Assertion: Green colour of ferrous sulphate crystals changes to white upon heating.

Reason: Ferrous sulphate loses water of crystallisation upon heating.

Choose the correct option out of the following.

Both assertion and reason are correct, and reason is the correct explanation of assertion.

The correct answer is option 1. Both assertion and reason are correct, and reason is the correct explanation of assertion.

The assertion that the green color of ferrous sulfate crystals changes to white upon heating is correct. When ferrous sulfate crystals, which contain water molecules as part of their crystal structure, are heated, they lose this water of crystallization. This loss of water leads to a change in the color of the crystals from green to white.

The reason provided, that ferrous sulfate loses water of crystallization upon heating, is also correct and directly explains why the color change occurs. Water of crystallization is the water molecules that are incorporated into the crystal lattice of a compound. When the ferrous sulfate crystals are heated, these water molecules are driven off, resulting in the loss of the green color associated with the hydrated form of the compound.

Therefore, both the assertion and the reason are correct, and the reason correctly explains why the assertion is true.