Chemistry
(a) Give only one suitable chemical test to identify the following gases.
(i) Ammonia
(ii) Sulphur dioxide
(iii) Hydrogen chloride
(iv) Chlorine
(v) Carbon dioxide
(vi) Oxygen
(vii) Hydrogen
(b) Select a basic gas mentioned in Q. 1(a). How is the basic nature suspected?
(c) Select acidic gases from the gases mentioned in Q. 1 (a). How is the acidic nature suspected?
(d) The two gases A and B are bleaching agents. A is greenish yellow and bleaches due to it's oxidising property while B a colourless gas bleaches due to reduction. Identify A and B.
(e) Which gas turns blue cobalt chloride paper light pink?
Give one similarity in test between (i) Cl2 and HCl (ii) SO2 and CO2.
Practical Chemistry
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Answer
(i) Ammonia — When a glass rod dipped in conc. HCl is brought near the gas, dense white fumes of ammonium chloride are formed.
(ii) Sulphur dioxide — Sulphur dioxide gas turns acidified potassium permanganate from pink to clear colourless and acidified potassium dichromate from orange to clear green.
(iii) Hydrogen chloride — Forms a curdy white ppt. on passage through AgNO3 solution. The precipitate dissolves in excess of NH4OH.
(iv) Chlorine — Chlorine turns moist blue litmus red and then bleaches it.
(v) Oxygen — Oxygen gas rekindles a glowing wooden splinter.
(iv) Hydrogen — Hydrogen gas burns with a 'pop' sound in air.
(b) Ammonia is a basic gas. It turns red litmus blue.
(c) Sulphur dioxide, Hydrogen chloride, Chlorine, Carbon dioxide.
(d) A is Chlorine and B is Sulphur dioxide.
(e) Water vapour
(i) Similarity in test of Cl2 and HCl — Forms a white ppt. on reaction with AgNO3 solution.
(ii) Similarity in test of SO2 and CO2 — Both turn lime water milky.
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Related Questions
Name the gases which
(a) extinguishes burning wooden splinter.
(b) turns moist red litmus blue.
(c) do no effect on moist litmus.
(d) affect the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Name:
(a) Two carbonates which do not produce carbon dioxide on heating.
(b) A colourless gas which bleaches
(c) Gases which have sour taste
(d) Greenish yellow gas which also bleaches
(e) Gas with rotten egg smell.
Carbon dioxide and sulphur dioxide gas can be distinguished by using
(i) moist blue litmus paper
(ii) lime water
(iii) acidified potassium dichromate paper
(iv) none of the above.
The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is :
- Iron (III) sulphate
- Iron (II) sulphate
- Iron (II) chloride
- Iron (III) chloride