Chemistry
Assertion (A): Sulphuric acid acts as an oxidising agent.
Reason (R): Sulphuric acid produces hydrogen on reacting with zinc.
- 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.
Sulphuric Acid
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Answer
Both A and R are true but R is not the correct explanation of A.
Explanation— Sulphuric acid acts as an oxidising agent due to the fact that on thermal decomposition, it yields nascent oxygen [O]. This nascent oxygen oxidises non-metals, metals and inorganic compounds. Hence, the assertion (A) is true.
H2SO4 ⟶ 2H2O + SO2 + [O]
Dilute sulphuric acid reacts with metals like zinc, that is present above hydrogen in the activity series to form metallic sulphate and hydrogen at ordinary temperature. Hence, the reason (R) is true.
Zn + H2SO4 ⟶ ZnSO4 + H2 ↑
But, reason (R) doesn't explain the reason behind oxidising property of sulphuric acid. Hence, reason (R) is not the correct explanation of assertion (A).
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Following are the typical properties of dilute acid. Complete them by inserting suitable words:
(i) Active metal + acid ⟶ …………… + ……………
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(iv) Sulphite/hydrogen sulphite + Acid ⟶ …………… + ……………
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(b) The gas released when sodium carbonate is added to a solution of sulphur dioxide.
(c) Liquid E can be dehydrated to produce ethene.
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(i) The acid on mixing with lead nitrate solution produces white ppt. which is insoluble even on heating.