Practical Work Intext Concise Class-10 ICSE Chemistry Selina Solutions Chapter-13. We Provide Step by Step Answer of Intext Questions of Exercise-13 for ICSE Class-10. The given Solutions is according to the Latest editions. Visit the official Website CISCE for detail information about the ICSE Board Class-10.

Practical Work Intext Concise Class-10 ICSE Chemistry Selina Solutions Chapter-13

Board	ICSE
Book / Publication	Concise / Selina
Subject	Chemistry
Class	10th
Writer	Dr SP Singh
Chapter-13	Practical Work
Topics	Intext
Edition	2025-2026

Intext on Practical Work

Page-231

Que-1: (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 its oxidizing property while B is colourless gas that bleaches due to reduction. Identify A and B?
(e) Which gas turn blue cobalt chloride paper light pink?
Give one similarity in test between (i)Cl₂ and HCl (ii) SO₂ and CO₂.

Ans: (a) (i) Chemical test for ammonia:
If a rod dipped in concentrated hydrochloric acid is brought near ammonia gas, dense white fumes of ammonium chloride (NH₄Cl) are formed.
(ii) Chemical test for Sulphur dioxide:
It decolorizes pink coloured potassium permanganate solution.

(iii) Chemical test for HCl:
When HCl gas is passed through AgNO₃ solution, white precipitates of AgCl are formed which gets dissolved in excess of NH₄OH.

(iv) Chemical test for Chlorine:
It turns moist starch iodide paper (KI + starch solution) blue black.
(v) Chemical test for Carbon dioxide:
When this gas is passed through lime water, it turns milky due to the formation of white precipitates of CaCO₃ and on passing excess of carbon dioxide gas, this milkiness disappears.
(vi) Chemical test for oxygen:
This gas is absorbed in colourless alkaline solution of pyrogallol and turns it dark brown
(vii) Chemical test for hydrogen:
It burns with a pop sound when a burning taper is brought near it.
(b) Ammonia is a basic gas and its basic nature is suspected through litmus paper test because it changes the colour of red litmus paper to blue.
(c) Chlorine, carbon dioxide, hydrogen chloride, hydrogen sulphide and sulphur dioxide are acidic gases since they convert blue litmus to red.
(d) A is chlorine and B is Sulphur dioxide.
(e) Water vapour.

Que-2: Name the gases which

(a) Extinguishes burning wooden splinter.
(b) Turns moist red litmus blue.
(c) Do not effect moist litmus.
(d) Affects the acidified K₂Cr₂O₇ paper and also turns lime water dirty milky.

Ans: 
(a) NH₃, HCl, SO₂, H₂S, CO₂, NO₂, Cl₂.
(b) NH₃
(c) Water vapour
(d) SO₂

Que-3: Name:

(a) Two carbonates which do not produce carbon dioxide on heating.
(b) A colourless gas which bleaches.
(c) Gases which has sour taste.
(d) Greenish yellow gas which also bleaches.
(e) Gas with rotten egg smell.

Ans: 
(a) Na₂CO₃ and K₂CO₃
(b) SO₂
(c) CO₂
(d) Cl₂
(e) H₂S

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