Name a gas which reduces hot copper (II) oxide to copper.

Give balanced equations for Reduction of hot copper (II) oxide to copper using ammonia gas.

Give balanced equation for the following: Reduction of hot Copper(II) oxide to copper using ammonia gas.

Give a balanced equation for : Reduction of hot Copper (II) oxide to copper using ammonia gas .

When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation for this reaction and state (i) the substance oxidized and (ii) the substance reduced in the reaction.

Identify the gas in the following: Gas used as a reducing agent in reducing copper oxide to copper.

From the list of the gases - Ammonia ethane,hydrogen chloride hydrogen sulphide,ethyne- Select the gas which is used as a reducing agent in reducing copper oxide to copper.

Select from the list the gas that matches the description given in the following case : (ammonia, ethane, hydrogen chloride, hydrogen sulphide, ethyne) This gas is used as a reducing agent in reducing copper oxide to copper.

Name a solution which gives nitrogen dioxide with copper.

Given below are the steps for extraction of copper from its ore. Write the reaction involved. (i) Roasting of copper (I) sulphide. (ii) Reduction of copper (I) oxide with copper (I) sulphide. (iii) Electrolytic refining (b) Draw a neat and well labelled diagram for electrolytic refining of copper.