Small pieces of different metals P, Q, R and S are dropped in beakers containing different regents.
Identify the metals P, Q, R and S respectively.

Zn, Mg, Ca, Cu

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Na, Cu, Mg, Ca

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Mg, Ca, Zn, Na

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Zn, Ca, Na, Mg

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Solution

The correct option is D Zn, Mg, Ca, Cu
1. Zinc in water causes milky turbidity because of formation of zinc hydroxide layer.
2. Magnesium dissolves in $H C l$ to form magnesium chloride and hydrogen gas is liberated.
3. Elementary calcium reacts with water at room temperature and it forms calcium hydroxide and hydrogen gas.
4. Copper metal does not dissolve in dil $H C l$ as it is unreactive.

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