Correct Answer: Option B

Explanation

- Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

-  A system of reactants that absorbs heat from the surroundings in an endothermic reaction has a positive ΔH.

-  examples of endothermic processes:

• Melting ice cubes.
• Melting solid salts.
• Sublimation of dry ice into carbon dioxide gas.
• Evaporating liquid water.

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