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Q. With reference to metals and their ores, which of the following pairs is INCORRECT?
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Q. What is the element present in urea
Q. The substance that can conduct electricity in its molten state is
Q. Salts of which among the given elements provide colours to fireworks?
Q. Which among the given is the main nitrogenous waste in humans
Q. Among the fuels given below, the one with highest calorific value is
Q. Which of the following has the longest wave length?
Q. Which combination of atoms can form a polar covalent bond?
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