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Q. Water, on passing over rocks, becomes hard because it disolves
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Q. The percentage of nitrogen present in ammonium sulphate is:
Q. What is the electron configuration of Radium?
Q. The best material for casting footprint marks in sand is
Q. The number of neutrons present in an element having mass number 226 & atomic number 88 is:
Q. The substance that is added to make natural rubber strong & more bouncy is
Q. Which one of the following elements is essential for construction is nuclear reactors
Q. The formula C6H5-CO-CH3 represents
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