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A small amount of quick lime is taken in a beaker. Water is added slowly to the beaker. Which of the following were noted?
  • a)
    Hissing sound and the solution becomes hot
  • b)
    No characteristic sound and solution turns cold
  • c)
    Hissing sound and the solution becomes cold
  • d)
    No characteristic sound and the solution becomes hot
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A small amount of quick lime is taken in a beaker. Water is added slow...
Observations:

- Hissing sound
- Solution becomes hot

Explanation:

When water is added to quick lime (calcium oxide), a chemical reaction takes place. Calcium oxide is a highly reactive substance and reacts with water vigorously. The reaction is exothermic, which means that it releases heat. The reaction is as follows:

CaO + H2O → Ca(OH)2 + heat

The hissing sound is due to the evolution of steam as a result of the reaction. The heat released during the reaction causes the solution to become hot.

Therefore, option A is the correct answer.

Summary:

- Quick lime reacts with water to form calcium hydroxide and releases heat.
- The reaction is exothermic and causes the solution to become hot.
- The hissing sound is due to the evolution of steam.
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Community Answer
A small amount of quick lime is taken in a beaker. Water is added slow...
When we add quick lime or CaO into water then the water starts heating and it sounds hissing.
It is an exothermic process.
so we need to just visualise the answer and mark correct option
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A small amount of quick lime is taken in a beaker. Water is added slowly to the beaker. Which of the following were noted?a)Hissing sound and the solution becomes hotb)No characteristic sound and solution turns coldc)Hissing sound and the solution becomes coldd)No characteristic sound and the solution becomes hotCorrect answer is option 'A'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about A small amount of quick lime is taken in a beaker. Water is added slowly to the beaker. Which of the following were noted?a)Hissing sound and the solution becomes hotb)No characteristic sound and solution turns coldc)Hissing sound and the solution becomes coldd)No characteristic sound and the solution becomes hotCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A small amount of quick lime is taken in a beaker. Water is added slowly to the beaker. Which of the following were noted?a)Hissing sound and the solution becomes hotb)No characteristic sound and solution turns coldc)Hissing sound and the solution becomes coldd)No characteristic sound and the solution becomes hotCorrect answer is option 'A'. Can you explain this answer?.
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