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System, Surroundings, Intensive, Extensive Properties

When 100 ml o...

Question

When 100 ml of 1 N HCl is mixed with 100 ml of 1 N NaOH the heat evolved was found to be Q. The heat of neutralisation of HCl with NaOH is:

A

Q

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B

5 Q

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C

-10 Q

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D

10 Q

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Solution

The correct option is B -10 Q
No. of moles $=$ 0.1
for 0.1 mole Q amount of heat was evolved
for 1 mole 10Q amount of heat will be evolved
$Δ H = - 10 Q$

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