Give reason for the following : Buttermilk is not stored in aluminium vessels.

Give reason for the following : CuSO_4 solution is not stored in iron vessels.

Give reasons for the following statements. Tamarind is not stored in aluminium vessels. It is a common practice to apply oil on iron articles and tools. Stainless steel knives, instead of iron knives, are preferred for cutting citrous fruits.

Give reasons for the following: Blue vitriol solution is not kept in iron vessels.

Give reasons for the following. Red light is used as signal lamps.

Give reason for the following. Sky in the moon appears dark.

Give reason for the following:- HF is liquid but HCI is gas.

Give reasons for the following: Graphite is used as a lubricant in machines.

Give reason for the following: Halogen act as good oxidising agent.

Give reason for the following: Maximum visual clarity is there in yellow spot.

Give one word for the following. Tissue specialised to store fats.