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Q. The 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
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Q. A common fluorescent tube contains
Q. The pollutant responsible for ozone holes is _______
Q. The 'Green House effect' is produced due to the presence of excess amount of
Q. Which among the given is not soluble in water -
Q. The inert gases are ____ in water.
Q. Which among the given acids is synthesized in human stomach
Q. The most electropositive elements among the following is
Q. The main chemical constituent of clay is
Q. The best way of sterilising a hypodermic syringe for injecting medicine is by
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