What is the significant of N/10 NaOH solution ?

What is the significance of (E)/(N) ?

What is the molarity of 10% (w/v) NaOH solution?

25 mL of N/10 NaOH solution exactly neutralise 20 mL of an acid solution. What is the normality of the acid solution ?

The molarity of a 10% NaOH solution is

Find the mole fraction of 10% NaOH solution.