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Chemistry Past Questions and Answers

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Chemistry Questions

Question 541:

Which of the followingstatements is TRUE?

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A The dissolution of NaOH_(s) in water is endothermic
B The heat os solution of NaOH_(s) is positive
C The NaOH_(s) gains heat from the surroundings
D The heat of solution of NaOH_(s) is negative

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Question 542:

Which property of a reversible reaction is affected by a catalyst?

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A Heat content (enthalphy)
B Energy of activation
C Free energy change
D Equilibrium position

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Question 543:

Which of the following is used in fire extinguishers?

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A Carbon (ll) oxide
B Carbon (lV) oxide
C Sulphur (lV) oxide
D Ammonia

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Question 544:

When H₂S gas is passed into a solution of iron (III) chloride, the colour changes from yellow to green. This is because?

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A H_(s)S is reduced to S
B Fe³⁺ ions are oxidized by H_(s)S
C Fe³⁺ ions are oxidized Fe³⁺ ions
D Fe³⁺ ions are reduced to Fe²⁺ ions

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Question 545:

Suitable reagents for the laboratory preparation nitrogen are?

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A Sodium dioxonitrate (III) and ammonium chloride
B Sodium dioxonitrate (V) and ammonium chloride
C Sodium chloride and ammonium chloride
D Sodium chloride and ammonium diozonitrate (III)

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