2.5 litre of 1 M NaOH solution is mixed with another 3 litre of 0.5 M NaOH solution. Then find out molarity of resultant solution.

The percentage of C, H and N in an organic compound are 40%, 13.3% and 46.7% respectively then empirical formula is

Specific volume of cylinfrical virus particle is 6.02 $$ \times $$ 10^$$-$$2 cc/g whose radius and length are 7 $$\mathop A\limits^ \circ $$ and 10 $$\mathop A\limits^ \circ $$ respectively. If _NA = 6.02 $$ \times $$ 10²³, find molecular weight of virus.

Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4) then minimum molecular weight of peroxide anhydrous enzyme is