15 : As compared to lithium sodium reacts quickly with water because? Why?

Q.

As compared to lithium, sodium reacts quickly with water because

Q. Sodium and potassium react with water much more vigorously than lithium because:

Q. Sodium reacts with water vigorously than lithium because:

Q.
If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because

Q. Climax stage is achieved quickly in secondary succession as compared to primary succession. Why?