Christian Religious Knowledge/Education/Studies (CRS/CRK/CRE)
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Paper 1 | Objectives
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
B. ethanoic acid
D. ethyl ethanoate
E. carbon tetrachloride
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
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
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
The oxidation state of manganese in potassium permanganate is
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
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
Water added to an acid decreases its pH, hence, methanoic acid and water (azeotropes with very close boiling points) will be more acidic. Hence, addition of sodium hydroxide forms a salt and water. Then filtration can be done easily.