Life and Its Forms

Q.

Origin of water takes place on earth due to:

1. Reaction between oxygen and hydrogen

2. Meteor rain

3. Explosion on earth

4. Volcanic eruption

Q. Which of the following fuels contain carbon in them?

1. Coal
2. Petroleum
3. Biogas
4. Natural gas

Q. In an aqueous solution of barium nitrate, the $\left[N{O}_3^{-}\right]$ is 0.080 M. This solution can be labeled as

1. $0.080NBa(N{O}_3{)}_2$
2. $0.160MBa(N{O}_3{)}_2$
3. $0.040NBa(N{O}_3{)}_2$
4. $0.080MN{O}_3^{-}$

Q. In an aqueous solution of barium nitrate, the $\left[N{O}_3^{-}\right]$ is 0.080 M. This solution can be labeled as

1. $0.080NBa(N{O}_3{)}_2$
2. $0.080MN{O}_3^{-}$
3. $0.040NBa(N{O}_3{)}_2$
4. $0.160MBa(N{O}_3{)}_2$