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Chemistry Past Questions and Answers

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Chemistry Questions

Question 4041:

Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below?

M(s)+2HC1(aq) → MCI₂ (aq) + H₂(g)

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A Adding some distilled water
B Decreasing the temperature
C Diluting the hydrochloric acid
D Grinding the metal into powder
E Increasing the pressure

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Question 4042:

Which of the following is a component of the car exhaust?

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A Aluminium
B Calcium
C Iron
D Zinc
E Lead

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Question 4043:

The molecular formula of ethylbutanoate is?

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A C_{[/sub]H[sub]5}COOC₂6
B C₃H_{[/sub]COOC[sub]2}H₇
C C₃H₇COOC₃H₇
D C₃H₇COOC₄H₉
E C₃H₇COOC₂H₅

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Question 4044:

The rate of a chemical reaction is NOT affected by one of these factors

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A Colour
B Concentration
C Presence of light
D Surface area
E Temperature

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Question 4045:

Pipe-borne water is usually chlorinated in order to ____________

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A Coagulate sediments in the water
B Improve taste of the water
C Kill harmful bacteria in the water
D Make it pure
E Remove the hardness in the water

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