UNIZIK Chemistry 2011/2012 Day 1 Past Questions

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

Choose the best of the options from the questions below.

Which of the following metals cannot replace hydrogen from water or steam.

A.Sodium
B.Magnesium
C.Iron
D.Calcium
E.Copper.

Which one of the following changes is physical?

A.adding iron filings 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 for cooking.

0.1 Faraday of electricity was passed through a solution of copper (II) sulphate. The maximum weight of copper deposited on the cathode would he (Cu = 64)

A.64.0g
B.32.0g
C.16.0g
D.6.4g
E.3.2g.

Bronze is an alloy of

A.copper, zinc and nickel
B.aluminum and copper
C.copper and zinc
D.tin and zinc
E.tin and copper.

Starch can be converted to ethyl alcohol by

A.distillation
B.fermentation
C.isomerization
D.cracking
E.cooking.

Pick out the correct statement

A.Zinc heated to redness reacts with steam to give oxygen and zinc oxide
B.Zinc heated to redness reacts with steam to give oxygen and hydrogen.
C.Zinc does not react with hot or cold water
D.Zinc reacts with hot water to form zinc oxide and hydrogen
E.Zinc reacts very easily with cold water to give zinc oxide and hydrogen.

Chlorine, bromine and iodine resemble each other in that all

A.dissolve in alkalis
B.react violently with hydrogen without heating
C.displace each other from solutions of their salts
D.are gases
E.are liquids

When air is compressed

A.its density decrease
B.it solidifies
C.its temperature decreases
D.its temperature increases
E.its temperature remains unchanged.

Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (VI) acid?

A.Carbon (IV) oxide
B.Coal tar
C.Charcoal
D.Toxic fumes
E.None of the above.

A property of a colloidal dispersion which a solution does not have is

A.the Tyndall effect
B.homogeneity
C.osmotic pressure
D.surface polarity
E.all of the above.