Correct Answer: B. marketing concept

Explanation

(a) Graham's Law of diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of it's vapour density or relative molecular mass.

\(\frac{RO_2}{R_y} = \sqrt{\frac{M_y}{MO_2}}; \frac{\frac{100}{4}}{{\frac{50}{3}}}\)

\(\frac{100}{4}\) x \(\frac{3}{50}\) = \(\sqrt{\frac{M_y}{32}}\)

= \(M_y = \frac{32 \times 9}{4}\) = 72

(b) X\(_{(g)}\) + 2Y\(_{(g)}\) \(\rightleftharpoons\) XY\(_{2(g)}\) \(\Delta\)H = – 52 KJ mol\(^{-1}\)

(i) The yield decreases

(ii) The forward reaction is accompanied by a decrease in the number of gaseous molecules. A decrease in pressure shifts the position of equilibrium to the left favouring the backward reaction.

(iii) i. The position of equilibrium is not affected by the presence of .a catalyst. ii. The presence of a catalyst lowers the activation energy or takes the reaction through another path of lower energy barrier.

(c)(i)

(ii) I. Boiling point II. Solubility III. Sublimation or property of solid.

(d) I. Neutralization II. Double decomposition or precipitation Ill. Displacement or reduction.

(iii) Hydrated salts contain water of crystallization while anhydrous salts do not.

Correct Answer: A. rigid

Explanation

a)(i) Caesium(Cs)

(ii) Gold (Au)

(b) Solution Y has been oxidized to iron (III) salts and it will give a reddish brown precipitate with excess sodium hydroxide.

Correct Answer: D. Some parts Of the country enjoy a hot, wet tropical climate throughout the year

Correct Answer: B. primary product

Explanation

Primary product are natural raw materials, it include: crude oil, coal, iron ore, agricultural products etc.

Correct Answer: A. contribution

Correct Answer: B. 80

Explanation

Sum of interior angles in a quadrilateral is 360

(x + 20)^o + (x+ 10)^o + (2x - 45)^o + (x - 25)^o = 360^o

5x^o - 40^o = 360^o

x = 400/5 = 80^o

Explanation

(a) i) Temporary hardness and permanent hardness.

(ii) Temporary hardness

— Calcium hydrogen rioxocarbonate IV or magnesium hydrogentrioxocarbonate(IV). Permanent hardness

— Calcium etraoxosulphate (VI) or magnesium tetraoxosulphate (VI).

Temporary hardness:

iii) Ca(HCO\(_3\))\(_2\) + Ca(OH)\(_2\) \(\to\) 2CaCO\(_3\) + H\(_2\)O

OR Ca(HCO\(_3\))\(_2\) \(\to\) CaCO\(_3\) + H\(_2\)O + CO\(_2\)

Permanent hardness: CaSO\(_4\) + Na\(_2\)CO\(_3\) \(\to\) CaCO\(_3\) + Na\(_2\)SO\(_4\)

(iv) It forms precipitate of calcium salt or ;cum with soap that waste soap.

(b)(i) 1. Glucose solution —Equal to 7

II. Chlorine water — Less than 7

II. Lime water — Greater than 7

IV. Sour milk — Less than milk.

(ii) I. An acidic oxide reacts with only alkali to form salt and water only while amphoteric oxide react with both acids and alkalis to form salt and water only.

II. A dilute acid contains more water than a concentrated acid.

III. An acid salt contains replacement iydrcgen while a normal salt does not.

(c)(i) Fe\(_{(S)}\) + H\(_2\)SO\(_{4(aq)}\) \(\to\) FeSO\(_{4(aq)}\) + H\(_{2(g)}\) ;

Molar mass of FeSO\(_4\) 56 + 32 + 64 = 152

1 mole of Fe produces 152 mass of FeSO\(_4\) ;

0.5 mole of Fe will produce \(\frac{0.5 \times 152}{1}\) = 76g

ii) Monoclinic and rhombic sulphur

(d)(i) When a piece of damp starch - iodide paper is plunged in a gas ar of chlorine, the paper turns from white to blue or blue black.

(ii) Chlorine displaces iodine from starch odide. The iodine reacts with starch to form a blue black complex.

(iii) Products formed are hydrogen Chloride and nitrogen.

Explanation

(a) CIF (Cost, Insurance and Freight): A price quoted C.I.F. means that it includes the cost of goods, insurance premium and transporting the goods to the port of destination. The importer is responsible for other charges thereafter.

(b) FOB (Free on Board): All the expenses until the goods have been placed on board of a ship are borne by the seller while the buyer is responsible for the cost of unloading the goods.

(c) FOR (Free on Rail): This price quotation means that the seller has paid all charges including loading the goods on rail. The buyer has to pay subsequent charges.

(d) FAS (Free Alongside Ship): This price quotation means that the goods are delivered to the side of the ship free and the buyer is reponsible for the cost of loading on to the ship.

(e) C.F (Cost and Freight): This quotation means that the seller is only to pay for the freight while the buyer takes out insurance for the goods as the price quoted includes only the cost of the goods and freight charges