Which of the following reactions will not result in the formation of carbon-carbon bonds?

The limiting friction between two bodies in contact is independent of

Which of the following pairs of transition metal ions have the same calculated values of magnetic moment?

Assertion : Between any two given energy levels,the number of absorption transitions is always less than the number of emission transitions.
Reason : Absorption transitions start from the lowest energy level only and may end at any higher energy level. But emission transitions may start from any higher energy level and end at any energy level below it.

The equivalent weight of $H_3PO_4$ in the following reaction is:
$H_3PO_4 + Ca(OH)_2 \to CaHPO_4 + 2H_2O$

If $b+c=3a$,then $\cot \frac{B}{2} \cot \frac{C}{2}$ is equal to :