Question

6)write down the changes and explain the reason behind it
(c) Two or three filings of copper were
added to 10ml dilute nitric acid and
stirred​

Answer 1

Answer:

The changes observed when two or three filings of copper were added to 10ml dilute nitric acid and stirred are:

i. The solution changes to bluish red.

ii. A red toxic gas is evolved.

iii. Copper is completely consumed.

Explanation: The changes occur due to the following reaction

Cu + 4HNO3→ Cu(NO3)2 + 2NO2 + 2H2O

In the above reaction, the copper metal is oxidized by nitric acid. The nitrogen dioxide (NO2) formed in the reaction is so dangerous and toxic.

Explanation:

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