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Which of the following is an element?

A. Ruby B. Sapphire
C. Emerald D. Diamond

Potassium Permanganate is used for purifying drinking water, because

A. it is a sterilising agent
B. it dissolves the impurities of water
C it is a reducing agent
D. it is an oxidising agent

Which of the following metals remain in liquid for under normal conditions?

A. Radium
B. Zinc
C Uranium
D. Mercury

Which of the following is the lightest metal?

A. Mercury B. Lithium
C. Lead D. Silver

Amalgams are

A. highly coloured alloys
B. alloys which contain mercury as one of the contents
C alloys which have great resistance to abrasion
D. alloys which contain carbon

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