Which of the following compound releases heat when dissolved in water?a)Barium chlorideb)Ammonium chloridec)Lead chlorided)Calcium chlorideCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Calcium chloride releases heat when dissolved in water
Calcium chloride is an exothermic compound, which means it releases heat when dissolved in water. This is due to the high energy released when the compound's ions interact with water molecules.

Explanation:
- Exothermic reaction: When calcium chloride is dissolved in water, the process is exothermic because energy is released in the form of heat. This heat is a result of the strong ionic interactions between the calcium and chloride ions and water molecules.
- Hydration process: When calcium chloride dissociates in water, the calcium ions (Ca2+) and chloride ions (Cl-) are surrounded by water molecules through a process called hydration. This process releases energy in the form of heat due to the formation of new bonds between the ions and water molecules.
- Applications: The exothermic nature of calcium chloride dissolution makes it useful in various applications such as as a de-icer for roads and sidewalks, in concrete setting accelerators, and in heat packs for therapeutic purposes. The heat released upon dissolution helps in melting ice and snow quickly, accelerating concrete curing, and providing warmth in heat packs.
- Safety precautions: While calcium chloride's exothermic properties have practical uses, it is important to handle the compound with care to avoid skin irritation or burns. Proper protective equipment should be used when working with calcium chloride to prevent any potential harm.

Answer

Out of the given options calcium chloride is the only salt which releases heat upon dissolving. Barium chloride and ammonium chloride undergo endothermic dissolution which decreases the temperature of water. However, lead chloride is an insoluble salt and does not dissolve.

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