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Question

Which elements among the following would not produce hydrogen on treatment with caustic soda?
(i) Zn

(ii) Mg
(iii) AI
(iv) Cu
(v) Sn

A
i and ii
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B
ii and iv
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C
ii and v
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D
ii and iii
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Solution

The correct option is A ii and iv
There is no reaction of magnesium or copper with sodium hydroxide. On the other hand, zinc, aluminum and tin react with sodium hydroxide to produce hydrogen gas.

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