Chemistry Past Questions, Answers & Explanations For JAMB, WAEC, NECO & Post UTME - Chemistry

The following graph demonstrates the rate of reaction between calcium carbonate (marble)and dilute hydrochloric acid. The graph shows that the rate of reaction is initially greatest when

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A The initial slope of the curve is steepest and this occur when small pieces of marble are used and is due to a small surface area of reactant
B The occur when large pieces of marble are used and is due to a small surface area of reactant
C The initial slope of the curve is steepest and this occurs when small pieces of marble are used and is due to a large surface area of reactant
D The initial slope of the curve is steepest and this occur when large surface area of reactant
E The initial slope of the curve is least steep and this occur when small pieces of marble are used and is due to the increased surface area of the reactant

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Question 200:

JAMB 1980

Copper sulphate solution was electrolysed using the apparatus show above. Which of the following changes are observed?

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A The bulb lights and copper is deposited at both electrodes
B The bulb lights and copper is deposited at the anode and disappears from the cathode
C The bulb lights and copper is deposited at the cathode and oxygen liberated at the anode
D The bulb lights and copper is deposited at the cathode and disappears from the anode
E The bulb lights but no additional changes are observed

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