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Chemistry Past Questions and Answers

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Chemistry Questions

Question 181:

When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?

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A Turn moist red litmus paper blue
B Turn lime water milky
C Blacken lead acurate paper
D Rekindle a glowing splint
E Burn a sqeakly pop

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Question 182:

In which of the following is the oxidation state of oxygen different from its value in water?

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A OH<sup style='font-size: smaller;'>-</sup>
B H<sub style='font-size: smaller;'>3</sub>O<sup style='font-size: smaller;'>+</sup>
C O<sup style='font-size: smaller;'>-</sup>
D H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>2</sub>
E SO<sub style='font-size: smaller;'>2</sub>

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Question 183:

Which of the following silver halides is readily soluble in ammonium hydroxide?

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A Agl
B AgBr
C AgCl
D AgF
E None of the above

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Question 184:

The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?

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A Oxidation
B Hydrolysis
C Dissociation
D Reduction
E Disproportionation

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Question 185:

Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate?

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A Electrons flow towards the zinc rod
B The zinc rod dissolves
C The temperature of the soil changes
D The blue colour of the solution gradually disappears
E Copper metal is deposited

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