Physical and Ch...

Which of the following is a physical change?

Which of the following is a chemical change?

A chemical change may involve

Which of the following is/are true when milk changes into curd?

1.  Its state is changed from liquid to semi-solid.
2. It changes colour.
3.  It changes taste.
4. The change cannot be reversed.

Choose the correct option from below.

A man painted his main gate made up of iron, to

1. prevent it from rusting.
2. protect it from sun.
3. make it look beautiful.
4. make it dust free.

Which of the above statement(s) is/are correct?

Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?

Galvanisation is a process used to prevent the rusting of which of the following?

Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a

Which of the following statements is incorrect for a chemical reaction?

Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling,beautiful blue coloured crystals got separated (step II). Step I and step II are