Q. The most electropositive elements among the following is

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Q. The method that cannot be used for removing permanent hardness of water is

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Q. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

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Q. The gas used for artificial ripening of green fruit is

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Q. Zone refining is used for the purification of

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Q. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

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Q. The molecule which has the highest percentage of ionic character among the following is

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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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