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प्रश्न
Assertion (A): Hydrogen gas is liberated when metals like Zn, Al, Pb react with caustic alkalies.
Reason (R): Alkalies are soluble in water.
विकल्प
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.
MCQ
अभिकथन और तर्क
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उत्तर
Both A and R are true but R is not the correct explanation of A.
Explanation:
Zinc, aluminium and lead react with caustic alkalis to form soluble salts and liberate hydrogen, so A is true. Although alkalis are soluble in water, this does not explain the hydrogen-producing reaction; therefore, R is true but not the correct explanation.
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