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Stoichiometry

Why 2 HgO on ...

Question

Why 2HgO on heating gives Hg+O₂ ?

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Solution

A decomposition reaction occurs when a chemical compound is broken down into elements or smaller compounds. The generalised equation for a decomposition reaction is:

AB →→ A + B

Mercury oxide when heated in air will decompose to give elemental mercury, a liquid metal, and oxygen gas. It is mercury (II) oxide or mercury (I) oxide.

The balanced equation for mercury (II) oxide:
2HgO + heat ---> 2Hg + O2

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Q. The decomposition of mercuric oxide (

H g)

) on heating, resulting in the formation of mercury and oxygen, is represented by the following chemical equation-

2 H g O + 180 k J ⟶ 2 H g + O_{2}

Which one of the following represents the heat of formation of mercuric oxide?

N a N O_{3}

Q. Name the type of chemical reaction.

2 H g O \to 2 H g + O_{2}

H_{2} O_{2}

under goes dispropontionation on heating. Reason: It gives

H_{2} O

O_{2}

Q. Which of the following is not a combination reaction?
(a) CaO + CO₂ ⟶ CaCO₃
(b) 2HgO ⟶ 2Hg + O₂
(c) 2H₂ + O₂ ⟶ 2H₂O
(d) C + O₂ ⟶ CO₂

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