Jamb Chemistry Past Questions For Year 1999

Question 1

In the diagram above, the mixture of the solids P and Q can be separated by?

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• A. distillation
• B. fractional distillation
• C. crystallization
• D. fractional crystallization

Question 2

Use the table above to answer this question .The least reactive element is

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• A. W
• B. X
• C. Y
• D. Z

Question 3

Use the table above to answer this question . The element that is likely to participate in covalent rather than ionic bonding is

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• A. Z
• B. Y
• C. X
• D. W

Question 4

In the diagram above, Y is a mixture of

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• A. calcium hydroxide and ammonium chloride
• B. calcuim hydroxide and sodium chloride
• C. sodium chloride and ammonuim trioxonitrate (V)
• D. sodium dioxonitrate (lll) and ammouium chloride

Question 5

From the diagram above the mass of crystals deposited when 1 dm ³ of a saturated solution of NaCl is cooled from 80 ^oC to 60^oC is

[Na = 23, Cl = 35.5]

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• A. 117.00 g
• B. 58.50 g
• C. 11.70 g
• D. 5.85 g