When milk is converted into curd, the sour taste is due to :

When the soil is too basic, plants do not grow in it. To improve the quality, what must be added to the soil?

Lemon is citrus due to –

Milk of Magnesia is used when people suffer from indigestion of food. It is a

Which one of the following is coated on the photographic plate?

To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is