Question

Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as

Solution

Correct option is

 

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.

SIMILAR QUESTIONS

Q1

Arrange Ce3+, La3+, Pm3+ and Yb3+ in increasing order of their ionic radii

Q2

 

The basic character of the transition metal monoxide follows the order

(At. No. of Ti = 22, V = 23, Cr = 24, Fe = 26)

Q3

The metallic oxide which impart purple colour to pottery is

Q4

The colour of 62Sm3+ is yellow. The expected colour of 66Dy3+ is

Q5

The actinoids showing +7 oxidation state are

Q6

The lanthanoids contraction relates to

Q7

A reduction in atomic size with increase in atomic number is a characteristic of elements of

Q8

The most convenient method to protect bottom of ship made of iron is

Q9

F2 is formed by reacting K2MnF6 with

Q10

Which of the following are d-block elements but not regarded as transition elements?