What is formed when sodium bicarbonate is heated strongly?

Two blocks of $7 \ kg$ and $5 \ kg$ are connected by a heavy rope of mass $4 \ kg$. An upward force of $200 \ N$ is applied as shown in the diagram. The tension at the top end of the heavy rope at point $P$ is: $(g = 10 \ m/s^2)$ (in $N$)

The $pH$ value of which one of the following is not equal to $1$?

Kepler's second law (law of areas) is nothing but a statement of

Which of the following enzymes requires copper for its activity?

$A$ parallel plate air capacitor is charged to a potential difference of $V$. After disconnecting the battery,the distance between the plates of the capacitor is increased using an insulating handle. As a result,the potential difference between the plates: