Q. The luster of a metal is due to

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Q. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

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Q. The most malleable metal is

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Q. The oil used in the froth floatation process is

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Q. The number of waves in n x 10th Bohr's orbit are

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Q. The mass of one Avogadro number of helium atom is

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Q. The items amenable to detection by soft x-rays are

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Q. The material which can be deformed permanently by heat and pressure is called a

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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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