Which of the following will be a displacement reaction?
(a) zinc + hydrochloric acid
(b) iron + copper sulphate
(c) magnesium + sulphuric acid
(d) all the above

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Solution

(d) all the above

Magnesium and zinc (placed above hydrogen in the reactivity series) are more reactive than hydrogen. Thus, they displace hydrogen from dilute acids. Iron (placed above copper in the reactivity series) is more reactive than copper. Hence, it displaces copper from its salt solution. Thus, all the given reactions are examples of displacement reaction.

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