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 10^th Bohr's orbit are

The main use of salt in the diet is to

The ionic radii of N^3-, O^2-, 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