Question

a green coloured solid X on heating produces a black residue Y and a colourless gas X which when passed through clear lime water turns it milky..Identify X Y Z and write a balanced chemical equation to show the thermal decomposition of X​

Answer 1

Answer:

The Gas formed on heating limestone is Carbon dioxide. When this gas is passed through lime water, it forms Calcium Carbonate or limestone which turns milky.

Reaction for the above is-

When Limestone is heated,

    CaCO3→CaO+CO2.

    (limestone)

When Carbon Dioxide is passed through lime water,

   CO2+Ca(OH)2→CaCO3↓+H₂O.

               (lime water)

Reason :

When Carbon dioxide is passed through Lime water or Calcium Hydroxide, it turns milky due to the formation of the Precipitate of the insoluble milky Calcium Carbonate.

Explanation:

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Answer 2

Answer:

Explanation:

A→Δ  colourless + Residue

Residue + water →B

B(eq.)+aqofCO2→ (solid)

C→ΔA

Colorless gas →CO2 therefore A is CaCO3

CaCO3→ΔCO2+CaO

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