MCQ Questions

Question No. 1

Distinguish between strong and weak alkalis, and concentrated and dilute alkalis.

Answer :

Question No. 2

What is an indicator? Name four indicators often used in the laboratory.

Answer :

Question No. 3

Explain the meaning of equivalence point and titration.

Answer :

Question No. 4

70 cm3 of a solution of sodium hydroxide (concentration 5 0.18 mol·dm–3) reacts completely with 30 cm3 of a solution of sulphuric acid.

Answer :

a) Write a balanced equation for the reaction.

b) Calculate the concentration of the sulphuric acid solution.

c) Calculate the mass of the sodium hydroxide used in the titration.

Question No. 5

In preparing a standard basic solution, a student dissolves 14 g potassium hydroxide in 1.0 dm3 of water. In a titration, 30 cm3 of KOH(aq) is neutralised by a sulphuric acid solution with a concentration of 0.10 mol·dm–3.

Answer :

a) Calculate the concentration of the basic solution.

b) Calculate the volume of H2SO4(aq) used in the titration.

c) Is the pH of the end point in this titration acid, basic or neutral?

Question No. 6

Calculate the mass of MgO needed to neutralise 40.0 ml of a 0.25 mol·dm–3 HCl solution.

Answer :

Chapter

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