Q. The high reactivity of fluorine is due to

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Q. The iron ore magnetite consists of

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Q. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

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Q. The major constituent of air is

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Q. The main chemical constituent of clay is

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Q. The mineral containing both magnesium and calcium is

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Q. The metal does not give H2 on treatment with dilute HCL is

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Q. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

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Q. The most extensive, commercially useful source of thorium as monazite sand occurs in India at

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Q. The main active constituent of tea and coffee 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 hardest form of carbon 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 number of electrons presents in H+ is

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

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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 isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

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

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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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