THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

032/1 CHEMISTRY 1

(For Both School and Private Candidates)

Time: 3 Hours Year: 2022

Instructions

1. This paper consists of sections A, B and C with a total of fourteen (14) questions.
2. Answer all questions in sections A and B and one (1) question from section C.
3. Section A and C carry fifteen (15) marks each and section B carries seventy (70) marks.
4. Non - programmable calculators may be used.
5. Cellular phones and any unauthorised materials are not allowed in the examination room.
6. Write your Examination Number on every page of your answer booklet(s).
7. The following constants may be used.

• Atomic masses: H = l, C = 12, N =14, O =16, Na =23.
• Avogadro's number 6.02 x 10²³ GMV at s.t.p 22.4 dm³ .
• 1 Faraday = 96,500 coulombs.
• 1 litre I= 1m³ = 1000 cm³.

SECTION A (15 Marks)

Answer all questions in this section.

l. For each of the items (i) - (x), choose the correct answer from the given alternatives and write its letter beside the item number in the answer booklet provided.

(i) Which is a chemical property of water?

1. It is a very good solvent.
2. It is neither acidic nor basic.
3. It has higher surface tension.
4. It can exist in three states of matter.
5. It expands when it freezes

(ii) What is the maximum number of electrons in the innermost shell of atoms?

1. 3
2. 1
3. 4
4. 2
5. 8

(iii) What feature is essential for a good fuel?

1. High speed of continuous energy supply.
2. High energy value supplied.
3. Low carbon dioxide supplied.
4. High carbon dioxide production.
5. High content of non-combustible material.

(iv) What conclusion can be drawn from the random movement of pollen grains suspended in air?

1. Matter is lighter in nature.
2. Matter is solid in nature.
3. Matter is particulate in nature.
4. Matter is gaseous in nature.
5. Matter is wave in nature.

(v) Which energy source that can be reused after being exploited?

1. Combustible source.
2. Non-renewable source.
3. Renewable source.
4. Synthetic source.
5. Natural source.

(vi) Which one is the molecular formula for prop-I -ene?

1. C₃H₅
2. CH₃CCH
3. C₃H₄
4. HCH₂CCH
5. CH₃CHCH₂

(vii) Which of the following is not a component of the First Aid Kit?

1. Goggles
2. A pair of scissors
3. Knife
4. Gloves
5. Razor blade

(viii) Which element is oxidised in the following reaction?

2FeSO₄ +CI₂ +H₂SO₄ → Fe(SO₄)₃+ 2HCl.

1. Chlorine
2. Hydrogen
3. Oxygen
4. Sulphur
5. Iron

(ix) Which of the following are the components needed to start fire?

1. Match box, fire wood and kerosene
2. Match box, fire wood and oxygen
3. Oxygen, fuel and fire wood
4. Oxygen, heat and match box
5. Oxygen, fuel and heat

(x) Why is nitrogen formed first during the fractional distillation of air?

1. It has got high boiling point.
2. It has got low density.
3. It has got low melting point.
4. It has got high density.
5. It has got low boiling point.