Q) Ozone layer of atmosphere absorbs:
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(A)
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Chemistry MCQ Questions with answers
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Learn Chemistry MCQs [Page 12 ]
Q) Air shows the property of
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(C)
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Q) The most abundant constituent of atmospheric air is :
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(D)
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Q) The percentage of oxygen in air is approximately
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(D)
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Q) The major constituent of air is
Correct Answer - Option
(A)
Explanation:
Below a height of about 86 kilometers, the three main gaseous elements, which together account for about 99.9% of the total atmosphere, exist in essentially constant proportion to the total: nitrogen comprises 78% of air by volume, oxygen comprises 21% of air by volume, and argon comprises another 0.9%.
Q) Which one of the following is not a micro – nutrient ?
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(B)
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C
Q) Alloy steel containing chromium to resist rusting is known as
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(A)
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C
Q) The existence of different isotopes of an element is due to the presence of a different number of _____ in the nucleus of their atoms
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(A)
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R
Q) The substance that cannot be used as an insecticide is
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(A)
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R
Q) The radioactive element that occurs abundantly in India and can be used in place of uranium in nuclear power plants is
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(A)
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