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Q.

When a substance A reacts with water, it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner: A, B, C and D respectively are

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a

Na, H2, NaOH, Zn

b

K, H2, KOH, Al

c

Ca, H2, CaOH2, Sn

d

CaC2, C2H2, CaOH2, Fe

answer is A.

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Detailed Solution

2Na(s) + 2H2O(l)  →  2NaOH(aq) + H2(g) (A)                  (C)                                     (B)         Zn(s) + 2NaOH(aq)  →  Na2ZnO2 + H2(B) (D)                                                                Zn(s) +  H2SO4(aq)   →Room  temperature  ZnSO4(aq)  +   H2(B) (D) Na  →Burn on nonlumionous flame  Golden yellow flame
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When a substance A reacts with water, it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner: A, B, C and D respectively are