Chemistry
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
Nitric Acid
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Answer
Only R
Reason — On heating zinc nitrate, the products formed are zinc oxide, nitrogen dioxide and oxygen. Zinc oxide is yellow when hot, white when cold.
2Zn(NO3)2 2ZnO + 4NO2 + O2
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Related Questions
HNO3 is kept in reagent bottles because it is :
- an oxidising agent
- a reducing agent
- hygroscopic in nature
- decompose in the presence of light
The nitrate which does not leave any residue behind on heating is :
- NaNO3
- NH4NO3
- AgNO3
- Ca(NO3)2
Assertion (A): KNO3 and conc. H2SO4 are the reactants for the preparation of nitric acid.
Reason (R): Conc. H2SO4 being a non volatile acid is required to prepare volatile acids.
- 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.
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.