Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as
The process of hardening the surface of wrought iron by depositing a surface layer of steel on it is called case-hardening. It is done by heating wrought iron in contact with potassium ferrocyanide.
Alternatively, case hardening can also be done by heating wrought iron with charcoal and then plunging it in a suitable oil.
Arrange Ce3+, La3+, Pm3+ and Yb3+ in increasing order of their ionic radii
The basic character of the transition metal monoxide follows the order
(At. No. of Ti = 22, V = 23, Cr = 24, Fe = 26)
The metallic oxide which impart purple colour to pottery is
The colour of 62Sm3+ is yellow. The expected colour of 66Dy3+ is
The actinoids showing +7 oxidation state are
The lanthanoids contraction relates to
A reduction in atomic size with increase in atomic number is a characteristic of elements of
The most convenient method to protect bottom of ship made of iron is
F2 is formed by reacting K2MnF6 with
Which of the following are d-block elements but not regarded as transition elements?