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Q.

Observe the given figure carefully and select the correct statements.
I) Heat is evolved in this reaction.
II) The colour of the mixture in the conical flask is pink in the beginning.
III) It represents a neutralization reaction.
IV) No new substance is formed in the reaction.

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a

III and IV only

b

II and III only

c

I, II and III only

d

None of these

answer is A.

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Detailed Solution

During the titration of strong acid and strong base to identify the end point pH indicators are used. In presence of strong base (NaOH) Phenolphthalein gives pink colour in solution. In neutralization reactions heat is always evolved. Hence it is an exothermic process

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