In a cash flow statement, which of the following is classified under investing activities?

For a reaction $2{\mathrm{H}}_2{\mathrm{O}}_2$

$2{\mathrm{H}}_2{\mathrm{O}}_2\underset{\mathrm{Alkaline} \mathrm{medium}}{\overset{{\mathrm{I}}^{-}}{\to }}2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$

The proposed mechanism is as given below:

1. ${\mathrm{H}}_2{\mathrm{O}}_2+{\mathrm{I}}^{-}\to {\mathrm{H}}_2\mathrm{O}+{\mathrm{IO}}^{-}$ (slow)

2. ${\mathrm{H}}_2{\mathrm{O}}_2+{\mathrm{IO}}^{-}\to {\mathrm{H}}_2\mathrm{O}+{\mathrm{I}}^{-}+{\mathrm{O}}_2$ (fast)

 Write the overall order of a reaction.

For a reaction $2{\mathrm{H}}_2{\mathrm{O}}_2$

$2{\mathrm{H}}_2{\mathrm{O}}_2\underset{\mathrm{Alkaline} \mathrm{medium}}{\overset{{\mathrm{I}}^{-}}{\to }}2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$

The proposed mechanism is as given below:

1. ${\mathrm{H}}_2{\mathrm{O}}_2+{\mathrm{I}}^{-}\to {\mathrm{H}}_2\mathrm{O}+{\mathrm{IO}}^{-}$ (slow)

2. ${\mathrm{H}}_2{\mathrm{O}}_2+{\mathrm{IO}}^{-}\to {\mathrm{H}}_2\mathrm{O}+{\mathrm{I}}^{-}+{\mathrm{O}}_2$ (fast)

Out of steps (1) and (2), which one is rate-determining step?

FInd the number of all possible matrices of order

$3\times 3$ with each entry $0$ or $1$.

A $10 \mathrm{V}$ cell of negligible internal resistance is connected in parallel across a battery of emf $200 \mathrm{V}$ and internal resistance $38 \mathrm{\Omega }$ as shown in the figure. Find the value of current in the circuit. 

Electrons are emitted by a hot filament and are accelerated by an electric field as shown in  the following figure. The two stops at the left ensure that the electron beam has a uniform cross-section.