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Exercise

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The molecular formula of phosphorous is

A. P1 B. P2
C. P3 D. P4

The inert gases are ____ in water

A. sparingly soluble B. insoluble
C. soluble D. None of these

The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

A. liquation B. leaching
C. levigation D. magnetic separation

The formula C6H5-CO-CH3 represents

A. Acetone B. Acetic acid
C. Acetophenone D. Phenyl acetate

The maximum number of covalent formed by nitrogen is

A. 1 B. 2
C. 3 D. 4

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