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Q. The acid present in lemons and oranges is
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Q. Which of the given coal contains 90 per cent of carbon
Q. Which of the following acid is used in Lead storage battery
Q. The first metal used by a man was
Q. The noble gas used in radiotherapy is
Q. The main element used in the vulcanisation of rubber is
Q. In upper layer of atmosphere ozone is formed by
Q. The sugar unit present in DNA is
Q. When water itself combines chemically with some element or mineral it is called
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