Question

A very powerful magnetic substance is prepared by mixing magnetite with:

• A. calcium oxide
• B. copper oxide
• C. barium oxide
• D. none of these

Answer 1

The correct option is C

barium oxide

Explanation of correct option:

1. (c) barium oxide: A mixture of barium oxide and ferrous oxide are highly magnetic and are used to make a permanent magnet.

Explanation of incorrect option:

1. (a) Calcium oxide: This is used in medicinal and other artistry works.
2. (b) Copper oxide: This is used in the manufacturing of paints, glass and porcelain.
3. (d) None of these.

So, the correct option is (c).