The inert gases are ____ in water
The gas used in the manufacture of vanaspati from vegetable oil is
The nucleus of a hydrogen atom consists of
The method that cannot be used for removing permanent hardness of water is
The number of waves in n x 10th Bohr's orbit are
The main use of salt in the diet is to
The ionic radii of N3-, O2-, F- and Na+ follows the order
The heat required to raise the temperature of body by 1 K is called
The metal does not give H2 on treatment with dilute HCL is
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
The mass of one Avogadro number of helium atom is
The monomer of polythene is
The graphite rods in the nuclear reactor
The nuclear particles which are assumed to hold the nucleons together are
The number of g-molecule of oxygen in 6.x 1024CO molecules is
The gas used for artificial ripening of green fruit is
The items amenable to detection by soft x-rays are
The luster of a metal is due to
The first metal used by man was
The mass of P4O10 that will be obtained from the reaction of 1.gram of P4 and 5.of oxygen is
The most extensive, commercially useful source of thorium as monazite sand occurs in India at
Zone refining is used for the purification of
The material which can be deformed permanently by heat and pressure is called a
The number of water molecules present in a drop of water (volume 0.ml) at room temperature is
The hydronium ion is
The octane number of zero is assigned to
The main active constituent of tea and coffee is
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
The mass number of a nucleus is
The most malleable metal is
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