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2826
The best way to distinguish between Na2CO3and NaHCO2 is by.
  • A. adding an acid.
  • B. adding an alkali.
  • C. dissolving in water.
  • D. exposing to air.
  • E. heating.
View Answer & Discuss (4) NECO 2001
2827
An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?
  • A. I and II
  • B. I and III
  • C. I and IV
  • D. II and III
  • E. II and IV
View Answer & Discuss NECO 2001
2828
Faraday s first law of electrolysis can be expressed mathematically as
  • A. m=I/it
  • B. mαit
  • C. Q=it
  • D. QαI/it
  • E. Qαit
View Answer & Discuss (7) NECO 2001
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2829
A gas X diffuse through porous partition at the rate of 3 cm3 per second. Under the same condition hydrogen diffused at the rate of 15 cm3 per second.

What is the 42. relative molecular mass of X.
  • A. 5
  • B. 12
  • C. 18
  • D. 45
  • E. 50
View Answer & Discuss (17) NECO 2001
2830
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by
  • A. conversion.
  • B. elimination.
  • C. oxidation.
  • D. reduction.
  • E. substitution.
View Answer & Discuss (1) NECO 2001
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