The first metal used by man was
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The hydronium ion is
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The most electropositive elements among the following is
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The method that cannot be used for removing permanent hardness of water is
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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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The gas used for artificial ripening of green fruit is
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Zone refining is used for the purification of
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The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
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The molecule which has the highest percentage of ionic character among the following is
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The high reactivity of fluorine is due to
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The iron ore magnetite consists of
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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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The major constituent of air is
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The main chemical constituent of clay is
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The mineral containing both magnesium and calcium is
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The metal does not give H2 on treatment with dilute HCL is
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The number of g-molecule of oxygen in 6.02 x 1024 CO molecules is
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The most extensive, commercially useful source of thorium as monazite sand occurs in India at
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The main active constituent of tea and coffee is
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The maximum number of isomers for an alkene with molecular formula C4H8 is
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