Que-1: (a) A solution has a pH of 7. Explain how you would:

(i) increase its pH;
(ii) decrease its pH;
(b) If a solution changes the colour of litmus from red to blue what can you say about its pH?
(c) What can you say about the pH of a solution, that liberates carbon dioxide from sodium carbonate?

Ans: (a) (i) By adding a base or alkali to the solution.
(ii) By add an acid to the solution.
(b) Blue litmus indicates a basic solution, so the pH is greater than 7.
(c) An acid will liberate carbon dioxide on reaction with sodium carbonate. So, the pH of the solution will be acidic, means below 7.

Que-2: Match the following:

Ans:

Que-3: Match the salts given in column I with their method of preparation given in column II.

Ans:

Que-4: From the following list-

Na₂O, SO₂, SiO₂, Al₂O₃, MgO, CO — Select an oxide which dissolves in water forming an acid.

Ans: SO₂
The following reaction takes place.
SO₂ + H₂O ⟶ H₂SO₃

Que-5: From the list given below, which one is :

(i) a deliquescent compound
(ii) a compound soluble in hot water but insoluble in cold water
(iii) a compound which in the aqueous solution state, is neutral in nature.
A. Nitroso iron [II] sulphate
B. Iron [III] chloride
C. Chromium sulphate
D. Lead chloride
E. Sodium chloride

Ans:
B: Iron [III] chloride
D: Lead [II] chloride
E: Sodium chloride

Que-6: From the list of salts, Choose the salt that most appropriately fits the description given below :

 AgCl, MgCl₂, NaHSO₄, PbCO₃, ZnCO₃, KNO₃, Ca(NO₃)₂.

(i) a deliquescent salt
(ii) an insoluble chloride.

Ans:
(i) MgCl₂
(ii) AgCl

Que-7: Give a suitable word or phrase for :

(i) A salt formed by incomplete neutralisation of an acid by a base.
(ii) The definite number of water molecules bound to some salts.
(iii) The process in which a substance absorbs moisture from the atmospheric air to become moist, and ultimately dissolves in the absorbed water.
(iv) A salt containing a metal ion surrounded by other ions or molecules.
(v) A base which is soluble in water.

Ans:
(i) Acid salt
(ii) Water of crystallisation
(iii) Deliquescence
(iv) Complex salts
(v) Alkali

Que-8: Name the method used for the preparation of the following salts from the list given below –

(i) Sodium nitrate
(ii) Iron (III) chloride
(iii) Lead chloride
(iv) Zinc sulphate
(v) Sodium hydrogen sulphate.
List:
A : Simple displacement
B : Neutralization
C : Decomposition by acid
D : Double decomposition
E : Direct synthesis

Ans:
(i) Sodium nitrate — B : Neutralization
(ii) Iron (III) chloride — E : Direct synthesis
(iii) Lead chloride — D : Double decomposition
(iv) Zinc sulphate — A : Simple displacement
(v) Sodium hydrogen sulphate — C : Decomposition by acid

—:  End of Acids Bases and Salts Very Short Ans Concise Class-10 ICSE Chemistry Selina Solutions : –

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