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Calcium burns in nitrogen to produce a white powder which dissolve in sufficient water to produce a gas (A) and an alkaline solution. The solution on exposure to air produces a thin solid layer of (B) on the surface. Identify the compounds A and B. 

(A) C2H2, CaCO

(B) NH3, CaCO

(C) NH3, Ca(OH)

(D) CH4, CaCO3

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Best answer

Correct Option (B) NH3, CaCO3

Explanation:

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