Published by:
CGP EDU Academic Team
Published on: August 14, 2026
250mL of 0.5MNaOH was added to 500mL of 1MHCl. The number of unreacted HCl molecules in the solution after complete reaction is ___ 
(Nearest integer) 
Text Solution
Verified by ExpertsThe correct answer is:
226
(226)
We known that no. of moles 
Molarity
& No. of millimoles 
Molarity
so millimoles of 
Millimoles of 
Now reaction is 
t=0 125 500 0 0
t=t 0 375 125 125
so millimoles of HCl left = 375Moles of 
No. of HCl molecules 
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