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Question

Match the following reactions with the changes observed during each of them.

A
Change in colour
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B
Gas is evolved
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C
Formation of ppt
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Solution

Copper sulphate solution is blue in colour. When powdered zinc is added to it, the solution turns colourless due to the formation of zinc sulphate solution.
Here, the reaction is:
CuSO4(aq) + Zn(s) ZnSO4(aq) + Cu(s)

Iron reacts with hydrochloric acid to form ferrous chloride and releases hydrogen gas.
Fe (s)+2HCl (aq)FeCl2(aq)+H2(g)

The reaction between silver nitrate and sodium chloride is a precipitation reaction in which an insoluble precipitate of silver chloride is formed.
AgNO3(aq)+NaCl (aq) NaNO3(aq) +AgCl(s)

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