200cm3 each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated. [Pb = 207, Cl= 35.5, N = 14, O = 16]

• A. 2.78g
• B. 5.56g
• C. 8.34g
• D. 11.12g

The strength of metallic bonds depends on the

• A. charge density of the atoms
• B. ductility of the metal
• C. number of valence electrons
• D. total number of electrons in the atom

The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is – (Ag = 108 F = 96500(mol^-1)

• A) 54.0g
• B) 27.0g
• C) 13.5g
• D) 108.0g

Sodium metal is always kept under oil because it

• A. Readily reacts with water
• B. Is reduced by atmospheric nitrogen
• C. Reacts vigorously on exposure to air
• D. Reacts with oxygen and carbon (IV) oxide

Which of the following electron configurations indicates an atom with the highest ionization energy?

• A. 2,8,7
• B. 2,8,8,1
• C. 2,8,8,2
• D. 2,8,8,7

A sample of air was bubbled into water. The PH of the water slowly changed from 7 to 6. Which of the following gases in the samples caused the change?

• A. carbon(iv)oxide
• B. carbon(ii)oxide
• C. nitrogen
• D. oxygen

crude oil spillage on a river can be dispersed by spraying the water with

• A. disinfectant
• B. kerosene
• C. Ammonia
• D. detergent

a) (i) Describe, using the kinetic theory of matter, what happens when potassium chloride dissolves in water.

(ii) Give a reason why the process in (a) (i) is endothermic.

(b) (i) An underground iron pipe is less likely to corrode if it is bonded at intervals with magnesium rods. Give reasons for this observation.

(ii) State the stages involved in the rusting of iron.

(iii) State the condition for the rusting of iron in water.

(c) (i) What is aspontaneous reaction?

(ii) Statetwo conditions that could make a reaction spontaneous.

(iii) Explainbriefly why onegramme of sodium reacts more rapidly with water at 250C than onegramme of calcium at the same temperature.

(iv) Write equations for the reactions in(c)(iii).

(d) What mass of lead (II) trioxocarbonate (IV) would contain 35.0 g of lead?

[C=12.0, O = 16.0, Pb = 207.0]

(e) Name the type of intermolecular force present in:

(i) fluorine;

(ii) hydrogen fluoride.

An arrangement of two different metals in aqueous solutions of their salts to produce an electronic current is known as

• A. electrochemical cell
• B. activity series
• C. thermocouple
• D. voltameter

Which of the following gases is the most dangerous pollutant?

• A. Hydrogen sulphide
• B. Carbon (lV) oxide
• C. Sulphur (lV) oxide
• D. Carbon (ll) oxide