UNIPORT Chemistry 2017/2018 Model 3 Past Questions

Practice each question, then open it to see the full details.

The isomers of C₃H₈O are

A.1 — propanol and 2 — propanol
B.1 — propanol and 1— propanal
C.2 — propanol and 2 — propanone
D.2— propanol and 1— propanal

On heating, which of the following compounds will decompose to the free metal, nitrogen(IV)oxide and oxygen?

A.Cu(NO₃)₂
B.Ag(NO₃)
C.Ca(NO₃)₂
D.NaNO₃

The raw material used for the smelting of iron ore in a furnace is

A.Zn(NO₃)₂
B.CaSO₄
C.CuSO₄
D.CaCO₃

The sulphide which is insoluble in dilute hydrochloric acid is

A.CuS
B.Na₂S
C.FeS
D.ZnS

In the industrial production of H₂ from natural gas, the CO₂ produced along with the H₂ is removed by

A.passing the mixture into lime water
B.washing under pressure
C.drying over phosphorous(V) oxide
D.using ammoniacal copper(I) chloride

Which of the following typically represents a photochemical reaction?

A.Conversion of dinitrogen(IV) oxide to nitrogen(IV) oxide
B.Conversion of silver halides to grey metallic silver
C.Decomposition of calcium hydroxide to its oxide
D.Formation of water from hydrogen and oxygen molecules

A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon(IV)oxide to diffuse under the same condition?[C = 12.0, ) = 16.0]

A.5.8 seconds
B.6.8 seconds
C.9.4 seconds
D.11.0 seconds

What is the change in oxidation number of manganese in the reaction represented by the following equation?

A.+3 to +2
B.+4 to +2
C.+5 to +2
D.+7 to +2

Which of the following elements is a d-block element?

A.Calcium
B.Iron
C.Lithium
D.Silicon

Which of the following factors would not affect the solubility of a gas?

A.Concentration
B.Nature of solvent
C.Pressure
D.Temperature