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Question

What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place

A
(i) only
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B
(i) and (iii)
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C
(ii) and (iii)
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D
(i) and (iv)
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Solution

The correct option is D (i) and (iv)
Acid and base are mixed to give salt and water. This process is exothermic in nature giving out heat called as heat of neutralization which causes an increase in temperature. So, these reactions can be explosive in nature when acid is added to any base and this raises the temperature of acid-base reactions.
HCl+NaOHNaCl+H2O+heat

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