Which of the following molecules does not have a linear arrangement of atoms?

The circumference of a circle is measured as $56 \text{ cm}$ with an error of $0.02 \text{ cm}$. The percentage error in its area is

The incentre of the triangle with vertices $(1, \sqrt{3})$,$(0, 0)$ and $(2, 0)$ is

$A$ circular disc of radius $R$ is removed from a bigger uniform circular disc of radius $2R$ such that the circumferences of the discs coincide. The centre of mass of the new disc is $\alpha R$ from the centre of the bigger disc. The value of $\alpha$ is

From which plant is the wood for cricket bats obtained?

In a pseudo first order hydrolysis of ester in water,the following results were obtained.

$t/s$	$0$	$30$	$60$	$90$
$Ester/mol\, L^{-1}$	$0.55$	$0.31$	$0.17$	$0.085$

What will be the average rate of reaction between the time interval $30$ to $60$ seconds?