Chemistry - Questions (Section-1)
7The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is
A. heliumB. ozone
C. oxygen D. methane
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8The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is
A. Dalton's lawB. Gay Lussac's law
C. Henry's law D. Raoult's law
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9The main buffer system of the human blood is
A. H2CO3 - HCO3B. H2CO3 - CO32-
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10The molecules of which gas have highest speed?
A. H2 at -73oCB. CH4 at 300 K
C. N2 at 1,027oC D. O2 at 0oC
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11The most commonly used bleaching agent is
A. alcoholB. carbon dioxide
C. chlorine D. sodium chlorine
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12The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called
A. graniteB. basalt
C. igneous rocks D. sedimentary rocks
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