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

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

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

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

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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

Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. Which behaves as an oxidizing agent?

A. Fe2+
B. Cl2
C. Fe3+
D. Cl-
E. H2O

Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by?

A. passing each gas through bromine water
B. passing each gas through dilute potassium permanganate solution
C. passing each gas through silver nitrate solution
D. treating each gas catalytically with excess hydrogen gas

Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of
A. barium chloride solution
B. dilute hydrochloric acide
C. lead nitrate solution
D. calcium chloride solution
E. sodium hydroxide solution

If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because
A. both zinc and copper are metals
B. the sulphate radical and the zinc ion are divalent
C. zinc is more electropositive than copper
D. both zinc and copper form depositive ions in solution
E. zinc is a reducing agent