How do ortho and para hydrogen differ from each other?

In $Bryophytes$,sexual reproduction occurs through which organs?

Which of the following is an electrophile?

The Biodiversity Act of India was passed by the Parliament in the year:

If $A$ and $B$ are any two sets,then $A \cup (A \cap B)$ is equal to

Consider the following reaction: $A \longrightarrow \text{Products}$. This reaction is completed in $100 \ min$. The rate constant of this reaction at $t_1 = 10 \ min$ is $10^{-2} \ min^{-1}$. What is the rate constant (in $min^{-1}$) at $t_2 = 20 \ min$?