Candidate's Examination Number. . . . . . . . . . . . . . . .

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA 

FORM TWO NATIONAL ASSESSMENT

032 CHEMISTRY

Time: 2:30 Hours Year: 2024

Instructions

1. This paper consists of sections A, B and C with a total of ten (10) questions.
2. Answer all the questions in each section.
3. All answers must be written in the spaces provided.
4. All writing must be in blue or black ink, except drawings which must be in pencil.
5. Communication devices and any unauthorized materials are not allowed in the assessment room.
6. Write your Assessment Number at the top right corner of every page.
7. Where necessary the following constants may be used: H=1, C=12, O=16

SECTION A (15 Marks)
Answer all questions in this section.

1.For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter in the box provided.

(i) How are the different atoms which occupy the same group and period called?

1. Isotopes
2. Isomers 
3. Monomers
4. Isobers

(ii) Which one of the following is not a suitable means of separating the components of air?

1. Chemical means 
2. Physical means
3. Freezing method
4. Precipitation method

(iii) Which source of flame produces a non-luminous flame?

1. Candle
2. Kerosene stove
3. Tin lamp
4. Bunsen burner

(iv) How can water be changed from vapour to liquid state?

1. By sublimation 
2. By evaporation
3. By melting 
4. By condensation

(v) Why is water regarded as the universal solvent? 

1. Because it is found all over the world
2. Because it contain hydrogen and oxygen elements
3. Because most of substances dissolve in it
4. Because it contains a variety of minerals

(vi) What is the total number of electrons in hypothetical ion Q²⁺ whose atomic number is 12? 

1. 12
2. 14
3. 10 
4. 24

(vii) Which one of the following is not a part of the Bunsen burner?

1. Jet
2. Barrel
3. Gas tap
4. Air hole

(viii) Which apparatus serves the function of stirring substances?

1.  Desiccator
2. Glass rod
3. Spatula
4. Deflagrating spoon

(ix) How can contaminants be removed from water'?

1. Through purification
2. Through sedimentation
3. Through electrolysis
4. Through decantation

(x) How many protons are there in a molecule of oxygen gas?

1. 8
2. 17
3. 9
4. 16