Class 12 Chemistry · Chapter 6 · Test 2
Reactions of Alcohols
50 MCQs
50 questions · 45 min · 50 marks
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Sample questions
The first 5 of 50. Try each one, then tap to see the answer.
Question 1
Complete combustion of an alcohol gives:
- ACO and H2
- BCarbon dioxide and water
- CCarbon and water
- DAldehyde and water
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Answer: B
Alcohols burn completely to CO2 and H2O.
Question 2
Which is the balanced equation for complete combustion of ethanol?
- AC2H5OH + 3O2 → 2CO2 + 3H2O
- BC2H5OH + 2O2 → 2CO2 + 3H2O
- CC2H5OH + 3O2 → CO2 + 3H2O
- D2C2H5OH + 3O2 → 4CO2 + 3H2O
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Answer: A
Atoms balance: 2 C and 6 H and 7 O on each side.
Question 3
Alcohols can be used as fuels because their combustion is:
- AEndothermic
- BSlow and cold
- CNon-spontaneous
- DHighly exothermic
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Answer: D
Ethanol releases 1367 kJ per mole.
Question 4
The enthalpy of combustion of ethanol is -1367 kJ/mol. How much heat is released by burning 4.6 g (Mr = 46)?
- A13.67 kJ
- B1367 kJ
- C136.7 kJ
- D683.5 kJ
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Answer: C
4.6 g is 0.10 mol so heat = 0.10 x 1367 = 136.7 kJ.
Question 5
What mass of CO2 forms when 0.50 mol of ethanol burns completely (CO2 = 44 g/mol)?
- A44 g
- B22 g
- C88 g
- D176 g
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Answer: A
Each mole of ethanol gives 2 mol CO2 so 0.50 mol gives 1.0 mol = 44 g.
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