Write a balanced chemical equation of reaction of citric acid with basic copper oxide forming copper citrate

Q. Write the balanced chemical equations of the following word equation:
Copper + Nitric acid $\to$ Copper nitrate + Nitric oxide + water

Q.

Write balanced equations for the following reactions:

Copper oxide and dilute hydrochloric acid

Q. On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.
(a) Predict the new compound formed which imparts a blue-green colour to solution.
(b) Write a balanced chemical equation of the reaction which takes place.
(c) On the basis of the above reaction, what can you say about the nature of copper oxide?

Q. Write balanced chemical equations for the reduction between copper oxide by hydrogen.

Q.

(a) Explain the following in terms of gain or loss of oxygen with one example each :

(i) oxidation (ii) reduction

(b) When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.