Solutions Test ...

The solution having the highest vapour pressure is:

In an oxidation-reduction reaction, $$MnO_4^-$$ ion is converted to $${ Mn }^{ +2 }$$ is the number equivalents of $${ KMnO }_{ 4 }$$ (mol. wt = 158) present in 250 ml of 0.04 M $${ KMnO }_{ 4 }$$ solution?

A certain compound contains only Carbon and Oxygen. Analysis show that there is $$36$$% carbon and the rest is oxygen in the compound. If its molecular mass is 400, then what is the molecular formula of the compound? [atomic weight of (C)=12 and oxygen(O)=16.]

The vapour pressure of 3 aqueous solutions $$S_{1}, S_{2}$$ and $$ S_{3}$$ of the same solute at different concentrations are plotted against temperature in Kelvin. The order of their concentrations is:

The volume of water added to $$500 \mathrm { ml } , 0.5 \mathrm { M }$$ $$\mathrm { NaOH }$$ so that its strength becomes 10$$\mathrm { mg } \mathrm \ { NaOH }$$ per $$\mathrm { ml } .$$

20 mL of HC1 solution requires 29.85 ml.of 0.01M NaOH solution for complete neutralization.

Find the number of gram molecules of hydrogen present in 1 gram molecule of methane gas .

The vapour pressure of benzene at a certain temperature is 640 mm of Hg. A nonvolatile electrolyte solute weighing 2.175 g is added to 30.08 g of benzene. If the vapour pressure of the solution is 600 mm of Hg, what is the molecular weight of the solid substance?

$$1.0   \mathrm{g}  $$ of magnesium is burnt with $$0.56   \mathrm{g}  $$ of oxygen in a closed vessel. Which reactant is left in excess and how much? 
(At. weight of $$  \mathrm{Mg}=24, \mathrm{O}=16 )  $$

Oleum is composed of $$  \mathrm{H}_{2} \mathrm{SO}_{4}  $$ and which constituent?