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The salt inside a common cold pack is:

AAluminium acetate
BAntimony sulphate
CArsenic chloride
DAmmonium nitrate
Answer & Solution
Correct answer: D. Ammonium nitrate
1. The salt must dissolve while absorbing heat. 2. One cheap salt does this well in water. 3. It is ammonium nitrate. _Source: OpenStax Chemistry 2e, Chapter 5, Thermochemistry._
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