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One mole of a substance (A) on reacting with excess of water, gives two mole of readily combustible gas and an alkanline solution. The alkaline solution gives white turbidity with (CO2). The substance (A) is

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(A) CaH2

(B) NaH

(C) Ca(OH)2

(D) NaNO3

Ans. A

Sol. CaH2 + 2H2O Ca(OH)2 + 2H2. Calcium hydroxide produces white turbidity by passing CO2.

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