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

If the distance $s$ travelled by a particle in time $t$ is given by $s=t^2-2t+5$, then its acceleration is

$A$ candidate takes three tests in succession and the probability of passing the first test is $p$. The probability of passing each succeeding test is $p$ if he passes the preceding one,or $\frac{p}{2}$ if he fails the preceding one. The candidate is selected if he passes at least two tests. The probability that the candidate is selected is:

The normal at the point $(1,1)$ on the curve $2y + x^{2} = 3$ is

Zener breakdown takes place if

The angle between the asymptotes of the hyperbola $x^2-3y^2=3$ is