If the concentration of glucose $(C_{6}H_{12}O_{6})$ in blood is $0.72 \ g \ L^{-1}$,the molarity of glucose in blood is $..... \times 10^{-3} \ M$. (Nearest integer)
(Given: Atomic mass of $C=12, H=1, O=16 \ u$)

If $5.0 \ g$ of $BaCl_2$ is present in $10^6 \ g$ solution,the concentration is .......... $ppm$.

The molarity of the solution prepared by dissolving $6.3 \ g$ of oxalic acid $(H_{2}C_{2}O_{4} \cdot 2H_{2}O)$ in $250 \ mL$ of water in $mol \ L^{-1}$ is $x \times 10^{-2}$. The value of $x$ is ..... . (Nearest integer)
[Atomic mass : $H: 1.0, C: 12.0, O: 16.0]$

$A$ solution of $H_2O_2$ used for hair bleaching contains approximately $5.0 \ g$ of $H_2O_2$ per $100 \ mL$ of solution. If the molar mass of $H_2O_2$ is $34 \ g/mol$,what is the molarity of this solution?

Explain the concept of reactions in solutions and mass percentage.

$3.0\, g$ of oxalic acid $[(CO_2H)_2 \cdot 2H_2O]$ is dissolved in a solvent to prepare a $250\, mL$ solution. The density of the solution is $1.9\, g/mL$. The molality and normality of the solution,respectively,are closest to