ABU Chemistry 2013/2014 Past Questions

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

A mixture contains 20cm³ of hydrogen, 35cm³ of oxygen, 15c³ of carbon dioxide and 10cm³ of nitrogen at STP which of the following gives the mole fraction of hydrogen in this mixture?

A.0.02
B.0.18
C.0.20
D.0.25
E.20

0.07g of a hydride of carbon occupies 56 at STP when vaporised and contains 14.29% by mass of hydrogen. The formula of the hydrocarbon is

A.CH₄
B.C₂H₂
C.C₂H₄
D.C₃H₈
E.C₃H_0/sub>

The pressure on 100cm³ of oxygen gas at 35°c is 750mmHg. What would be the volume of the gas if the pressure is increased to 1000mm of Hg without charging the temperature?

A.133.3cm³
B.85cm³
C.75cm³
D.85cm³
E.58cm³

Which of the following bonds exist in crystalline ammonium chloride(NH₄CL)?

A.ionic and covalent
B.ionic and co-ordinate
C.ionic, covalent and co-ordinate
D.covalent, co-ordinate and metallic
E.ionic, covalent and metallic

Which of the following is a neutralization reaction? Addition of

A.nitric acid to hydrochloric acid
B.nitric acid to sulphuric acid
C.acid to distilled water
D.nitric acid to sodium hydroxide
E.sodium chloride to distilled water

In the preparation of carbon monoxide by heating ethanedoic acid with concentrated sulphuric acid

A.oxidizing agent
B.reducing agent
C.dehydrating agent
D.reaction medium
E.catalyst

How many grammes of methyl acetylene(propane) CH₀-C=CH will completely discharge the colour of 8g of bromine?(BT = 80, C = 12, H = 1)

A.0.5
B.1.0
C.2.0
D.3.0
E.4.0

Brass as an alloy containing copper and

A.zinc
B.tin
C.aluminium
D.silver
E.lead

60cm³ of hydrogen are sparkled with 20cm³ of oxygen at 100°c and 1 atmosphere. The total volume of the residual gasses is

A.60cm³
B.10cm³
C.40cm³
D.30cm³
E.70cm³

If the rate of diffusion of oxygen gas is taken as 1, what will be rate of diffusion of methane whose relative molar mass is 16?

A.2.0
B.1.8
C.1.4
D.1.0
E.0.5