Correct Answer: D. kinetic energy

Correct Answer: C. makes the oil evaporate easily by dissolving it

Correct Answer: D. +5

Explanation

(a)(i) Oxide of non-metals which dissolve in water to form acidic solution.

(ii) 1. Acidic oxides:- SO\(_2\)/CO\(_2\)/NO\(_2\), etc.

2. Basic oxides:- CaO/Na\(_2\)O/K\(_2\)O, etc.

3. Amphoteric oxides:- Al\(_2\)O\(_3\)/ZnO/PbO, etc.

4. Neutral oxides:- CO/N\(_2\)O, etc.

(b)(i) Heat of combustion is the heat change when one mole of a substance is completely burnt in oxygen or burnt in excess oxygen

(ii) Heat of neutralization is the heat change when one mole of water is produced as a result of a reaction between an acid and alkali in dilLte solution or the heat change when one mole of H+ from an acid reacts with one mole of OH\(^-\) from an alkali to form one mole of H\(_2\)O.

(ii)1. C\(_{(g)}\) + O\(_{2(g)}\) \(\to\) CO\(_{2(g)}\)

2. HaOH\(_{(aq)}\) + HCl\(_{(aq)}\) \(\to\) NaCI + H\(_2\)O\(_{(l)}\) \(\Delta\) Hn\(^o\)

3. Molar mass of C\(_4\)H\(_{10}\) = 12 x 4 + 1 x 10

= 48 + 10 = 58g mol\(^{-1}\) .

58g of C\(_4\)H\(_{10}\) = 5877kJ mol\(^{-1}\)

14.5 of C\(_4\)H\(_{10}\) = \(\frac{5877 \times 14}{58}\) kJ mol\(^{-1}\)

= + 1469.25 kJ.

(c)(i) Rhombic

Monoclinic

(d)(i)(a) They are monoatomic gases

(b) They are chemically unreactive

(c) Have low melting/boiling point.

(ii) He — filling balloons. Ar — arc welding.

Correct Answer: D. Potassium oxide

Correct Answer: B. Sulphur

Correct Answer: B. 31.0

Correct Answer: B) There will be a large increase in free energy.

Explanation

In this question, we are given that the reaction is exothermic and there is a great disorder. We need to understand what these terms mean and how they relate to free energy change in a reaction.

Anexothermic reaction is a reaction that releases heat to the surroundings. In such reactions, the energy of the products is less than the energy of the reactants, which means that the overall change in energy is negative (?H < 0).

Disorder in a reaction refers to the entropy change (?S). A great disorder implies that there is a large increase in entropy, which means that the products are more disordered than the reactants. A significant increase in entropy is associated with a positive value of ?S.

Now, let's consider the concept offree energy (?G), which determines the spontaneity of a reaction. The relationship between free energy, enthalpy, and entropy is given by the following equation:

\[\Delta G = \Delta H - T\Delta S\]

Where ?G is the free energy change, ?H is the enthalpy change, T is the temperature in Kelvin, and ?S is the entropy change. A negative value of ?G indicates a spontaneous reaction, while a positive value indicates a non-spontaneous reaction.

Since the reaction is exothermic (?H 0), the equation becomes:

This implies that there will be a large increase in free energy (?G > 0), which corresponds toOption B.

Correct Answer: D. Nz, Mg, S and Ar

Correct Answer: D. sublimation