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Q. Which of the following is a chemical change?
Q. Which of the following acts both as oxidising and reducing agent?
Q. The process which does not evolve CO2 in air is
Q. Cooking gas supplied in cylinders by gas agencies is
Q. Which of the following elements does not spread pollution?
Q. Marsh gas, formed from decaying organic matter and in coal mines is
Q. The process of leaching involves
Q. Rutherford’s scattering experiment proved the presence of
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