In which of the following cases, the final solution obtained will definitely be basic?

Options

A. 100 ml 0.1 M NaOH solution is mixed with 200 m 0.1 M `H_(2)SO_(4)` solution
B. 50 ml 40% w/v NaOH solution is mixed with 1 litre of 0.5M `H_(2)SO_(4)` solution.
C. 200 gm of 40% w/w NaOH solution is mixed wih 1.5 litre of 1 MHCl soluton.
D. 200 ml of 0.2 M NaOH solution is mixed with 100 ml of 0.2 M `H_(2)SO_(4)` solution.

Answer

3

Explanation

(1) mm of `NaOH=100xx 0.1 =10`
mm of `H_(2)SO_(4)=200xx0.1 =20`
`2NaOH+H_(2)SO_(4) to Na_(2)SO_(4)+2H_(2)O`
10(LR)`" "` 20
Solution will be acidic
`{:((2),2NaOH,+,H_(2)SO_(4) to Na_(2)SO_(4)+2H_(2)),(t=0,"0.5 mole (LR)",,"0.5 mole"):}`
Solution will be acidic
(3) `{:(NaOH,+,HCl to Na_(2)SO_(4)+2H_(2)O),("2 mole","1.5 mole(LR)"):}`
So solution will be basic answer is (3)