KCSE CHEMISTRY QUESTIONS AND ANSWERS PER TOPIC
(a) Give a reason why concentrated sulphuric acid is not used to dry ammonia gas
(b) Name one suitable drying agent for ammonia gas
answers
a)Being acidic, it would react with the basic ammonia
b)CaO
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Concentrated nitric (V) acid was added to iron (II) sulphate acidified with sulphuric acid and the mixture heated. The solution turned from pale green to yellow with evolution of brown gas. Explain these observations.
answer
(a) The diagram below shows a set-up that can be used to obtain nitrogen gas in an experiment. (i) Name liquid L (1mk) (ii) What observation would be made in tube K after heating for some time? (1mk) (iii) Write an equation for the reaction that took place in tube K. (1 mk) (iv) If 320 cm3 of ammonia gas reacted completely with the copper? Calculate: I Volume of nitrogen gas produced. (1mk) II the mass of copper oxide that reacted (3mks) (Cu = 63.5, O=16.O, one mole of gas occupies 24 liters at room temperature and pressure) (v) At the end of experiment the PH of the water in the beaker was found to be about ______________________ Explain (2mks) (b) In another experiment a gas jar containing ammonia was inverted over a burning splint. What observation would be made? (1mk) (c) Why is it advisable to obtain nitrogen from air instead ammonia? (1mk) |
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