Which one of the following when dissolved in H2O gives hissing sound

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Q: 63 (CDS-I/2009)
Which one of the following when dissolved in H2O gives hissing sound

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,8,17,11,2,4,8

keywords: 

{'limestone': [2, 0, 1, 0], 'soda lime': [0, 0, 1, 0], 'h2o': [0, 0, 2, 3], 'lime': [1, 0, 5, 12], 'sound': [4, 3, 10, 15]}

When dissolved in water, option 4, Quicklime, gives a hissing sound. Quicklime, also known as calcium oxide (CaO), is a white crystalline solid that is produced by heating limestone in a kiln. When water is added to quicklime, a chemical reaction occurs called slaking, which produces calcium hydroxide (Ca(OH)2), also known as slaked lime. This reaction is exothermic, meaning it releases heat energy.

The hissing sound is produced because of the rapid release of heat during the hydration process. As water comes into contact with quicklime, it reacts vigorously, releasing steam and producing an audible hissing sound. This sound is a result of the violent reaction as the water molecules break apart and rearrange to form the hydrated form of calcium oxide.

It is important to note that the other options listed, limestone (option 1), slaked lime (option 2), and soda lime (option 3), do not produce a hissing sound when dissolved in water. Therefore, the correct answer is option 4, Quicklime.

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