State one appropriate observation for each of the following. Copper sulphide is treated with dilute hydrochloric acid.

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Solution

The black coloured copper sulphite turns blue and hydrogen sulphide gas is liberated.
$C u S + d i l . H C l \to C u C l_{2} + H_{2} S$

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State one appropriate observation for each of the following. Copper sulphide is treated with dilute hydrochloric acid.

The black coloured copper sulphite turns blue and hydrogen sulphide gas is liberated.CuS+dil.HCl→CuCl2+H2S

The black coloured copper sulphite turns blue and hydrogen sulphide gas is liberated.
$C u S + d i l . H C l \to C u C l_{2} + H_{2} S$