What is formed when $HCOOH$ reacts with concentrated $H_2SO_4$?

Seven white balls and three black balls are randomly arranged in a row. The probability that no two black balls are placed adjacently is

Which scientific term is used for a convenient category for the study of organisms like fish and mammals?

The rupture and fractionation do not usually occur in the water column in $vessels/tracheids$ during the ascent of sap because of

$A$ car weighs $1800\,kg$. The distance between its front and back axles is $1.8\,m$. Its centre of gravity is $1.05\,m$ behind the front axle. Force exerted by the level ground on each front wheel is ........ $N$.

If $2 x^2-3 x y+y^2+x+2 y-8=0$,then $\frac{d y}{d x}$ is equal to