Q. The molecular formula of phosphorous is

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Q. The inert gases are ____ in water

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

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Q. The metal that is usually extracted from sea water is

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Q. The formula C6H5-CO-CH3 represents

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Q. The maximum number of covalent formed by nitrogen is

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Q. The mass number of an atom is equal to

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

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Q. The National Chemical Laboratory is situated in

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Q. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in

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Q. The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

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Q. The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

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Q. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

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Q. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

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Q. The hottest part of the gas flame is known as

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Q. The number of electrons presents in H+ is

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Q. The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of

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Q. The hardest form of carbon is

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Q. The maximum number of isomers for an alkene with molecular formula C4H8 is

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Q. The main active constituent of tea and coffee is

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