Selina Concise Chemistry Class 10 ICSE Solutions Practical Work

Selina Concise Chemistry Class 10 ICSE Solutions Practical Work

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Selina ICSE Solutions for Class 10 Chemistry Chapter 13 Practical Work

Exercise 1

Solution 1.

(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.

Solution 2.

(a) O₂
(b) NH₃
(c) Water vapour
(d) SO₂

Solution 3.

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

Solution 4.

Silver nitrate and ammonium nitrate.

Solution 5.

(a) Cl^–
(b) SO₄^2-
(c) CO₃^2-
(d) SO₃^2-

Solution 6.

(a) Since the salt solution turned blue litmus red hence the salt may be an acid.
(b) Since addition of barium chloride into the solution of salt gave white precipitate so the salt may contain SO₄^2-, SO₃^2-, CO₃^2– anion.
(c) The flame test of the salt gives persistent golden yellow colourisation which suggests presence of Na⁺ ion.

Solution 7.

(a) Ca²⁺
(b) Cu⁺
(c) The three ways are:

1. Ammonia gas turns moist red litmus blue.
2. If a rod dipped in concentrated HCl is brought near the gas, dense white fumes of NH₄Cl are formed.
3. The gas turns colourless Nessler’s reagent i.e. K₂HgI₄ brown.

Solution 8.

Solution 9.

(P) Ammonium chloride
(Q) Calcium
(R) Calcium hydroxide
(S) Lead (II) Nitrate
(T) Calcium Oxide
(U) Lead (II) Oxide
(V) Chlorine
(W) Hydrogen chloride

Solution 10.

Solution 11.

(i) Sodium carbonate and sodium sulphite can be distinguished by using acidified K₂Cr₂O₇:
Take a small quantity of salt in a test tube; add dil. H₂SO₄.and warm if necessary. Now if on bringing a filter paper moistened with acidified K₂Cr₂O₇ near the gas evolved, the orange colour of the paper turns green then it is sodium sulphite.

(ii) Sodium thiosulphate and sodium sulphite:
The salts can be distinguished by using silver acetate. To the salt silver acetate and dil. HNO₃ are added. If there is formation of a white precipitate which slowly turns black then it is thiosulphate anion since silver acetate forms Ag₂S₂O₃ which being unstable in acid solution gets converted to black Ag₂S.

(iii) Sodium hydroxide solution and ammonium hydroxide solution:
These salts can be distinguished by using a metal cation like calcium. When we add calcium salt to sodium hydroxide and ammonium hydroxide, then a white curdy ppt. is formed only in case of sodium hydroxide.

(iv) Ammonium sulphate and sodium sulphate:
These salts can be distinguished by using KOH. When KOH is added to ammonium sulphate, ammonia gas is evolved. Whereas there is no evolution of ammonia gas in case of sodium sulphate.

(v) Add barium chloride solution to sulphuric acid, nitric acid and hydrochloric acid. A white precipitate is formed in dilute sulphuric acid, and no such precipitate is formed in nitric acid and hydrochloric acid.
BaCl_2(aq)  + H₂SO_4(aq) → BaSO_4(s) + 2HCl_(aq)

Solution 12.

(a) Lead chloride as precipitate and sodium nitrite are formed.
(b)

(c) Dilute sulphuric acid liberates carbon dioxide from metallic carbonates and bicarbonates. Carbon dioxide when bubbled into a test tube containing calcium hydroxide solution turns it milky.

Solution 1 (2004).

Solution 1 (2005).

(I) Iron (II) Sulphate and Magnesium sulphate
(II) Iron (III) chloride and Zinc Chloride
(III) Lead nitrate
(IV) Copper nitrate.
(V) Lead nitrate.

Solution 1 (2006).

(a) When alkaline phenolphthalein solution is added to acids then the colourless solution remains colourless.
(b) Orange colour of methyl orange indicator turns pink when the indicator is added to acids.
(c) Neutral litmus solution turns red on addition to acids.

Solution 1 (2007).

Solution 1 (2008).

(a) Iron (II) sulphate
(b) (I) Ammonia (NH₃)
(II) Dilute nitric acid (HNO₃)
(III) H₂S
(IV) Chlorine (Cl₂)
(V) Ethanol

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