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

View solution

Q. The graphite rods in the nuclear reactor

View solution

Q. The first metal used by man was

View solution

Q. The hydronium ion is

View solution

Q. The most electropositive elements among the following is

View solution

Q. The method that cannot be used for removing permanent hardness of water is

View solution

Q. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

View solution

Q. The gas used for artificial ripening of green fruit is

View solution

Q. Zone refining is used for the purification of

View solution

Q. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

View solution

Q. The molecule which has the highest percentage of ionic character among the following is

View solution

Q. The high reactivity of fluorine is due to

View solution

Q. The iron ore magnetite consists of

View solution

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

View solution

Q. The major constituent of air is

View solution

Q. The main chemical constituent of clay is

View solution

Q. The mineral containing both magnesium and calcium is

View solution

Q. The metal does not give H2 on treatment with dilute HCL is

View solution

Q. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

View solution

Q. The most extensive, commercially useful source of thorium as monazite sand occurs in India at

View solution