Copper does not react with dilute $H C l$ but reacts in the presence of air or oxygen because:

copper is ranked lower than hydrogen in the activity series

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HCl is not an oxidising agent

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air or oxygen oxidises the copper metal to copper (+2) ion

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all of these

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Solution

The correct option is D all of these
Copper does not react with $H C l$ dilute reacts in the presence of air or oxygen because it gets oxidized to $C u^{2 +}$ and thus forms $C u C l_{2}$ . But in case of $C u + H C l ⟶ C u_{2} C l_{2} (Δ G > 0)$ is formed whose formation is non-spontaneous.

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Similar questions

Q. Assertion :Copper does not react with

H C l

while copper oxide does. Reason: Copper has a higher reduction potential than hydrogen.

(a) A dilute acid B does not normally give hydrogen when reacted with metals but does give a gas when reacts with copper. Identify B. Write equation with copper.

(b) Complete the table :

$\begin{matrix} Name of Process & Inputs & Equation & Output Ammonia & Nitric acid +Air \end{matrix}$

Copper does not react with conc. sulphuric acid but reacts with the dilute acid

Q. Identify the substances B. If dilute acid 'B' which does not normally give hydrogen when reacted with metals but does give a gas when it reacts with copper.

Q. Assertion :Copper does not react with dilute sulphuric acid, liberating hydrogen. Reason: Copper is lower in reactivity series than hydrogen, or more fundamentally, because the magnitude of change in gibbs free energy when a single atom of elemental hydrogen ionizes is greater than the magnitude of the change in gibbs free energy when a single atom of elemental copper ionizes.

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Copper does not react with dilute HCl but reacts in the presence of air or oxygen because:

The correct option is D all of theseCopper does not react with HCl dilute reacts in the presence of air or oxygen because it gets oxidized to Cu2+ and thus forms CuCl2. But in case of Cu+HCl⟶Cu2Cl2(ΔG>0) is formed whose formation is non-spontaneous.

Copper does not react with dilute $H C l$ but reacts in the presence of air or oxygen because:

The correct option is D all of these
Copper does not react with $H C l$ dilute reacts in the presence of air or oxygen because it gets oxidized to $C u^{2 +}$ and thus forms $C u C l_{2}$ . But in case of $C u + H C l ⟶ C u_{2} C l_{2} (Δ G > 0)$ is formed whose formation is non-spontaneous.