CHEMISTRY EXAM FORM THREE

NAME ____________________________________________________________________  

TIME: 3HRS.

INSTRUCTIONS

i)This paper consists of sections A, B and C

ii) Attempt all questions in all sections

iii) Calculators, and cellular phones are NOT allowed

iv) The following Constants may be used.

Atomic Masses:

H = 1,    C = 12,     O = 16,    N = 14,   Na = 23

Mg = 24,   Al = 27,    S = 32,    Cl = 35.5,    Ca = 40,    Cu = 64,     Ag = 108

1 Faraday = 96500C

1 Litre = 1dm3 = 1000cm3

GMV at S.T.P = 22.4dm3

SECTION A (20 MARKS)

1. For each of the items, (i) – (x).  Choose the correct answer from the alternatives given and write a letter of your choice besides the item number.

1. Loose and Floppy clothing is not allowed is the Laboratory because:

1. Movement has to be fast
2. Will get wet when water splashes
3. It can catch fire or cause one to fall
4. It cause poor ventilation to the body

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2. The equation X2+(aq)  + 2e -         X, represents

1. Oxidation reaction
2. Reduction reaction
3. Displacement reaction
4. Neutralization reaction
5.                                                                                                                                  ( )

3. Which of the following statements about the hardness of water is not true?

1. Soft water readily forms lather with soap
2. Hard water does not reading form lather with soap
3. Permanent hardness of water is due to Sulphates of Calcium and Magnesium
4. Permanent hardness of water becomes soft in boiling.

                                                                                                                               ( )

4. Reaction between substance  A and B forms C, is referred to as;

1. Physical charge
2. Chemical change
3. Mixture
4. Dissociation

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5. 0.5g of hydrogen gas is exploded in air to produce water vapour the mass of water formed is;

1. 0.75g
2. 4.0g
3. 18g
4. 4.5g

                                                                                                                                 ( )

6. What volume of 0.2M H2SO4 will be required to neutralize 25cm5 0.5M KOH?

1. 3.125cm3
2. 6.125cm3
3. 6.315cm3
4. 31/25cm3

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7. An element P with atomic number 13 belongs to group – and period -----

1. II and 2
2. III and 3
3. III and 2
4. II and 3

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8. Precipitation reaction can be represented by the following equation

1. Ba2+ (aq)  +  SO42- (aq)   BaSO4(s)

2. H+ (aq)  + OH – (aq)   H2O(l)

3. Na+ (aq)   + Cl – (aq) Nacl (aq)

4. 2KCl O3 (s) MnO2 2Kcl )s)   + 3O2 (g)

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