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Preparation of Hydrogen

A student was...

Question

A student was given Mg, Zn, Fe and Cu metals. He puts each of them in dil.HCl contained in different test tubes. Identify which of them will not displace $H_{2}$ from dil. HCl?

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Solution

Since copper is less reactive than that of hydrogen, thus it will not displace $H_{2}$ from dil $H C l$ .

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Q. Abhinav a class 9 student arranged the given setup to study the reactivity of some metals with water .he summerised his observations as follows:

1.In test tube p,there was no reaction in cold water but when th etest tube was heated for a while bubles of gas was seen.
2.In test tube Q,bubbles of gas were formed only after boiling the water .
3.In test tube R,no gas was produced even on boiling the water.
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The metals present in P,Q,R,S could be respectively

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Arrange the following metals in the order in which they displace each other from the solution of their salts.

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