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Which of the following is not metal_____?
Which acid is present in lemon?
Which one is the pure element______?
A radioactive substance emits______?
Bleaching powder is used in drinking water as a / an
The substance which decreases the rate of a chemical reaction is called _____
Which one of the following has the highest fuels causes minimum environmental pollution____.
The name catalysis was given by____?
Which one among the following polymers is used for making bullet-proof material?
Which one is metal_____?
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