Q.3 (iii) (a) What happens when copper reacts with concentrated nitric acid ? What is the colour of the gas released during the reaction ?(b) Write its balanced chemical equation.(c) Write the names of reactants and products.

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Answer: Copper dissolves, forming copper nitrate, and reddish-brown nitrogen dioxide gas is given off. (a) Concentrated nitric acid is a strong oxidising agent. Copper dissolves in it to form a blue-green solution of copper nitrate, and reddish-brown NO₂ gas is released. (b) Cu + 4HNO₃ (conc.) → Cu(NO₃)₂ + 2NO₂uparrow + 2H₂O (c) Reactants: copper and concentrated nitric acid. Products: copper nitrate, nitrogen dioxide and water.

Q.3 (iii) (a) What happens when copper reacts with concentrated nitric acid ? What is the colour of the gas released during the reaction ?(b) Write its balanced chemical equation.(c) Write the names of reactants and products.

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