The diagram below represent the electron sub-level for

• A. carbon
• B. nitrogen
• C. oxygen
• D. flourine

When 100cm³ of a saturated solution of KCIO₃ at 40°C is evaporated, 14 g of the salt is recovered what is the solubility of KCIO₃ at 40°C? [KCIO₃ = 122.5]

• A. 11.42 mol/dm³
• B 8.80 mol/dm³
• C. 1. 14 mol/dm³
• D. 0.88 mol/dm³

From the words lettered A. to D below each of the following sentences, choose the word or group of words that is nearest in meaning to the underlined word as it is used in the sentences.

Theproscription of the political parties was one of the steps taken by the military.

• A. launching
• B. expulsion
• C. banning
• D. removal

What is the oxidation number of nitrogen in AI(NO₃)₃?

• A. + 1
• B. + 3
• C. + 5
• D. + 6

An element wil readily form an electrovalent compound if it electron configuration is

• A. 2, 8, 1
• B. 2, 8, 4
• C. 2, 8, 8
• D. 2, 8, 5

Benzene contains six carbon atoms and six hydrogen atoms.

(a)(i) Draw two stable structures of benzene to show how these atoms are arranged.

(ii) What is the concept behind these structures?

(b) Give (i) two uses of benzene. (ii) one industrial source of benzene.

Beryllium and Aluminium have similar properties because they

• A) are both metals
• B) belong to the same group
• C) belong to the same period
• D) are positioned diagonally to each other

What mass of copper would be formed when a current of 10.0 A is passed through a solution of CuSO₄ for 1 hour? [Cu = 63.5; 1F = 96500C]

• A. 5.9 g
• B. 11.8 g
• C. 23.8 g
• D. 47.3 g

Candidate devised the following for the separation of the components of some mixtures.

i. Components of ink; principles involved is chromatography

ii. Components of water and kerosene principle involved is separating funnel.

iii. Components of iodine and sodium chloride, principles involved is sublimation.

In which of the above is the principle used correct?

• A) i only
• B) ii only
• C) i only
• D) i, ii, and iii

Which of the following substances is a heavy chemical?

• A. Ammonia
• B. Barim Hydroxide
• C. Hydrochloric acid
• D. Tetraoxosulphate(VI)acid