Chemistry
Assertion (A): V2O5 or Pt is used in the catalytic oxidation of sulphur dioxide
Reason (R): The catalytic oxidation of SO2 is an exothermic reaction, so it requires to be heated to about 450°C only in the beginning.
- 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.
Answer
Both A and R are true but R is not the correct explanation of A.
Explanation— In the catalytic oxidation of sulphur dioxide, vanadium pentoxide (V2O5) or platinum (Pt) is used as a catalyst. Hence, the assertion (A) is true.
The catalytic oxidation of sulphur dioxide is highly exothermic, the catalyst is heated only in the beginning to about 450°C. This temperature is maintained by the heat evolved during the reaction. Hence, the reason (R) is true.
Reason (R) doesn't explain why V2O5 or Pt is used as the catalyst. Hence, reason (R) is not the correct explanation of assertion (A).
Related Questions
The compound formed by the oxidation of sulphur by nitric acid is :
P — Sulphuric acid
Q — Nitrogen dioxide
R — Sulphur dioxide
- Only P
- Only Q
- Only R
- Both P and Q
Assertion (A): Sulphuric acid is known as the oil of vitriol.
Reason (R): Sulphuric acid was first obtained by heating crystals of green vitriol.
- 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): Sulphuric acid when dissolved in water forms a basic salt
Reason (R): Sulphuric acid ionises in two stages, it is a dibasic acid.
- 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): Pure sulphuric acid is almost a non-conductor of electricity.
Reason (R): Dilute sulphuric acid is a good conductor of electricity.
- 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.