i) Heat
ii) Zn$^{2+}(aq) + 4NH_3(aq) \rightarrow [Zn(NH_3)_4)]_{2+}(aq)$
iii) Brown coloured gas would be seen
iv) By addition of blue Cobalt Chloride paper which turns pink
johnmulu answered the question on April 21, 2017 at 07:34
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Which of the above substances is likely to be a gas? EXplain
Date posted: April 21, 2017. Answers (1)
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The diagram below represents the set-up that was used to prepare and collect hydrogen chloride gas in the laboratory.
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b) Write an equation for the reaction between dry hydrogen chloride gas and heated iron
Date posted: April 21, 2017. Answers (1)
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Date posted: April 21, 2017. Answers (1)
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i) Name the substance L.
ii) Name liquid M
iii) What will be observed in tube B?
iv) Why is the gas from tube B burnt?
Date posted: April 21, 2017. Answers (1)
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a) State and explain two observations made in the gas jar after some times.
(Solved)
A gas jar full of chlorine water was inverted over water and allowed to stand for some time.
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Date posted: April 21, 2017. Answers (1)
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c) Give two uses of hydrochloric acid
Date posted: April 21, 2017. Answers (1)
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i) Name substance A.
ii) Give two reasons why calcium oxide is used in the set up.
Date posted: April 20, 2017. Answers (1)
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After one day, a gas was found to have collected in the test-tube
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Date posted: April 20, 2017. Answers (1)
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At the end of the reaction, the iron powder turned into a light green solid
a) Identify the light green solid
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Date posted: April 20, 2017. Answers (1)
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i) Explain why: I. It is necessary to pass chlorine gas through the apparatus before heating begins
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Date posted: April 20, 2017. Answers (1)
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a) Name
i) Substance G
ii) A suitable drying agent
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Date posted: April 20, 2017. Answers (1)
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In an experiment, dry hydrogen chloride gas was passed through heated zinc turnings as shown in the diagram below. The gas produced was then passed through heated lead (II) oxide.
i) What is the function of water in the flask?
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In an experiment, chlorine gas was passed into moist hydrogen sulphide in a boiling tube as shown in the diagram.
a) What observation was made in the boiling tube?
b) What precaution should be taken in carrying out this experiment? Give a reason.
c) Distinguish between the bleaching action of chlorine and that of sulphur(IV) Oxide.
d) Write an equation of the reaction that took place in the boiling tube
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Identify Z and M.
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i) Write an equation for the formation of sulphur (IV) oxide from sulphur
ii) What is the role of concentrated sulphuric (VI) acid in chamber A?
iii) Name two catalysts that can be used in the catalystic chamber A?
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Date posted: April 20, 2017. Answers (1)
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Date posted: April 20, 2017. Answers (1)
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aState and explain the observations made in the:
i) Tube labelled A;
ii) State one precaution that should be taken when carrying out this experiment.
Date posted: April 20, 2017. Answers (1)