If $f(x) = (x^2 - 1)^7$,then $f^{(14)}(x)$ is equal to

The $\pi$-acid ligand which uses its $d$-orbital during synergic bonding in its complex compound is

What is meant by floral formula ? Which signs are used to make floral formula ?

Which of the following is absent in polluted water?

Assertion $(A)$: Cyclohexane is the most stable cycloalkane.
Reason $(R)$: Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.
The correct answer is:

$N$ divisions on the main scale of a vernier calipers coincide with $(N + 1)$ divisions of the vernier scale. If each division of main scale is $a$ units, then the least count of the calipers is