A) 2M
B) 0.05 M
C) 0.02 M
D) 0.1 M
Correct Answer: D
Solution :
Key Idea: Concentration \[(M)=\frac{{{M}_{1}}\,{{V}_{1}}+\,{{M}_{2}}\,{{V}_{2}}}{total\text{ }volume}\] \[{{M}_{1}}=\] molarity of \[HCl\] solution = 0.1 M \[{{V}_{1}}=\] volume of \[HCl\] solution = 1 L \[{{m}_{2}}=\] molarity of \[NaOH\] solution = 0.1 M \[{{V}_{2}}=\] volume of \[NaOH\] solution = 1 L \[\therefore \] \[M=\frac{0.1\times 1+0.1\times 1}{1+1}\] \[=\frac{0.2}{2}=0.1\,M\]
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