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1521
Liquid X, reacts with sodium trioxocarbonate (IV) (Na2CO3) to give a gas which turns calcium chloride solution milky X is
  • A. Na2SO4(aq)
  • B. Kl (aq)
  • C. an alkali
  • D. an acid
  • E. a hydrocarbon
View Answer & Discuss (5) JAMB 1983
1522
Which of the following statements is FALSE?
  • A. Copper (ll) ion can be reduced to copper (l) ion by hydrochloric acid and zinc
  • B. Sodium metal dissolves in water giving oxygen
  • C. Nitrogen is insoluble in water
  • D. Carbondioxide is soluble in water
  • E. lead has a higher atomic weight than copper
View Answer & Discuss (6) JAMB 1983
1523
When sodium dioxonitrate (lll) (NaNO2) dissolves in water, ∆H is positive. The process of dissolution is
  • A. exothermic
  • B. endothermic
  • C. isothermal
  • D. isomeric
  • E. hygroscopic
View Answer & Discuss (2) JAMB 1983
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1524
The equilibrium reaction between copper (l) chloride and chlorine at 25oC and 1 atmosphere is represented by the equation:
2CuCl +Cl2 ⇌ 2 CuCl2 ∆H = - 166 KJ. Which of the following statements is TRUE for the reaction, pressure remaining constant?
  • A. more CuCl is formed at 40oC
  • B. more CuCl2 is formed at 10oC
  • C. Less CuCl2 is formed at 10oC
  • D. there is no change in the amount of CuCl2 formed at 40oC and10oC
  • E. more CuCl is consumed at 40oC
View Answer & Discuss (13) JAMB 1983
1525
zn + 2HCl → ZnCl2 + H2

The rate of the above reaction will be greatly increased if
  • A. the zinc is in the powered form
  • B. a greater volume of the acid is used
  • C. a smaller volume of the acid is used
  • D. the reaction vessel is immersed in an ice-bath
  • E. the zinc is in the form of pellets
View Answer & Discuss (1) JAMB 1983
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