Chemistry Past Questions and Answers

Consider the following equation H₂O + 2Fe²⁺ + Cl₂ â†” 2Fe³⁺ + 2Cl^- + H₂O. The only ion which behaves as an oxidising agent is

A Fe²⁺
B Cl₂
C Fe³⁺
D Cl^-
E H₂O

Question 37:

If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is

A Dilute sulphuric acid
B Dilute hydrochloric acid
C Unreacted hydrogen sulphide in water
D Iron (III) chloride
E Iron (II) chloride

Question 38:

Which of the following changes is physical?

A Adding iron filing to aerated water
B Adding sodium metal to water
C Cooling a solution of Iron (II) sulphate to obtain the hydrated salt
D Cooling water to obtain ice
E Burning the domestic gas (Utilgas) for cooking

Question 39:

By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and

A Potassium nitrate
B Sand
C Lead nitrate
D Sugar (glucose)
E Starch

Question 40:

In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?

A In the beaker
B In the conical flask
C In a burette
D In the standard flask
E In the measuring cylinder