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1061

An efflorescent compound is a substance that?

  • A. absorbs water froom the air without dissolving in it
  • B. is capable of giving off coloured luminosity
  • C. gives out water to the atmosphere
  • D. absorbs water from the air and dissolves in it
  • E. gives out its water of crystallization on heating
View Answer & Discuss (17) JAMB 1981
1062
The general formula of an alkyl halide (which represent the halide) is?
  • A. CnH2n - 2X
  • B. CnH2n + 1X
  • C. CnH2n + 2X
  • D. CnH2nX
  • E. CnH2n - 1
View Answer & Discuss (1) JAMB 1981
1063
A mixture contains 20cm3 of hydrogen, 35cm3 of oxygen, 15cm3 of carbon monoxide and 10cm3 of nitrogen at S.T.P. Which of the following gives the mole fraction of hydrogen in this mixture?
  • A. 0.02
  • B. 0.16
  • C. 0.20
  • D. 0.25
  • E. 20
View Answer & Discuss (6) JAMB 1982
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1064

0.07g of a hydride of carbon occupies 56.0cm\(^3\) at S.T.P. When vaporized and contains 14.29% by mass of hydrogen. The formula of the hydrocarbon is(C = 12, H = 1)

  • A. CH4
  • B. C2H2
  • C. C2H4
  • D. C2H6
  • E. C3H8
View Answer & Discuss (31) JAMB 1982
1065
The pressure on 100 cm3 of oxygen gas at 35°C is 750mm of Hg.What would be the volume of the gas if the pressure is increased to 1000mm of Hg without changing the temperature?
  • A. 133.3 cm3
  • B. 85 cm3
  • C. 75 cm3
  • D. 65 cm3
  • E. 58.3 cm3
View Answer & Discuss (8) JAMB 1982
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