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Reaction with Oxygen

b i What are ...

Question

(b) (i) What are the products formed when ammonia is oxidized with copper oxide?
(ii) Name one lead compound that can be used to oxidize hydrogen chloride to chlorine.

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Solution

(i) Oxidation of ammonia with copper oxide results in the formation of copper, nitrogen (gas) and water. The equation is as follows:

2NH₃ + 3CuO → 3Cu + N₂↑ + 3H₂O

(ii) Both lead dioxide and trilead tetroxide can be used to oxidise hydrogen chloride to chlorine. The equation for both the reactions are as follows:

PbO₂ + 4HCl → PbCl₂ + 2H₂O + Cl₂↑
Pb₃O₄ + 8HCl → 3PbCl₂ + 4H₂O + Cl₂↑

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Name one lead compound that can be used to oxidise hydrogen chloride to chlorine.

What are the products formed when ammonia is oxidized with copper oxide?

Q. (a) Select from the list given below (A to F), the one substance in each case which matches the descriptions given in parts (ii) to (vi). Copy and complete the given grid with your answers as shown for part (i).

(i)	(ii)	(iii)	(iv)	(v)	(vi)
A

A Ammonia
B Copper oxide
C Copper sulphate
D Hydrogen chloride
E Conc. sulphuric acid
F Lead bromide
(i) Although this compound is not a metal hydroxide, its aqueous solution is alkaline in nature.
(ii) A solution of this compound is used as the electrolyte when copper is purified.
(iii) When this compound is electrolysed in the molten state, lead is obtained at the cathode.
(iv) This compound can be oxidized to chlorine.
(v) This is used to prepare volatile acids.
(vi) This compound can be reduced to copper when heated with coke.

Q. What do you observe when
(i) Excess ammonia is mixed with chlorine.
(ii) Ammonia in excess is mixed with chlorine.
(iii) Filter paper dipped in colourless phenolphthalein is introduced into ammonia.
(iv) Ammonia is passed over heated lead oxide.
(v) Ammonia solution is added to ferric chloride solution.
(vi) Ammonia solution is added drop by drop and then in excess to aqueous copper sulphate solution.
(vii) Ammonia comes in contact with the eyes of a person.

Q. Answer the following: [5 MARKS]
(a) What is the composition of saturated solution of hydrogen chloride gas in water?
(b) What do you see when conc. hydrochloric acid is added to lead(IV) oxide with warming?
(c) What must be added to must be added to sodium chloride to obtain hydrogen chloride?
d) What do you see when hydrogen chloride mixes with ammonia?

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