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Q. Name the Scientist who stated that matter can be converted into energy
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Q. The number of unpaired electrons in Mn2+ is
Q. Which of the following pigments causes the red colour in onions?
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Q. Acetyl salicyclic acid is commonly used as
Q. When conc. H2 SO4 is added to dry KNO3, brown fumes are evolved. These fumes are due to
Q. What is the pH value of a salt made up of a strong acid and a weak base?
Q. The main chemical constituent of clay is
Q. The substance that contains the maximum amount of nitrogen is
Q. The nitrogen atom has 7 protons and 7 electrons,The nitride ion will have
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