The dehydration of CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)OH will give?

• A. HC≡CCH\(_2\)CH\(_3\)
• B. CH\(_2\)≡CH\(_2\)CH\(_3\)
• C. CH\(_3\)C≡CCH\(_3\)
• D. CH\(_3\)CH=CHCH\(_3\)

The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence of

• A) carbon(IV)oxide
• B) carbon(ll)oxide
• C) soda
• D) glucose

The pollutants that are likely to be present in an industrial environment are?

• A. H2S,SO2 and oxides of nitrogen
• B. NH3, HCI and CO
• C. CO2, NH3 and H2S
• D. dust, NO and CI2

(a)(i) State three differences between electrovalent compound and covalent compound.

(ii) Name the type of chemical bonding involved in the formation of ammonium ion from ammonia.

(b)(i) Name the quantum numbers which define an electron within an atom.

(ii) State the orbital in which the fifth electron of an atom is most likely to be found. Sketch the shape of the orbital.

(iii) State the period and the group to which the element boron belongs in the Periodic Table.

(c)(i) What is meant by the entropy of a chemical system?

(ii) Calculate the free energy change for a given reaction at 300 K using the following data obtained for the reaction: \(\Delta\) = -710KJ mol\(^{-1}\); \(\Delta\)S = 0.15 KJ mol\(^{-1}\)K\(^{-1}\)

(iii) From your evaluation in (c)(i) above, state whether the reaction is spontaneous or not at the given temperature. Give reason for your answer.

Polystyrene is widely used as packaging materials for fragile objects during transportation because of its

• A) ligjtness
• B) low density
• C) high density
• D) high compressibility

CH₄ has this geometry:

• A) trigonal
• B) planar
• C) tetrahedral
• D) octahedral

The oxidation number of iodine in the iodate ion (IO^-3) is

• A. -5
• B. -1
• C. +1
• D. +5

Tetraoxosulphate (VI) acid burns the skin by

• A. Hydrolysis
• B. Hydration
• C. Heating D. Dehydration C. Heating
• D. Dehydration

Consider the reaction represented by the equation: 2NaHCO₃ → Na₂CO₃+ H₂O + CO₂ What is the mass of sodium trioxocarbonate (lV) produced by the complete decomposition of 33.6 g of sodium hydrogen trioxocarbonate (IV)? [NaHCO3 = 84, Na2CO3 = 106]

• A. 10.6 g
• B. 16.8 g
• C. 21.2 g
• D. 42.4 g

What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution? [ F = 96 5000 C mol-1 ]

• A. 24 125 coulombs
• B. 48 250 coulombs
• C. 72 375 coulombs
• D. 96 500 coulombs