Which metal forms an oxide when heated in air but does not react with acid?

Copper

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Magnesium

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Sodium

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Aluminium

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Solution

The correct option is A Copper
Copper reacts with oxygen to form copper oxide but does not react with acids. The reaction of copper with oxygen can be written as:
$2 C u + O_{2} \to 2 C u O$

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(a) does not react with dilute hydrochloric acid,

(b) can form $2^{+}$ and $3^{+}$ ions,

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(e) Arrange the above metals in their decreasing order of reactivity.

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(i) does not react with dilute hydrochloric acid.
(ii) can form 2+ and 3+ ions.
(iii) has a hydroxide that reacts with both acids and alkalis.
(iv) does not react with cold water but reacts with steam when heated.
Arrange the metals in increasing order of reactivity.

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Which metal forms an oxide when heated in air but does not react with acid?

The correct option is A CopperCopper reacts with oxygen to form copper oxide but does not react with acids. The reaction of copper with oxygen can be written as:2Cu+O2→2CuO

The correct option is A Copper
Copper reacts with oxygen to form copper oxide but does not react with acids. The reaction of copper with oxygen can be written as:
$2 C u + O_{2} \to 2 C u O$