Chemistry
Assertion (A): Concentrated sulphuric acid is kept in air tight bottles.
Reason (R): Air contains impurities, therefore H2SO4 will get spoiled.
- 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
A is true but R is false.
Explanation— As concentrated sulphuric acid is hygroscopic and has a great affinity for water hence, it absorbs moisture from the atmosphere. Therefore, it is kept in air tight bottles. Hence, the assertion (A) is true.
The main concern to keep sulphuric acid in air tight bottles is to avoid moisture from entering, not impurities. Impurities in air do not significantly affect concentrated sulphuric acid. Hence, the reason (R) is false.
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Match the following :
Some properties of sulphuric acid are listed below. Choose the property a, b, c or d which is responsible for the reactions (i) to (v). Some properties may be repeated:
Column I
a. Typical acid
b. Dehydrating agent
c. Non-volatile acid
d. Oxidising agent
Column II
(i) C12H22O11 + nH2SO4 ⟶ 12C + 11H2O + nH2SO4
(ii) NaCl + H2SO4 ⟶ NaHSO4 + HCl
(iii) CuO + H2SO4 ⟶ CuSO4 + H2O
(iv) Na2CO3 + H2SO4 ⟶ Na2SO4 + H2O + CO2