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Q U I Z

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1 Brass gets discoloured in air because of the presence of which of the following gases in air?


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2 Which of the following is a non metal that remains liquid at room temperature?


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3 Chlorophyll is a naturally occurring chelate compound in which central metal is


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4 Which of the following is used in pencils?


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5 Which of the following metals forms an amalgam with other metals?


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6 The gas usually filled in the electric bulb is




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