Which of the following oxides is strongly basic?

One mole of an ideal gas having initial volume $V$,pressure $2P$ and temperature $T$ undergoes a cyclic process $ABCDA$ as shown in the figure. The net work done in the complete cycle is:

Let $n = 1! + 4! + 7! + \ldots + 400!$. Then the ten's digit of $n$ is

During the change of $O_2$ to $O_2^-$,the incoming electron goes to the orbital

For better survival of the human population,which of the following steps is most important?

For a reversible reaction $A \rightleftharpoons B$,which one of the following statements is wrong from the given energy profile diagram?