$CH_3CN \xrightarrow{Na + C_2H_5OH} X$. The compound $X$ is:

In the coordination compound $K_4[Ni(CN)_4]$,the oxidation state of nickel is:

$A$ body falling from a height of $10\,m$ rebounds from a hard floor. If it loses $20\%$ of its energy on impact,then the coefficient of restitution is:

Three rods of the same dimensions have thermal conductivities $3 K, 2 K$,and $K$. They are arranged as shown in the figure below. The temperature of the junction in the steady state is:

If $\frac{2 x^3+x^2-5}{x^4-25}=\frac{A x+B}{x^2-5}+\frac{C x+1}{x^2+5}$,then $(A, B, C)$ equals to

How many chloride ions are there around a sodium ion in a sodium chloride crystal?