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Amphoteric Metals Reaction

Correct the f...

Question

Correct the following statements:
(a) Copper reacts with nitric acid to produce nitrogen dioxide.
(b) Haematite is the chief ore of aluminium.

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Solution

(a) Copper reacts with concentrated nitric acid to produce nitrogen dioxide.
3Cu + conc. 8HNO₃→3Cu(NO₃)₂ + 4H₂O + 2NO
(b) Bauxite (Al₂O₃.xH₂O) is the chief ore of aluminium.

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Q. Cold, dilute nitric acid reacts with copper to form _____ (hydrogen, nitrogen dioxide, nitric oxide).

Q. Fill in the blanks using the appropriate words given below :
(Sulphur dioxide, Nitrogen dioxide, Nitric oxide, Sulphuric acid)
(i) Cold, dilute nitric acid reacts with copper to give ____________.
(ii) Hot, concentrated nitric acid reacts with copper to form ____________.

Oxides of nitrogen react with water to form acids. Hence, the statement "Nitrogen dioxide reacts with water to form nitric acid." is true.

Q. The following statement is correct only under certain conditions. Rewrite the statement including the appropriate condition(s) and underline it in your answer.
Copper and nitric acid react together to produce nitrogen dioxide.

Nitrogen dioxide reacts with carbon dioxide to form nitric acid.

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