Which of these metals cannot be used to prepare hydrogen by the action of an acid?

(a) sodium
(b) iron
(c) calcium
(d) copper

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Solution

(d) copper
Copper is a less reactive metal; therefore, it cannot displace and liberate hydrogen from acids.

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Which of these metals cannot be used to prepare hydrogen by the action of an acid? (a) sodium (b) iron (c) calcium (d) copper

(d) copper Copper is a less reactive metal; therefore, it cannot displace and liberate hydrogen from acids.

Which of these metals cannot be used to prepare hydrogen by the action of an acid?

(a) sodium
(b) iron
(c) calcium
(d) copper

(d) copper
Copper is a less reactive metal; therefore, it cannot displace and liberate hydrogen from acids.