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     EduGorilla 
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    When a substance A reacts with H2O, it produces a combustible gas B and solution of 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 the same gas B on reaction with dil. H2SO4 at room temperature. A imparts golden yellow colour to Bunsen flame. A, B, C and D respectively are

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    1. CaC2, C2H2, Ca(OH)2 and Fe

    2. Ca, H2, Ca (OH)2 and Sn

    3. K, H2, KOH and Al

    4. Na, H2, NaOH and Zn

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