Chemistry Quiz - 3, General Knowledge - Current Affairs MCQ

The major constituent of air is

The main chemical constituent of clay is

The mineral containing both magnesium and calcium is

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

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

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

The main active constituent of tea and coffee is

The maximum number of isomers for an alkene with molecular formula C₄H₈ is

The hardest form of carbon is

The number of electrons presents in H⁺ is

The most important ore of aluminium is

The hottest part of the gas flame is known as

The organic reaction represented by equation CH₃ - CH = O + H₂NOH gives CH₃ - CH - NH + H₂O is an example of

The isomerism which exists between CH₃CHCI₂ and CH₂CI. CH₂CI is

The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in

The National Chemical Laboratory is situated in

Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be

The mass number of an atom is equal to

The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

The method of concentrating the ore which makes use of the difference in density between ore and impurities is called