When a green iron salt is heated strongly, its colour finally changes to black and odour of burning sulphur is given out
Name the iron salt.

When a green iron salt is heated strongly, its colour finally changes to black and odour of burning sulphur is given out Name the type of reaction that takes place during the heating of iron salt.

When black copper oxide placed in a beaker is treated with dilute HCl, its colour changes to

When iron is heated with sulphur, iron sulphide is formed. What is the reaction called?

Why does the colour of copper sulphate solution change,when an iron nail is dipped in it?

When heated above 916^(@)C , iron changes its bcc crystalline from to fcc without the change in the radius of atom . The ratio of density of the crystal before heating and after heating is :

The blue colour of crystals of a substance changed on heating in a closed test tube but the colour was regained after some time on cooling. Name the substance and write its chemical formula. Explain the phenomenon involved.

Direction. In the following questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A)If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if assertion is true, but reason if false, (D) if both assertion and reason are false Assertion : Soft iron is preferred for making electromagnets. Reason : Owing to low value of retentivitiy, the residual magnetism left in the soft iron is very small, when the current is switched off.