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Chemistry Past Questions

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1401

20 cm\(^3\) of hydrogen gas are sparked with 20cm\(^3\) of oxygen gas in an endimoeter at 373k (100\(^0\)C) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 oC) and passed over calcium chloride. The volume of the residual gas is

  • A. 40 cm 3
  • B. 20 cm 3
  • C. 30 cm 3
  • D. 10cm 3
  • E. 5cm 3
View Answer & Discuss (19) JAMB 1984
1402

For the reaction NH4NO2 \(\to\) N2 + 2H2O, calculate the volume of nitrogen that would be produced at S. T. P from 3.2 g of the dioxonitrate(iii)salt. (Relative atomic masses: N = 14, O = 16, H = 1)

  • A. 2.24 dm 3
  • B. 2.24 cm3
  • C. 1. 123
  • D. 1. 12dm 3
  • E. 4. 48 dm 3
View Answer & Discuss (9) JAMB 1984
1403

A molar solution of caustic soda is prepared by dissolving

  • A. 40 g NaOH in 100 g of water
  • B. 40 g NaOH in 1000 g of water
  • C. 20 g NaOH in 500 of solution
  • D. 20 g NaOH in 1000 g of solution
  • E. 2o g NaOH in 80 g of solution
View Answer & Discuss (8) JAMB 1984
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1404
Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?
  • A. 1 and 2
  • B. 2 and 3
  • C. 3 and 4
  • D. 1, 2, and 3
  • E. 2, 3, and 5
View Answer & Discuss (26) JAMB 1984
1405
Naphthalene when heated melts at 354 K (81 oC). At this temperature the molecules of naphthalene
  • A. decompose into smaller molecules
  • B. change their shape
  • C. are oxidized by atmospheric oxygen
  • D. contract
  • E. become mobile as the inter molecular forces are broken
View Answer & Discuss JAMB 1984
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