Among the following, the rate of formation of bubbles, when it is reacted with acid, is fastest in case of _________.

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Solution

The correct option is A
Mg

Higher the metal on the reactivity series, faster the reaction with an acid. The reactivity decreases in the order Mg > Al > Zn > Fe.

Thus, the rate of formation of bubbles is the fastest in the case of magnesium when it is reacted with dilute acids.

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Question 31
During the reaction of some metals with dilute hydrochloric acid, following observations were made.

(a) Silver metal does not show any change.

(b) The temperature of the reaction mixture rises when aluminium (Al) is added.

(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.

Explain these observations giving suitable reasons.

Among the following, the rate of formation of bubbles, when it is reacted with acid, is fastest in case of _________.

A metal which does not react with dilute sulphuric acid is ________________ [Mg/Al/Zn/Cu]

Among $Cu, Fe, Mg, Na, and Zn,$ select a different metals in each case, which

(a) Does not react with dilute $HCl$ .

(b) Forms $2^{+}$ and $3^{+}$ ions.

(d) Does not react with cold water but reacts with steam when heated.

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