The element used for making solar cells is

Which of the following is a physical change?

The gas used for filling weather  balloons is-

Bronze is an alloy of-

The most reactive among the halogens is-

_________is the process in which acids and bases react to form salts and water.

The acid used in lead storage cells is-

The pH of a neutral solution is —

Which metal is extracted from seawater?

Milk tastes sour when kept in the open for sometimes due to the formation of-