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

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

  1. A

    Na, H2, NaOH, Zn

  2. B

    K, H2, KOH, Al

  3. C

    Ca, H2, CaOH2, Sn

  4. D

    CaC2, C2H2, CaOH2, Fe

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    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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