

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Question 2

In the above reactions, product A and product B respectively are:

Accepted Answer

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Answer

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Question 3

The major product (P) in the following reaction is:

Accepted Answer

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Answer

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Question 4

The single largest industrial application of dihydrogen is:

Accepted Answer

In the synthesis of ammonia

Answer

Manufacture of metal hydrides

Answer

Rocket fuel in space research

Answer

In the synthesis of nitric acid

Question 5

Consider two chemical reactions (A) and (B) that
take place during metallurgical process:
(A) \[ \mathrm{ZnCO}_{3\left(\mathrm{s}\right)} \xrightarrow{\Delta} \mathrm{ZnO}_{\left(\mathrm{s}\right)} + \mathrm{CO}_{2\left(\mathrm{g}\right)} \]
(B) \[ 2\mathrm{ZnS}_{\left(\mathrm{s}\right)} + 3\mathrm{O}_{2\left(\mathrm{g}\right)} \xrightarrow{\Delta} 2\mathrm{ZnO}_{\left(\mathrm{s}\right)} + 2\mathrm{SO}_{2\left(\mathrm{g}\right)} \]
The correct option of names given to them respectively is:

Accepted Answer

(A) is calcination and (B) is roasting

Answer

Both (A) and (B) are producing the same product, so both are roasting.

Answer

Both (A) and (B) are producing the same product, so both are calcination.

Answer

(A) is roasting and (B) is calcination