`x xx 10^(-2)` gm of NaOH should be used up to prepare 200ml of a solution with `P^(H)`= 12. Find the value of x

Options

A. All are correct
B. 1, 4 are only correct
C. 1,2,3 are only correct
D. All are wrong

Answer

A

Explanation

on dilution , pH increase for acid
(b) pH `= 5 rArr [H^(+) ] = 10 ^(-5) `
` pH = 11 rArr [H^(+) ] = 10 ^(-3) `
`therefore 100 `times more basic
( c ) `pH = 8 rArr [H^(+) ] = 10 ^(-8) `
` pH = 11 rArr [H^(+) ] =10 ^(-11) `
`therefore 100 `times more acidic
(d) KOH is basic ` 10 ^(-9) ` M KOH
`rArr pH gt 7` but slightly greater