Is Matter Around Us Pure-Sample Questions

1.  Which process can purify the impure sample of potash alum?

2.  Name the solutions which show the Tyndall effects

3.  What is centrifugation? Explain briefly.

4.  Name some homogenous as well as heterogeneous mixtures.

5.  What are the differences between a physical change and a chemical change?

6.  What is the procedure to obtain different gases from air?

7.  How is fog different from smoke?

8.  Is water a compound? Prove your answer.

9.  Calculate the concentration of 45 g salt present in 500 g of solution.

10.  A girl is given naphthalene balls powder and common salt. Help her by explaining how to separate the mixture.