1 Write the probable colour of the following salts :
(a) Ferrous salts
(b) Ammonium salts
(c) Cupric salts
(d) Calcium salts
(e) Aluminium salts.
Solution

2 Name:
(a) a metallic hydroxide soluble in excess of NH₄OH.
(b) a metallic oxide soluble in excess of caustic soda solution.
(c) a strong alkali.
(d) a weak alkali.
(e) two colourless metal ions.
(f) two coloured metal ions.
(g) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
(h) two bases which are not alkalis but dissolve alkalis.
(i) a coloured metallic oxide which dissolve in strong alkalis to yield colourless solutions.
(j) a colourless cation not a representative element.
Solution

3 Write balanced equations for Q.2 (g) and (i). Solution

4 What happens when ammonia solution is added first dropwise and then in excess to the following solutions :
(i) CuSO₄
(ii) ZnSO₄
(iii) FeCl₃
Write balanced equations for these reactions. Solution

5 What do you observe when caustic soda solution is added to the following solution, first a little and then in excess:
(a) FeCl₃
(b) ZnSO₄
(c) Pb(NO₃)₂
(d) CuSO₄
Write balanced equations for these reactions. Solution

6 Name the chloride of a metal which is soluble in excess of ammonium hydroxide. Write equation for the same. Solution

7 On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (choose from Na, Al, Zn, Pb, Fe)
(a) Which metal salt solution was used ?
(b) What is the formula of the white gelatinous precipitate obtained ?
Solution

8 (a) a yellow monoxide that dissolves in hot and concentrated caustic alkali.
(b) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
(c) a compound containing zinc in the anion.
Solution

9 Select the correct answers -
(a) Colour of an aqueous solution of copper sulphate is
(i) Green
(ii) Brown
(iii) Blue
(iv) Yellow
(b) Colour of the precipitate formed on adding NaOH solution to iron (II) sulphate solution is
(i) White
(ii) Brown
(iii) Green
(iv) Pale blue
(c) A metal which produces hydrogen on reacting with alkali as well as with acid.
(i) Iron
(ii) Magnesium
(iii) Zinc
(iv) Copper
(d) The salt solution which does not react with ammonium hydroxide is
(i) Calcium nitrate
(ii) Zinc nitrate
(iii) Lead nitrate
(iv) Copper nitrate (2018)
Solution

10 What do you observe when freshly precipitated aluminium hydroxide reacts with caustic soda solution ? Give balanced equation. Solution

11 You are provided with two reagent bottles marked A and B. One contains NH₄OH solution and the other contains NaOH solution. How will you identify them by a chemical test ? Solution

12 Distinguish by adding : Sodium hydroxide solution or ammonium hydroxide solution to
(a) Calcium salt solution and lead salt solution.
(b) Lead nitrate solution and zinc nitrate solution.
(c) Copper salt solution and ferrous salt solution.
(d) Fe(II) salt solution and Fe(III) salt solution.
(e) Ferrous nitrate and lead nitrate
Solution

13 How will you distinguish lead nitrate and zinc nitrate solution ? Solution

14 What is observed when hot concentrated caustic soda solution is added to (a) Zinc and (b) Aluminium ? Write balanced equations. Solution

15 (a) What do you understand by amphoteric oxide ?
(b) Give the balanced equations for the reaction with two different amphoteric oxides with a caustic alkali.
(c) Name the products formed.
Solution

16 Write balanced equations for the following conversions

Solution