## JAMB 2008 : Chemistry

1Chlorophyll obtained from given leaves of plant can be shown to be composed of more than one coloured component by the technique of

• A. crystallization
• B. hydrolysis
• C. chromatography
• D. sublimation

2In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to

• A. lower the melting point of the ice
• B. increase the density of the ice
• C. make the ice impure
• D. raise the melting point of the ice

32Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.[H = 1, O = 16, Na = 23]

• A. 0.40g
• B. 0.80g
• C. 4.00g
• D. 8.00g

416.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off s.t.p [Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm3]

• A. 22.40 dm3
• B. 11.20 dm3
• C. 2.24 dm3
• D. 1.12 dm3

5300 cm3 of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume

• A. 243.75 cm3
• B. 369.23 cm3
• C. 738.46 cm3
• D. 1733.36 cm3

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