$A$ compound absorbs light in the wavelength region $490-500 \ nm$. Its complementary colour is

Let $f(x)$ be defined for all $x > 0$ and be continuous. Let $f(x)$ satisfy $f(\frac{x}{y}) = f(x) - f(y)$ for all $x, y > 0$ and $f(e) = 1$. Then:

In the adjoining circuit diagram,the readings of the ammeter and voltmeter are $2 \ A$ and $120 \ V$,respectively. If the value of $R$ is $75 \ \Omega$,then the voltmeter resistance will be $\Omega$.

During electro-osmosis of $Fe(OH)_3$ sol,

How much amount of air can be inspired or expired during normal breathing (in $, l$)?

Lichens indicate $SO_2$ pollution because they