What is the concentration of $20$ volume $H_2O_2$ in $g/L$?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$ :
Assertion $A$: Size of $Bk^{3+}$ ion is less than $Np^{3+}$ ion.
Reason $R$: The above is a consequence of the actinoid contraction.
In the light of the above statements,choose the correct answer from the options given below:

If the direction ratios $(l, m, n)$ of two lines satisfy the equations $l+m+n=0$ and $mn-2ln+lm=0$,then the angle between the lines is

Hypo is used in photography because of its

$n$ conducting wires of same dimensions but having resistivities $1, 2, 3, . . . , n$ are connected in series. The equivalent resistivity of the combination is

Identify the plant shown in the given figure.