The distance between the nuclei of chlorine atoms in a chlorine molecule is 0.194nm. The atomic radius of chlorine atom is

• A) 0.097nm
• B) 0.914nm
• C) 0.388nm
• D) 2.388nm

The volume of hydrogen gas produced at S.T.P. when 100ml of 2M hydrochloric acid reacts with excess zinc is:

• A)
  2.24dm\(^3\)
• B)
  4.48dm\(^3\)
• C)
  1.12dm\(^3\)
• D)
  44.8dm\(^3\)

Sugars can be hydrolyzed at room temperature by the action of

• A. mineral acids
• B. strong bases
• C. enzymes
• D. oxidants

Potassium trioxochlorate (V)has a solubility of 1.5 mol dm -3 at 45 oC.On cooling this solution to a temperature of 20 oC, the solubility was found to be 0.5 mol dm -3. What mass of KCIO 3 was crystalized out? [K = 39, Cl = 35.5 O =16].

• A) 1.00g
• B) 10.00g
• C) 12.25g
• D) 122.50g

The pollution from petroleum spillage in rivers and lakes can best be dispersed by

• A. Pouring detergents
• B. Passing of ships through the area
• C. Pouring organic solvents
• D. Evaporation

Which of the following is observed when a solution of iron (III) chloride is mixed with a solution of sodium hydroxide?

• A. A gas is evolved
• B. A deep blue precipitate is formed
• C. The resultant solution turns green turns
• D. A brown precipitate is formed

(a)(i) What is meant by hydrocarbons?

(ii) A hydrocarbon consists of 92.3% carbon. If it's vapour density is 39, determine its molecular formula. (H = 1; C = 12)

(b)(i) Outline a suitable laboratory procedure for obtaining ethanol from cassava tubers

(ii) List two laboratory reagents used for oxidizing ethanol to ethanoic acid.

(c) What name is given to each of the following processes?:

(i) Conversion of alkanols to alkanoates;

(ii) Breakdown of proteins to amino acids;

(iii) Conversion of oils to fats

(iv) Alkaline hydrolysis of fats and oils.

Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z. Which of the metals cannot displace Y from an aqueous solution of its salt?

• A. V
• B. W
• C. X
• D. Z

A form of carbon used for absorbing poisonous gases and purification of noble gases is

• A. wood charcoal
• B. animal charcoal
• C. carbon fibres
• D. carbon black

The salt formed from a weak acid and a strong base hydrolyzes in water to form

• A) A saturated solution
• B) an acidic solution
• C) a buffer solution
• D) an alkaline solution