The lines $x-y-2=0$,$x+y-4=0$ and $x+3y=6$ meet at a common point:

Which pair of oxyacids of phosphorus contains $P-H$ bonds?

Which of the following compounds undergoes sulfonation most easily?

If the angle between the pair of lines $2x^2 + 2hxy + 2y^2 - x + y - 1 = 0$ is $\tan^{-1}(3/4)$ and $h$ is a positive rational number,then the point of intersection of these two lines is

The angle between the lines whose direction cosines satisfy the equations $l+m+n=0$ and $l^2+m^2-n^2=0$ is

The voltage of an $ac$ source varies with time according to the equation $V = 100 \sin(100 \pi t) \cos(100 \pi t)$,where $t$ is in seconds and $V$ is in volts. Then: