Which of the following is the correct word equation for the reaction described below?
mercury(ii) oxide breaks down when it is heated to form oxygen gas and liquid mercury.

a)oxygen gas + mercury → mercury(ii) oxide

b)mercury(ii) oxide + oxygen → mercury

c)mercury → mercury(ii) oxide + oxygen

d)mercury(ii) oxide → oxygen + mercury

Answer is: D) mercury(II) oxide → oxygen + mercury.

Balanced chemical reaction: 2HgO(s) → 2Hg(l) + O₂(g).

This is example of chemical decomposition.

Chemical decomposition is the separation of a single chemical compound (in this example mercury(II) oxide) into its two or more simpler compounds (in this example mercury and oxygen).

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.