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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 106:

The electronic configuration 1s^{2 2}2s ²2p ⁶3s²3p ⁶ is that of a

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A Noble gas
B Group ll element
C Group lll element
D Group V element
E Group VI element

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Question 107:

The heat accompanying the reaction represented by the equation H₂O _(l) â†’ H ₂O_(g) is described as the heat of

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A Solution
B Neutralization
C Vaporization
D Sublimation
E Activation

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Question 108:

Aluminum is above iron in the electrochemical series, yet iron corrodes easily on exposure to air while aluminium does not. This is because aluminium

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A Has a lower density than iron
B Is a better conductor than iron
C Does not corrode spontaneously
D Forms thin layer of inert oxide in moist air
E Forms amphoteric oxides while iron does not

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Question 109:

When a solid melts and consequently boils, there is

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A A gradual increase in the average kinetic energy of the particles
B A sudden decrease in the kinetic energy of the particles
C No change in the average kinetic energy of the particles
D A rapid change in the nature of bonding of the com[onents
E A change in the size of the fundamental particles

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Question 110:

Which of the following compounds will undergo additional reactions?

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A Ethyne
B Butane
C Pentane
D Tetrachloromethane
E Ethanol

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