You must have seen tarnished copper vessels being cleaned with lemon or tamarind, juices. Explain why these sour substances are effective in cleaning the vessels.

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Solution

Acid react with dirt present on the metal surface and breakdown them.
Acid remove any ionic deposit also from the surface of metal.

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Question 13
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice.

Explain why these sour substances are effective in cleaning the vessels.

Q. Assertion :You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Reason: Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. Tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its charateristic lustre.

Q. Assertion :Tarnished copper utensils are cleaned with lime juice or tamarind. Reason: When these tarnished vessels are rubbed with lime juice or tamarind the weak acids present in them dissolve the green copper carbonate and original shine returns.

Q. Lemon or tamarind is used for cleaning copper vessel turned greenish.

Comment on the above statement.

Write scientific reasons.

Lemon or tamarind is used for cleaning copper vessels turned greenish.

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You must have seen tarnished copper vessels being cleaned with lemon or tamarind, juices. Explain why these sour substances are effective in cleaning the vessels.

Acid react with dirt present on the metal surface and breakdown them. Acid remove any ionic deposit also from the surface of metal.

Acid react with dirt present on the metal surface and breakdown them.
Acid remove any ionic deposit also from the surface of metal.