UNIZIK Chemistry 2014/2015 Day 3 Past Questions

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

If heat is absorbed during a chemical reaction, it is said to be

A.Thermodynamic
B.exothermic
C.isothermal
D.endothermic
E.thermostatic

The metallic ions associated with hard water are:

A.Copper and zinc
B.magnesium and silver
C.calcium and magnesium
D.potassium and tin
E.sodium and lead

An organic compound that decolourises bromine water is most likely to be:

A.saturated
B.supersaturated
C.unsaturated
D.a solid
E.protonated

A white solid which when water is poured on it produces a colourless neutral gas that burns with a sooty flame is:

A.Calcium
B.calcium oxide
C.calcium carbide
D.sodium peroxide
E.sodium sulphate.

During electrolysis of molten sodium:

A.sodium ion loses an electron
B.chlorine atom gains an electron
C.chloride ion gains an electron
D.sodium ion is oxidized
E.chloride ion is oxidized

One of these sulphides is insoluble in dilute HC1 :

A.Na₂S
B.ZnS
C.CuS
D.FeS
E.MgS

Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the:

A.Acid
B.esther of alkanoic acid
C.alkali
D.alkanol
E.all of the above

Which of these in neutral to litmus in aqueous solution?

A.NH₄CI
B.Na₂CO₃
C.FeCl₃
D.NaCl
E.None

During the electrolysis of copper (II) tetraoxosulphate (VI) solution, which of these is discharged at the cathode.

A.Cu²⁺
B.H⁺
C.Cu²⁺ and H⁺
D.Cu²⁺ and SO₄^2-

An acid and its conjugate base:

A.Can neutralize each other to form a salt
B.differ only by a proton
C.differ only by the opposite charges they carry
D.are always substances