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When a solid B was heated in a test-tube, it gave off two gases. The two gases were separated by passing them through a plug of glass wool in a test-tube as shown below.
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The first gas which evolved turned moist red litmus paper to blue. Later the other gas involved turned the litmus back to red.

  1. Identify solid B 
  2. Write the equation for the reaction that take place in the test tube

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  1. Identify solid B 
    Ammonium Carbonate
  2. Write the equation for the reaction that take place in the test tube 
    (NH4)2 CO3(S) → 2NH3(g) + CO2(g) + H2O(l)

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