Which of the following methods is NOT suitable for concentrating a protein solution?

A 1 molal aqueous solution contains 0.5 moles of solute. What is the mass of the solvent (water) in kilograms?

2 grams of sodium hydroxide was treated with $50 \mathrm{mL}$ of $0.75 \mathrm{M}$ HCl solution. The mass of sodium hydroxide left unreacted is equal to

The least count of burette used normally in laboratory is :

For the reaction, $2{\rm{F}}{{\rm{e}}^{3 + }} + {\rm{S}}{{\rm{n}}^{2 + }} o 2{\rm{F}}{{\rm{e}}^{2 + }} + {\rm{S}}{{\rm{n}}^{4 + }}$ The normality of ${\rm{SnC}}{{\rm{l}}_2}$ (mol.wt. = 189.7) solution prepared by dissolving 47.5 g in acid solution and diluting with ${{\rm{H}}_2}{\rm{O}}$ to a total of 2.25 litre is :

For the reaction : ${{\rm{N}}_2} + 3{{\rm{H}}_2} o 2{\rm{N}}{{\rm{H}}_3}$ ; if ${E_1}\,and\,{E_2}$ are equivalent masses of $N{H_3}$ and ${N_2}$ respectively, then ${E_1}\, - \,{E_2}$ is :

If we dissolve 20g of NaOH in 200ml of water, what will be the mass percentage of NaOH in the solution (assuming the density of water is 1g/ml)?

The process of removing gangue from ore is known as:

1 gram of potassium hydroxide was treated with $20 \mathrm{mL}$ of $0.5 \mathrm{M}$ HCl solution. The mass of potassium hydroxide left unreacted is equal to

What is the unit of molarity?

A 0.5 molal aqueous solution of urea ($CON_2H_4$) is prepared. What is the mole fraction of urea?