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Question

In which of the following cases of mixing of a strong acid and a strong base each of 1 N concentration would the temperature increase of the solution be the same (assume heat evolved in neutralisation is only used up to increase the temperature of the solution)?

A
20 mL acid and 30 mL alkali
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B
10 mL acid and 10 mL alkali
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C
35 mL add and 15 mL alkali
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D
50 mL acid and 50 mL alkali
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Solution

The correct option is D 50 mL acid and 50 mL alkali
Points to remember:
q=C×m×ΔT
Let the density of solution be d and x amount of heat is released when 1 ml of each react, then:
ΔT=C×mq
ΔT=C×d×vq (1)
Option A
ΔT=C×d×5020x
Option B
ΔT=C×d×2010x
Option C
ΔT=C×d×5015x
Option D
ΔT=C×d×10050x
So option D and B show the same value of ΔT

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