TRB Chemistry questions
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Quiz Questions And Answers
A pungent smell often present near the urinals is due to
A mixture of salt and sand can be separated by
Graphite and diamond are the two forms of that occur in nature.
In the second period, which of the following is a semi metal?
Which of the following is used in vulcanization of rubber?
Colloidal form of soap lathering is also called
Which one of the toxic gases in the environment lowers the resistance to pneumonia in human beings?
Who discovered electrons?
Alum purifies muddy water by
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