Brass gets discoloured in air because of the presence of which of the following

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



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

2) The variety of coal in which the deposit contains recognisable traces of the original plant material is

3) Potassium Permanganate is used for purifying drinking water, because

4) Which of the following rays are more penetrating?

5) The most important ore of aluminium is

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