In an attempt to remove sugar from a breaker containing a quantity of sand and sugar, 2 M ammonium chloride solution was accidentally added instead of water. Which of the following method could be used to remove the ammonium chloride from the mixture?

A. Fractional distillation

B. crystallization

C. Filtration followed by evaporation

D. Evaporation followed by sublimation

E. Filtration followed by sublimation

The alloy duralumin is used for the building of aeroplanes because it?

A. asborbs heat readily from sure thereby preventing the inside of the plane from getting cold at high attitudes

B. reflects sunlight readily, thereby keeping the inside of the plane cool

C. is extremely durable and possesses reflective ability

D. is easily the lightest building material

E. possesses both strenght and lightness

A solution X on mixing with AgNO₃ solution, gives a white precipitate solution in NH₃. A Solution Y, when added to X, also gives a white precipiate which is soluble on boiling. Solution Y contains?

A. Ag⁺ion

B. Pb²⁺ion

C. Pb⁴⁺ion

D. Zn²⁺ion

E. Al³⁺ion

10cm3 of CO is mixed and sparked with 100cm3 of air containing 21% O2. If all the volumes measured at S.T.P. the volume of resulting gases would be?

A. 90cm³

B. 100cm³

C. 105cm³

D. 110cm³

E. 115cm³

A sample of an oxide of mercury weighed 1.00g. When this was heated, oxygen was given off, and 1.00g of mercury metal only was left. What is the formula of the oxide?

A. Hg₂O

B. HgO₂

C. HgO₂

D. HgO

E. None of the above

On heating, under suitable conditions, 1 litres of monoatomic gas,X, combines with 1¹/₂ litres of an oxide, What is the formula of the oxide.

A. XO₃

B. X₂O₃

C. X₃O₂

D. XO₂

E. None of the above

If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litre of water,and resulting solution mixed thoroughly, the resulting sulpuric acid concentration will be?

A. 2.2 M

B. 1.1 M

C. O.22 M

D. 11 M

E. 0.20 M

Which of the following reactions is correct as as written?

A. FeCl₂ + 3NH₄OH → Fe(OH)₃ + 3NH₄Cl

B. Pb₂O₃ + 4HCl → PbCl₂ + 2H₂O

C. PbNO₃ + H₂S → PbS + 2HNO₃

D. NaOH + H₂SO₄ → NaHSO₄ +H₂O

E. 2NH₄NO₃ → N₂ + 2H₂O

Under high pressure, real gases do not obey gas laws because their molecules?

A. have become more energetic

B. have become less energetic

C. have become smaller in size

D. decompose into atoms

E. start repelling each other

How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm³ of 6M HCl?


(Mg=24, H=1, Cl=35.5)

A. 1.2 g

B. 0.7 g

C. 0.5 g

D. 0.3 g

E. 0.12 g