Which of the following statements is not correct?

$KO_2$ exhibits paramagnetic behaviour. This is due to the paramagnetic nature of

The area (in square units) of the region bounded by the curves $x=y^2$ and $x=3-2y^2$ is

Bottles containing $C_6H_5I$ and $C_6H_5CH_2I$ lost their original labels. They were labelled $A$ and $B$ for testing. $A$ and $B$ were separately taken in a test tube and boiled with $NaOH$ solution. The end solution in each tube was made acidic with dilute $HNO_3$ and then some $AgNO_3$ solution was added. Substance $B$ gave a yellow precipitate. Which one of the following statements is true for this experiment?

$A$ gas mixture consists of molecules of type $1, 2$ and $3$,with molar masses $m_1 > m_2 > m_3$. Let $(V_{rms})$ and $\overline{K}$ be the $r.m.s.$ speed and average kinetic energy of the gases,respectively. Which of the following is true?

$\int \frac{\sin x+8 \cos x}{4 \sin x+6 \cos x} d x$ is equal to