Maximum contribution of $O_2$ is from

For the redox reaction $xP_4 + yHNO_3 \to H_3PO_4 + NO_2 + H_2O$,find the values of $x$ and $y$.

Which of the following effects is observed after the consumption of $\Delta-9-THC$?

The condition that $f(x)=a x^3+b x^2+c x+d$ has no extreme value,is

Which of the following is a biodegradable polymer?

Two point charges $-10 \mu C$ and $+5 \mu C$ are situated on the $X$-axis at $x=0$ and $x=\sqrt{2} \ m$. The point along the $X$-axis where the electric field becomes zero is: