Chemistry
Assertion (A): Nitric acid prepared in the laboratory is yellow in colour.
Reason (R): Brown gas is used in its preparation.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Nitric Acid
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Answer
A is true but R is false.
Explanation— Pure nitric acid is colourless but the acid obtained in the laboratory is slightly yellow. The yellow colour is due to dissolution of reddish brown coloured nitrogen dioxide gas in the acid. This gas is produced due to the thermal decomposition of a portion of nitric acid. Hence, the assertion (A) is true.
Brown gas is not used in nitric acid preparation but brown coloured nitrogen dioxide gas is produced due to the thermal decomposition of portion of nitric acid. Hence, the reason (R) is false.
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Related Questions
On heating zinc nitrate, the products formed are zinc oxide, nitrogen dioxide and oxygen. Zinc oxide is :
P — a black solid
Q — brown when hot, yellow when cold
R — yellow when hot, white when cold
Which of the following is true ?
- Only P
- Only Q
- Only R
- Both Q and R
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Reason (R): Conc. H2SO4 being a non volatile acid is required to prepare volatile acids.
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Reason (R): Catalytic oxidation of ammonia is an endothermic process.
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- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
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Reason (R): Carbon dioxide gas or dry air drives away NO2 gas from the warm nitric acid.
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