450cm3
300cm3
200cm3
150cm3
Correct answer is A
From the dilution law
C1V1 = C2V2
C1 = Initial Concentration of NaOH = 0.6M
V1 = Initial Volume of NaOH = 300cm3
C2 = Final Concentration of NaOH = 0.4M
V2 = Final Volume of NaOH = ?
V2 = C1V1C2
V2 = 0.6×3000.4
V2 = 450 cm3
Correct Computation as it follows the equation specified
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