What is the role of limestone during the extraction of iron from haematite ore?

Which of the following statements is consistent with the Kingdom Fungi?

Which among the following is a haloarene?

$A$ particle falls from a height $h$ upon a fixed horizontal plane and rebounds. If $e$ is the coefficient of restitution,the total distance travelled before rebounding has stopped is

The integrating factor of the differential equation $(x \log x) \frac{dy}{dx} + y = 2 \log x$ is

In the reaction $\underset{\text{(Vapour)}}{C_2H_5OH} \xrightarrow[300^{\circ} C]{Cu} X$. The molecular formula of $X$ is