Q. The mass number of a nucleus is

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Q. The inexpensive and commonly used variety of glass is called soda glass. It is called so because

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Q. The gas used in the manufacture of vanaspati from vegetable oil is

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Q. The ionic radii of N3-, O2-, F- and Na+ follows the order

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Q. The graphite rods in the nuclear reactor

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Q. The first metal used by man was

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Q. The hydronium ion is

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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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