TOPIC: CHLORINE AND ITS COMPOUNDS
DIRECTION: Choose the correct options from the lettered options.
1.To test for chlorine ______ is used.
A.damp litmus paper and bromine paper
B.damp litmus paper and hydrogen sulphide
C. damp litmus paper and starch iodide paper
D. none of the above
The correct answer is option [C]
2. The following are physical properties of chlorine except ______
A. it cannot be liquefied.
B. it is denser than air.
C. it is sparingly soluble in water
D. it is poisonous
The correct answer is option [A].
3. Which of the products of these mixtures is acidic?
A. HCl(g) + chloroform.
B. HCl(g) + water.
C. HCl(g) + Zn.
D. HCl(g) + Mg.
The correct answer is option [B].
4. Why is a damp blue litmus paper placed at the mouth of a jar during the preparation of hydrogen chloride?
A. To determine the effect of the gas on the litmus paper
B. For the litmus paper to absorb the gas.
C.The litmus paper has no effect in the experiment.
D.To determine when the jar is full.
The correct answer is option [A].
5. What reagents are used to test for soluble chlorides?
A. Ammonia.
B. Acidified silver trioxonitrate.
C. Acidified lead (II) trioxonitrate.
D. Ammonia, acidified silver trioxonitrate and acidified lead (II) trioxonitrate.
The correct answer is option [D].
TOPIC: ELECTRODE POTENTIALS. ELECTROCHEMICAL SERIES. ELECTROLYSIS
DIRECTION: Choose the correct options from the lettered options.
1. An electrolyte conducts electricity only when ________ [i] molten. [ii] in solution. [iii] solid.
A. [i] only.
B. [ii] only.
C. [i] and [ii] only.
D. [i], [ii] and [iii] only.
The correct answer is option [C].
2. The law that states, the mass of an element discharged during an electrolysis is directly proportional to the quantity of electricity [Q] passing through it is _______
A. Faraday’s first law of electrolysis.
B. Faraday’s second law of electrolysis
C. Faraday’s third law of electrolysis
D. Faraday’s Zeroth law of electrolysis
The correct answer is option [A].
3. 0.05 Faraday of electricity is passed through acidulated water using platinum electrodes. What volume of each gas is evolved?
A. 0.56 dm3 of H2 and 0.28 dm3 of O2.
B. 1.12 dm3 of H2 and 0.56 dm3 of O2.
C. 0.224 dm3 of H2 and 0.112 dm3 of O2.
D. 2.24 dm3 of H2 and 4.48 dm3 of O2.
The correct answer is option [A]. Solution: First write one of the redox equation [i.e. for hydrogen]: 2H+ + 2e- → H2; 1 mole of hydrogen will be produced by 2F of electricity? mole of hydrogen will be produced by 0.05F electricity → 0.05/2 = 0.025 moles; 1 mole of a gas gives 22.4 dm3, then 0.025 moles gives 0.025×22.4 = 0.56 dm3 of hydrogen and oxygen is half the volume of hydrogen which is 0.28 dm3.
4. Zinc easily displaces copper from copper [II] salt solution but lead will not displace copper from copper [II] salt.
Which options best explains the statement?
A.Zinc is placed far below copper in the activity series.
B.Lead is placed far above copper in the activity series.
C. Zinc is placed far above copper in the activity series.
D. Copper is placed far above zinc in the activity series.
The correct answer is option [C]. Reason: The further apart they are in the activity series, the easier it is for
5. In an electrochemical cell, reduction always occur ________
A. at the cathode.
B. at the anode.
C. in the electrolyte.
D. none of the above.
The correct answer is option [A].
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