SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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physical change
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chemical change
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neither
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None of the above
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Detailed explanation-1: -It is a chemical decomposition reaction as the mercurric oxide is broken down in to mercury and oxygen.
Detailed explanation-2: -As such, the process of obtaining mercury from heating mercury (II) oxide is a chemical reaction.
Detailed explanation-3: -Mercury(II) oxide, a red solid, decomposes when heated to produce mercury and oxygen gas. Mercury(II) oxide is a red solid. When it is heated, it decomposes into mercury metal and oxygen gas. A reaction is also considered to be a decomposition reaction even when one or more of the products are still compounds.
Detailed explanation-4: -Decomposition is a chemical change because a more complex chemical compound is broken down into simpler compounds or even chemical elements.
Detailed explanation-5: -Mercuric oxide (HgO) decomposes on heating to give mercury (Hg) and oxygen (O2). It is a thermal decomposition reaction and the balanced equation can be written as: 2HgO(s)→heat2Hg(l)+O2(g)