Boron can be obtained by various methods but not by :

Consider the following reaction: $N_{2(g)} + 3H_{2(g)} \longrightarrow 2NH_{3(g)}$. The rate of this reaction in terms of $N_2$ at $T \ K$ is $-\frac{d[N_2]}{dt} = 0.02 \ mol \ L^{-1} \ s^{-1}$. What is the value of $-\frac{d[H_2]}{dt}$ (in units of $mol \ L^{-1} \ s^{-1}$) at the same temperature?

Milk is an example of

In which of the following are vessels and companion cells found?

The number of $5$-digit numbers that are not divisible by $5$ and consist of different odd digits is:

If $dx + dy = (x + y)(dx - dy)$,then $\log(x + y)$ is equal to