The molecular formula of phosphorous is

A. P1

B. P2

C. P3

D. P4

The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of

A. atomic structure

B. metallurgy

C. periodic table of contents

D. discovery of elements

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 metal that is usually extracted from sea water is

A. Ca

B. Na

C. K

D. Mg

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

The mass number of an atom is equal to

A. the number of protons

B. the number of protons and electrons

C. the number of nucleons

D. the number of neutrons

Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be

A. 2 : 16 : 2

B. 2 : 16 : 1

C. 1 : 16 : 2

D. 1 : 1 : 1

The National Chemical Laboratory is situated in

A. New Delhi

B. Bangalore

C. Pune

D. Patna

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