A sample of copper (II) carbonate when heated in a hard glass tube, formed a black residue of copper(II) oxide with the evolution of a colourless gas.
(i) write the balanced equation for the reaction.
(ii) Identify the colourless gas.
(iii) State the type of the reaction .

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.

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (Black), oxygen gas and a brown gas X is formed (a) Write a balanced chemical equation of the reaction. (b) Identify the brown gas X evolved. (c) Identify the type of reaction. (d) What could be the pH range of aqueous solution of the gas X ?

(i) Write composition of copper matte. (ii) Write balanced equations for the reactions involved in the extraction of copper from copper matte.

Write balanced chemical equations for the following reaction Reduction of lead (II) oxide by carbon

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed. Write a balanced chemical equation of the reaction.

(a) Write the chemical equation in the balanced form. Fe(s) + H_(2)O(g) to Fe_(3)O_(4)(s) + H_(2)(g) (b) Identify the type of reaction from the equation given below : Na_(2)SO_(4)(aq) + BaCl_(2) (aq) to BaSO_(4)(s) + NaCI(aq) (c) You could have noted that when copper powder is heated in a china dish, the surface of copper powder gets coated with black coloured substance. (i) Why is this black coloured substance formed ? (ii) What is this black substance ? (iii) Write the chemical equation of the reaction taking place.

When hydrogen is passed over copper oxide. copper and steam are formed. Write a balanced chemical equation for this reaction and state which of the chemicals are non-metals.

Write short notes on (i) isomerization reactions (ii) balanced equations