Question

7. Assertion-When copper is reacted with nitric acid a brown color gas is produced Reason-it is due to the oxidizing nature of nitric acid which oxidizes the hydrogen gas to water and self reduces from nitrate to nitrogen dioxide. (1 Point Assertion and reason both are correct and reason is the correct explanation of assertion Assertion and reason both are correct but reason is not the correct explanation of assertion Assertion is correct reason is wrong Assertion is wrong reason is correct​

Answer 1

Answer:

Copper is a reddish-brown metal, widely used in plumbing and electrical wiring; it is perhaps most familiar to people in the United States in the form of the penny. (Although since 1983, pennies are actually made of zinc surrounded by a paper-thin copper foil to give them the traditional appearance of pennies.) Copper is oxidized by concentrated nitric acid, HNO3, to produce Cu2+ ions; the nitric acid is reduced to nitrogen dioxide, a poisonous brown gas with an irritating odor:

Cu(s) + 4HNO3(aq) ——> Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l)

When the copper is first oxidized, the solution is very concentrated, and the Cu2+ product is initially coordinated to nitrate ions from the nitric acid, giving the solution first a green, and then a greenish-brownish color. When the solution is diluted with water, water molecules displace the nitrate ions in the coordinate sites around the copper ions, causing the solution to change to a blue color.

In dilute nitric acid, the reaction produces nitric oxide, NO, instead:

3Cu(s) + 8HNO3(aq) ——> 3Cu(NO3)2(aq) + 2NO(g) + 4H2O(l)

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Answer 2

Answer:

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