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When a substance 'A' reacts with water it produces combustible gas B and a solution of a substance 'C' in water. A has no recation with the solution of 'C'. When another substance 'D' reacts with this solution of 'C' it also produces the same gas 'B' even on reaction with dilute sulphuric acid at room temperature. Here A, B, C & D are respectively.

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a

Na, H2, NaOH and Zn

b

K, H2, KOH and Na

c

Ca, O2, Ca(OH)2 and Sn

d

Cal2, C2H2, Ca(OH)2 and Fe

answer is A.

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When a substance 'A' reacts with water it produces combustible gas B and a solution of a substance 'C' in water. A has no recation with the solution of 'C'. When another substance 'D' reacts with this solution of 'C' it also produces the same gas 'B' even on reaction with dilute sulphuric acid at room temperature. Here A, B, C & D are respectively.