An artificial radioactive isotope gave N after two successive β-particle emissions. The number of neutrons in the parent nucleus must be
9
14
5
7
The number of α and β- particles emitted during the transformation of 90Th232 to 82Pb208 respectively are
4, 2
2, 2
8, 6
6, 4
The rate at which a substance reacts depends on its
atomic weight
atomic number
molecular weight
active mass
D.
active mass
According to law of mass action, at a given temperature, the rate of reaction at a particular instant is proportional to the product of active masses of the reactants at that instant raised to powers which are numerically equal to the numbers of their respective molecules.
Formation of coloured solution is possible when metal ion in the compound contains
paired electrons
lone pair of electrons
unpaired electrons
none of the above
A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (h = 6.63 × 10-34 Js)
6.63 × 10-35 m
6.63 × 10-34 m
6.63 × 10-31 m
6.63 × 10-37 m