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Q. Quartz crystals normally used in quartz clocks etc is chemically
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Q. Purification of copper is done by
Q. The element with highest 1st ionisation energy is
Q. Brass gets discoloured in air due to the presence of which gas in air?
Q. At high altitudes it is difficult to cook eggs or vegetables properly because of
Q. Cryogenic Science is related to –
Q. In the eye donation, which part of the eye is transplanted from the donor?
Q. The disease which has been eradicated:
Q. Which of the following one of the following is not coal variety
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