Methanoic acid mixes with water in all proportions and has about the same boiling point as water which of the following methods would you adopt to obtain pure water from a mixture of stand, water and methanoic acid?
- A. fractional distillation
- B. filtration followed by distillation
- C. neutralization with sodium hydroxide followed by distillation
- D. esterification with ethanol followed by distillation
- E. neutralization with sodium hydroxide followed by filtration
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
The oxidation state of manganese in potassium permanganate is
- A. +7
- B. +5
- C. +3
- D. +2
- E. +1
The reaction of zinc with copper (ll) ions in aqueous solution can be represented as follows: Cu 2+(aq) +Zn (s) → Cu(s) + Zn 2+(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
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
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
An organic compound X has the following properties: I. It is not miscible with water. ll. lt has boiling point of 77oC lll. lt has a sweet odour lV. lt is insoluble in sodium hydrogen carbonate solution . V lt does not decolourize bromine water X is therefore
- A. methane
- B. ethanoic acid
- C. ethene
- D. ethyl ethanoate
- E. carbon tetrachloride