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Q. The most abundant rare gas in the atmosphere is
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Q. Which of the following type of coal has the lowest proportion of volatile matter ?
Q. Among the fuels given below, the one with highest calorific value is
Q. Cutting and peeling of onion brings tears to the eyes because of the presence of _____ ?
Q. The ore which is found in abundance in India is
Q. The substance that can conduct electricity in its molten state is
Q. Copper substances when exposed to air gains a green coating due to the formation of:
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