The following atoms of carbon¹²₆C,¹³₆C and¹⁴₆C can be described as?

• A. Allotropes
• B. Isomers
• C. Isotopes
• D. Isotones

117.0g of sodium chloride was dissolved in the solubility in 1.0dm³ of distilled water at 25oC. Determine the solubility in mol dm^-3 of sodium chloride at that temperature [Na = 23, Cl = 35.5]

• A. 1.0
• B. 2.0
• C. 3.0
• D. 4.0

What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g)

• A. Activation energy will decrease
• B. the forward reaction will be favoured
• C. the concentration of ammonia will increase
• D. the reaction will go to completion

(a)(i) What is 2 homologous series?

(ii) Give two homologous series present in petroleum

(iii) Give one example of a compound belonging to each of the homologous series in (a)(ii).

(iv) Name two fractions obtained from the fractional distillation of petroleum

(v) Why is there a gradual change in the physical properties of petroleum fractions?

b) Write a two-step balanced chemical equation for the reaction of (i) ethanol with excess concentration traoxosulphate (VI) acid at high temperature

(ii) excess ethanol with concentrated tetraoxosulphate (VI) acid at lower temperature.

(c) An organic compound of relative molecular mass 46, on analysis vas ound to contain 52.0% carbon, 13.3% hydrogen and 34.7% oxygen.

(i) Determine its I. empirical formula, II. molecular formula.

(ii) Draw two possible structures of the compound and name one of them [O = 16; C = 12; H = 1 ]

The shape of the water molecule is?

• A. Linear
• B. Pyramidal
• C. Tetrahedral
• D. V-shaped

A change in temperature of a saturated solution disturb the equilibrium between the

• A. Dissolved solute and the solvent
• B. Solvent and undissolved solute
• C. Dissolved solute and undissolved solute
• D. Dissolved solute and the solution

An oxide has the following properties. It

I. is a white powder II. reacts with HCI. III. reacts with NaOH IV. is insoluble in water The oxide is

• A. alkaline
• B. amphoteric
• C. acidic
• D. neutral

A gaseous mixture contains 0,256 g of hydrogen and 2.00 g of oxygen. The mole ration of hydrogen to oxygen in the mixture is (H=1.00; O=16,0)

• A. 1:1
• B. 2:1
• C. 1:4
• D. 8:1

Which is the most ionic in the group below?

• A) Cl₂
• B) NaCl
• C) AlCl₃
• D) CaCl₂

Which of the following gases will diffuse most rapidly? [H = 1.00, C = 12.0, O = 16.0, S = 32.0, Cl = 35.5]

• A. Cl2
• B. SO2
• C. CH4
• D. C2H6