What type of following compounds is obtained in first step of Wolf-Kishner reduction of carbonyl compounds?

The reaction $2 \mathrm{~A}+\mathrm{B}+\mathrm{C} \longrightarrow \mathrm{D}+\mathrm{E}$ is found to be first order in A , second order in B and zero order in C . What is the effect of increasing concentration of all reactants twice?

Calculate mass in kg of $4.48 \mathrm{dm}^3$ carbon dioxide at STP.

Calculate the molar mass of solute in a solution prepared by dissolving 1 gram in $0.3 \mathrm{~dm}^3$ solvent having osmotic pressure 0.2 atm at 300 K.

$$\left[\mathrm{R}=0.082 \mathrm{~dm}^3 \mathrm{~atm} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right]$$