THE UNITED REPUBLIC OF TANZANIA MINISTRY OF EDUCATION AND VOCATIONAL TRAINING

FORM TWO SECONDARY EDUCATION EXAMINATION, 2008

0032 CHEMISTRY

TIME: 2 HOURS

INSTRUCTIONS

1. This paper consists of three sections A, B and C.

2. Answer all questions in spaces provided for each question.

3. Write your examination number on the top right hand corner of every page.

4. All writing must be done in “black or blue pen” except for the diagrams which must be in pencil.

5. Cellphones and calculators are not allowed in the examination room.

6. The following constants may be used:

Atomic masses: H = 1, C = 12, O = 16, and Na = 23.

SECTION A

1. Write down the letter corresponding to the most correct answer for each question.

(i) Separation of a mixture by fractional distillation is possible if the mixture constituents differ in their:

1. Boiling points
2. Melting points
3. Vapourizing points
4. Freezing points

(ii) The valency of an element with atomic number 10 is:

1. 2
2. 3
3. 0
4. 1

(iii) When element T of Group I combines with element X of Group VI, the formula of the compound formed is:

1. T₂X 
2. X₂T
3. TX₂
4. XT₄

(iv) A metal atom can become an ion by electron:

1. Attraction 
2. Gain
3. Loss 
4. Sharing

(v) How many protons, neutrons and electrons are there in an atom represented by the symbol ³⁹₁₉K?

(vi) Which of the following warning signs is likely to appear on the bottle containing concentrated nitric acid in the laboratory? 

1. Corrosive
2. Explosive
3. Flammable
4. Irritant

(vii) Saturated solution is one which:

1. Contains more solute undissolved at a given temperature.
2. Will take no more of solute at a given temperature.
3. Contains a little solute at a given temperature.
4. Has a large amount of solvent at a given temperature.

(viii)The percentage of C in C₂H₆ is:

1. 20 
2. 40
3. 60
4. 80

(ix) Which of the following electronic configurations are of metals?

1. 2:8:8:1 and 2:8:8:7
2. 2:8:3 and 2:8
3. 2:8:8:1 and 2:8:3
4. 2:8:6 and 2:8:8:7

(x) Hard water which can be softened by boiling method contains dissolved:

1. calcium carbonate 
2. calcium sulphate
3. magnesium chloride 
4. magnesium hydrogen carbonate