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1071
In the preparation of carbon monoxide by heating ethanedioic acid with concentrated sulphuric acid, the concentrated sulphuric acid act as?
  • A. an oxidizing agent
  • B. a reducing agent
  • C. a dehydrating agent
  • D. a reaction medium
  • E. a catalyst
View Answer & Discuss (2) JAMB 1982
1072
When copper powder is heated with concentrated sulphuric acid, the gas produced is?
  • A. hydrogen sulphide
  • B. sulphur dioxide
  • C. sulphur trioxide
  • D. hydrogen pentasulphide
  • E. sulphur pentoxide
View Answer & Discuss (7) JAMB 1982
1073
Magnesium ribbon was added to each of the following aqueous solution in turn: H2SO4, AgNO3, HNO3, HCl, NH3, HCl, NH3. In which case does the magnesium become covered with a dark precipitate?
  • A. H2SO4
  • B. AgNO3
  • C. HNO3
  • D. NH3
  • E. HCl
View Answer & Discuss (10) JAMB 1982
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1074

How many grams of methylacetylene (propyne) CH\(_3\) — C Ξ CH will completely discharge the colour of 8g of bromine?
(Br = 80, C = 12, H = 1)

  • A. 0.5
  • B. 1.0
  • C. 2.0
  • D. 3.0
  • E. 4.0
View Answer & Discuss (18) JAMB 1982
1075

What weight of sodium hydroxide is required to make 500 cm\(^3\) of 0.2 M solution?

(Na = 23, O = 16, H = 1)

  • A. 40 g
  • B. 20 g
  • C. 10 g
  • D. 4 g
  • E. 2 g
View Answer & Discuss (16) JAMB 1982
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