The metal used to make temporary magnets

The method used to remove temporary hardness of water is:

Hysteresis loops for two magnetic materials A and B are given below : These materials are used to make magnets for electric generators , transformer core and electromagnet core. Then it is proper to use :

What do you mean by temporary magnets?

The method used to make a magnet in which a magnetic material is placed on a flat surface and stroked along its length

A metalloid used to make glass :

For substance hysteresis (B-H) curve are as shown in figure. For making temporary magnet which of the following is the best?

Electromagnets are called temporary magnets.

The metal used for making X-ray tube window is :

Name the element A trivalent metal used to make light tools.

Give reasons for the following: Washing soda can be used to remove both temporary and permanent hardness in water.