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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 1:

Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?

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A Netralization with NaOHfoolowed by filtration
B Neutralization with NaOH followed by distillation
C Fractional distillation
D Filtration followed by distillation

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Question 2:

Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?

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A Netralization with NaOHfoolowed by filtration
B Neutralization with NaOH followed by distillation
C Fractional distillation
D Filtration followed by distillation

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Question 3:

How many atoms are present in 6.0g of magnesium?
[Mg = 24, N_A = 6.02 x 10²³ mol^-1]

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A 1.20 x 10²²
B 2.41 x 10²²
C 1.51 x 10²³
D 3.02 x 10²³

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Question 4:

50 cm³ of gas was collected over water at 10^oC and 765 mm Hg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at 10 ^oC is 5mm Hg

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A 49.19 cm ³
B 48.87 cm ³
C 48.55 cm ³
D 48.23 cm ³

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Question 5:

An increase in the pressure exerted on gas at a constant temperature results in

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A A decrease in the number of effective collisions
B A decrease in volume
C An increase in the average intermolecular distance
D An increase in volume

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