K.C.S.E Chemistry Q & A - MODEL 2014.PP2.QN.1

15/11/2020

KCSE Chemistry 2014 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

(a) The set up below was used to prepare dry hydrogen chloride gas, and investigate its effect on heated iron filings.

(i). Name substance L
(ii) Name liquid M
(iii) What will be observed in tube B?
(iv) Write an equation for the reaction that occurs in tube B.
(v) Why is the gas from tube B burnt?
(b) (i) Explain the following observations:
I) A white precipitate is formed when hydrogen chloride gas is passed through aqueous silver nitrate.
II) Hydrogen chloride gas fumes in ammonia gas.
(ii) State two uses of hydrogen chloride gas
(c) The diagram below is a representation of an industrial process for the manufacture of a bleaching powder.

(i) Name substance Q.
(ii)When the bleaching powder is added to water during washing, a lot of soap is used. Explain

ANSWERS

(a) (i) Sodium chloride / potassium chloride /rock salt.
(ii) Concentrated sulphuric (VI) acid
(iii) Grey solid turns green

(i) I The gas reacts with silver nitrate to form insoluble silver chloride
II Both gases form ammonium chloride which is white.
(ii) To make hydrochloric acid.
Manufacture of ammonium chloride.
Manufacture of PVC.
Making chloroethene /vinyl chloride