When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet. ………………..

When dilute sulphuric acid reacts with iron sulphide, the gas evolved is

Statement - 1 : Wolframite impurities are separated from cassiterite by electromagnetic separation. And Statement - 2 : Cassiterite being magnetic is attracted by the magnet and forms a separate heap.

Which compound is formed when sodium is heated in oxygen ?

Iron filings and sulphur were mixed together and divided into two parts, 'A' and 'B'. Part 'A' was heated strongly while part 'B' was not heated. Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. How will you identify the gases evolved?

When steam is passed over red hot iron, the substance formed are:

When steam is passed over red hot iron, the substance formed are:

The combination of two bar magnets makes 10 oscillations per second in an oscillation magnetometer when like poles are tied together and 2 oscillations per second when unlike poles are tied together. Find the ratio of the magnetic moments of the magnets. Neglect any induced magnetism.

An iron needles is attracted to the ends of a bar magnet but not to the middle region of the magnet. Is the material making up the ends of a bar magnet different from that of the middle region?

When iron is heated in oxygen, it forms ferroso ferric oxide (Fe_3O_4) .