Chemistry Practice Question and Answer
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Q: What is the role of a positive catalyst in a chemical reaction?
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5ed8d7d354f88e519fa2312f- 1It increases the rate of reactiontrue
- 2It decreases the rate of reactionfalse
- 3It increases the yield of the productsfalse
- 4It provides better purity of the productsfalse
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Answer : 1. "It increases the rate of reaction "
Q: Impure camphor is purified by
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5ed8d0e4e4997750bdbabbef- 1sublimationtrue
- 2fractional crystallizationfalse
- 3fractional distillationfalse
- 4steam distillationfalse
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Answer : 1. "sublimation"
Q: Water gas is the mixture of
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5ed8add854f88e519fa1b8c9- 1carbon dioxide and hydrogenfalse
- 2carbon monoxide and hydrogentrue
- 3carbon dioxide and nitrogenfalse
- 4carbon monoxide and nitrogen bearfalse
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Answer : 2. "carbon monoxide and hydrogen "
Q: Which is the purest form of iron?
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5ed8a86454f88e519fa1af9a- 1Steelfalse
- 2Cast ironfalse
- 3Pig ironfalse
- 4Wrought irontrue
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Answer : 4. "Wrought iron "
Q: German silver used for making utensils is an alloy of
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5ed88dbbb516791f26501eea- 1copper silver nickelfalse
- 2copper zinc nickeltrue
- 3copper zinc aluminumfalse
- 4copper nickel aluminumfalse
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Answer : 2. "copper zinc nickel "
Q: Milk is a natural
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5ed63d274bd6e60aba33c8a4- 1Solutionfalse
- 2Mixturefalse
- 3Suspensionfalse
- 4Emulsiontrue
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Answer : 4. "Emulsion "
Q: The gas used for artificial fruit ripening of green fruit is
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5ed634c2436d8a49583c72fa- 1Ethanefalse
- 2Ethylenefalse
- 3Methanefalse
- 4Acetylenetrue
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Answer : 4. "Acetylene "
Q: Percentage of lead in lead pencil is:
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5ed62769436d8a49583c61d8- 1zerotrue
- 220false
- 380false
- 47false
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Answer : 1. "zero "
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