Chemistry Past Questions and Answers

Which are the correct IUPAC names for H-CO\(_2\)CH\(_3\) and CH \(\equiv\) CH

A Methyl methanoate and ethene
B Metanoic acid and ethyne
C Ethyl methanoate and ethyne
D Methyl methanoate and ethyne
E Ethanoic acid and ethene

Question 112:

Which of the following substances are all made by the process of polymerization?

A Nylon and soap
B Ethanoic acid margarine and ethanol
C Nylon and artificial rubber
D Soap and butane
E Margarine and nylon

Question 113:

The reaction of zinc with copper (ll) ions in aqueous solution can be represented as follows: Cu <sup style='font-size: smaller;'>2+</sup>(aq) +Zn (s) â†’ Cu(s) + Zn <sup style='font-size: smaller;'>2+</sup>(aq).Which of the following is the most complete description of this reaction?

A Cpper (ll) ions are being reduced
B Zinc is being oxidized.
C Copper (ll) ions and zinc are being reduced
D Copper (ll) ions and zinc are being oxidized
E Copper(ll) ions are being reduced and zinc oxidized

Question 114:

The oxidation state of manganese in potassium permanganate is

A +7
B +5
C +3
D +2
E +1

Question 115:

When carbondioxide is bubbled into limewater a white precipitate is formed. If the passage of the gas is continued, the precipitate disappears. The reason for this is

A Calcium carbonate is formed which on reaction dissolves
B Calcium hydrogen carbonate is precipitated and then dissolves
C Calcium carbonate is formed which on reaction with further carbondioxide forms solube calcium hydrogen carbonate
D Concentration of the solution has occurred with the deposition of calcium hydroxide
E The solution has become saturated and solid carbondioxide has been deposited