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Q. Modern periodic table is based on .......... ?
The modern periodic table is based on the periodic law: "The chemical properties of elements are a periodic function of their atomic number."
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Q. The compound dissolved in water to give a solution of pH lower than seven is
Q. The industrial preparation of the metal aluminium from boxite involves the process of
Q. Which of the following shows the masses of the three elementary particles in decreasing order?
Q. The purest form of water is
Q. Which group in the modern periodic table contains elements that are inert gases?
Q. A balloon filled with helium rises in air because
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