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NEET2010Chemistrys Block ElementsActual

The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B . Excess of CO ₂ is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid C on gentle heating gives back A . The compound A is

Options

  1. ACaCO ₃
  2. BNa ₂ CO ₃
  3. CK ₂ CO ₃
  4. DCaSO ₄ 2 H ₂ O

Correct answer

A. CaCO ₃

Step-by-step solution

Thus, the compound ' A ' must be CaCO ₃ and the reactions are as follows

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