If 2g of NaOH is present in 200ml of its solution, its molarity will be
(a)0.25
(b)0.5
(c)5
(d)10

Correct option is A

Molecular weight of NaOH = 40

Now, We have to find the Molarity

Molarity = Moles/Volume in litre

So first we have to find the moles,

Moles = Weight in gram/Molecular weight
Moles = 2/40
Moles = 0.05 mol

Now, Put Moles in formula of Molarity and we have to take Volume in litres so volume will be 0.2litre

Molarity = Moles/Volume in litre
=0.05/0.2
= 0.25 Molar

Answer:- Molarity = 0.25 molar