The hardest form of carbon is
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The most important ore of aluminium is
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The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of
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The number of electrons presents in H+ is
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The hottest part of the gas flame is known as
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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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The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
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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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The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
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The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
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The National Chemical Laboratory is situated in
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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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The mass number of an atom is equal to
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The maximum number of covalent formed by nitrogen is
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The formula C6H5-CO-CH3 represents
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The metal that is usually extracted from sea water is
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The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
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The inert gases are ____ in water.
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The molecular formula of phosphorous is
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The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of
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