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Chemistry 1978 JAMB Past Questions

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6

Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

  • A. P will form an electrovalent bond with R
  • B. Q will form a covalent bond with S
  • C. R will form an electrovalent bond with S
  • D. Q will form an electrovalent bond with S
  • E. Q will form a covalent bond with R
View Answer & Discuss (72) JAMB 1978
7

An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the

  • A. law of multiple proportions
  • B. law of chemical proportions
  • C. law of simple proportions
  • D. law of conservation of mass
  • E. law of definite proportions
View Answer & Discuss (53) JAMB 1978
8

The oxidation state of chlorine in potassium chlorate is?

  • A. +1
  • B. +2
  • C. +3
  • D. +5
  • E. +7
View Answer & Discuss (140) JAMB 1978
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9

When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are?

  • A. nitrogen and carbondioxide
  • B. the rare gases
  • C. nitrogen and oxygen
  • D. nitrogen and the rare gases
  • E. nitrogen, carbondioxide and the rare gases
View Answer & Discuss (92) JAMB 1978
10
When heat is absorbed during a chemical reaction, the reaction is said to be
  • A. thermodynamic
  • B. exothermic
  • C. isothermal
  • D. endothermic
  • E. thermostatic
View Answer & Discuss (66) JAMB 1978
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