DEMO|PAPER 406-QNS

 

TEMEKE MUNICIPAL COUNCIL

SECONDARY SCHOOL

FORM THREE TERMINAL EXAMINATION AUGUST-2020

CHEMISTRY 1 Code: 032/1

Time: 3:00HRS Date: AUGUST,2020

INSTRUCTIONS

1. This paper consists of sections A, B and C with a total of 14 questions.

2. Answer all questions in sections A and B and one question from section C

3. Cellular phones and any unauthorised materials are not allowed in the examination room.

4. Write your name and stream on every page of your answer booklet(s).

5. The following constants may be used.

   • Atomic masses: H = 1, C = 12, O = 16, N = 14, Na = 23, Mg = 24, Cl = 35.5, Ca = 40,  Avogadro’s number = 6.02 x10 .

   • GMV at S.T.P = 22.4𝑑𝑚 .

   • 1 Faraday = 96,500 coulombs.

   • Standard pressure = 760 mm Hg.

   • Standard temperature = 273 K.

   • 1 litre = 1𝑑𝑚 = 1000𝑐𝑚

SECTION A (15 Marks)

1. 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.

1. Which of the following is the electronic configuration of an element Y found in period 3 and group II of the periodic table?

2 ∶ 8 2 ∶ 8 ∶ 2

2 ∶ 8 ∶ 8 ∶ 2 2 ∶ 8 ∶ 4

100. 2 ∶ 6

2. The apparatus suitable for measuring specific volumes of liquids is called ….

Burette Volumetric flask

Measuring cylinder Graduated beaker

100. Pipette

3. Which among the following the reaction,

𝐶𝑢 _{( )} + 𝑍𝑛_{( )} → 𝑍𝑛 _{( )} + 𝐶𝑢_{( )} represents:

1. Synthesis D. Displacement

2. Precipitation E. Decomposition

3. Neutralization

3. Boiling of permanent hard water may increase hardness of water because

   1. Boiling does not form carbonate ions

   2. Formation of vapour reduces volume of water in a container

   3. It forms other substances that make water to be hard

   4. It produces more sulphate ions because minerals become more soluble

   5. It produces scum with hard water

4. Which of the following compounds contains only two elements?

   1. Magnesium hydroxide D. Magnesium sulphite

   2. Magnesium nitride E. Magnesium sulphate

   3. Magnesium phosphate

5. A mixture of ammonium chloride salt and sand can be separated by using a method known as

   1. Evaporation D. Sublimation

   2. Sorting E. Decantation

   3. Fractional distillation

6. Which type of a fire is associated with electrical equipment?

   1. Class E D. Class B

   2. Class C E. Class A

   3. Class F

7. Hygroscopic and deliquescent substances can be used as

   1. Oxidizing agents D. Weak electrolytes

   2. Reducing agents E. Drying agents

   3. Catalysts

8. What will be the molarity of a solution which contains 26.5𝑔 of anhydrous sodium carbonates in 5 litres of solution?

1. 0.05M D. 0.50M

2. 0.025M E. 0.02M

3. 0.25M

3. Compound formed by partial replacement of the replaceable hydrogen from an acid is called:

1. Normal salt D. An alkali

2. Acidic salt E. Double salt

3. Basic salt

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