Which of the following metals will liberate hydrogen from steam or dilute acid?

• A. Copper
• B. Iron
• C. Lead
• D. Mercury

What volume of distilled water should be added to 400cm3 of 2.0 mole^dm-3 H₂SO₄to obtain 0.20 mole dm-3 of solution>

• A. 600cm³
• B. 800cm³
• C. 1,000cm³
• D. 3,600cm³

When concentrated sodium chloride solution is electrolysed using inert electrodes the products are

• A. oxygen and hydrogen
• B. hydrogen and oxygen
• C. sodium and oxygen
• D. soduim and chlorine

(a)(i) Explain what is meant by an effective collision

(ii) What does each term represent in the following expression? \(\Delta G\) = \(\Delta H\) — T\(\Delta\)S

(iii) What deduction can be made about a system given that the value of its \(\Delta\)G is zero?

(b)(i) State Le Chatelier's principle.

(ii) Suggest three conditions necessary for maximum yield of A\(_2\)B in the reaction represented by the following equation 2A\(_{2(g)}\) + B\(_{2(g)}\) \(\rightleftharpoons\) 2A\(_2\)B\(_{(g)}\) \(\Delta\)H = xkj.

(iii) Write an expression for the equilibrium constant of the reaction in (b)(ii) above.

(c)(i) Give the reason why a log of wood of a given mass does not burn out as quickly as sawdust of the same mass, under the same conditions.

(iii) List two examples of chemical reactions that are catalyzed by light

Which of the flowerig is/are true of elements in the Periodic Table?

• I. All elements in the same period have atoms A. with the same number of main electronic shells.
• B. The atoms of the elements are arranged in order of increasing number of electrons.
• C. All of the options
• D. All the elements in the same group have the same number of electrons in the outemast shells.

Consider the equilibrium reaction represented by the equation: 2SO₂(g) + O(g) ⇌ 2SO₃(g) ΔH = - 197 kJmol-1. At equilibrium, increase in the total pressure of the system brings about

• A. decrease in rate of the reaction of the system
• B. decrease in temperature of the system
• C. increase in temperature of SO₃
• D. increase in concentration of SO₂

When water boilers are used for long period of time, the solid substances left behind as scale are

• A. magnesium trioxosilicate (IV) and rust
• B. magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI)
• C. clay and magnesium troxosulphate (IV)
• D. clay and rust

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

• A. 0.097 mm
• B. 0.194 mm
• C. 0.388 mm
• D. 2.388 mm

Saponification is defined as:

• A) Acidic hydrolysis of fat or oil
• B) Alkali hydrolysis of fat or oil
• C) Condensation of two monomer units
• D) Mixture of glacial ethanoic acid and excess of simple alkanol

In the industrial production of H₂ from natural gas the CO₂ produced along with the H₂ is removed by

• A. washing under pressure
• B. drying over phosphorus (V) oxide
• C. passing the mixture into lime water
• D. using ammonical copper (I) chloride