Impure Substances

Q.

Air is not a pure substance.

1. True

2. False

Q.

Encircle the odd one from the list given below:-

Atmosphere, air, Carbon dioxide, snow

Q. Which one of the following is not a compound?

1. Water
2. Air
3. Common salt
4. Carbon dioxide

Q. Which among the following is a pure substance?

1. Sea water
2. Blood
3. Ice
4. Muddy water