Question 21 : Which three of the following are properties of alkynes?
1. They are all soluble in water.
2. Alkynes have similar physical properties.
3. The lower members are gases at normal temperatures and pressures.
4. Alkynes are soluble in non-polar solvents like methylbenzene.
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Question 22 : What is the main component of natural gas?
1. Methane
2. Ethane
3. Ethene
4. Propane
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Question 23 : In hydrocarbons, the C and H bonds are joined together by
1. ionic bonds
2. hydrogen bonds
3. dipole-dipole attractions
4. covalent ions
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Question 24 : How can you determine if a reaction is endothermic?
1. The temperature of the system decreases.
2. The temperature of the system increases.
3. The temperature of the system remains constant.
4. The temperature of the system fluctuates
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Question 25 : Organic compounds are separated into groups called homologous series. Which one of the following is not a property of a homologous series?
1. All members have the same general formula.
2. Successive members differ by CH
3. They have similar chemical properties.
4. They have similar physical properties.
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Question 26 : One of the raw materials used in preparing ethyne (C2H2) contains a number of impurities. Two of these impurities are
1. calcium carbonate and calcium phosphide
2. copper sulfate and calcium phosphide
3. calcium sulfide and calcium phosphide
4. calcium sulfide and hydrochloric acid
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Question 27 : The ethyne produced in the laboratory contains two known impurities which are removed by passing them through an acidified copper sulfate solution. These impurities are
1. hydrogen sulfate and phosphine
2. copper sulfide and potassium
3. hydrogen sulfide and phosphine
4. hydrogen sulfide and potassium
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Question 28 : In a laboratory experiment, students tested the solubility of different solutes in methylbenzene. They made a table as shown. However, two of these results are incorrect. Select the two incorrect results from the list below
1. Cooking oil and water
2. Cyclohexane and iodine
3. Salt water and octane
4. Salt water and cyclohexane
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Question 29 : The general formula for the alkynes is
1. C_NH_2N+2
2. C_NH_2N
3. C_NH_2N-2
4. C_NH_2N+1
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Question 30 : The general formula for the alkanes is
1. C_NH_2N
2. C_NH_2N+1
3. C_NH_2N-2
4. C_NH_2N+2
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