Tag: effects of oxidation reactions in daily life

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Multiple choice chemistry changes - physical and chemical effects of oxidation reactions in daily life corrosion of metals electroplating and its application

The tarnishing of silver ornaments in atmosphere is due to:

  1. $Ag _{2}O$
  2. $Ag _{2}S$
  3. $Ag _{2}CO _{3}$
  4. $Ag _{2}SO _{4}$
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

The tarnishing of silver ornaments in atmosphere is due to formation of silver oxide $Ag _{2}O$ and silver sulphide $Ag _{2}S$.

$2Ag\, +\, \displaystyle 
\frac{1}{2}{O _{2}}\, \rightarrow\, Ag _{2}O$

$2Ag\, +\, H _{2}S\, \rightarrow\, Ag _{2}S\, +\, H _{2}$

Hence, option A and B are correct.

Multiple choice chemistry changes - physical and chemical effects of oxidation reactions in daily life corrosion of metals electroplating and its application

Which metal is protected by a layer of its own oxide?

  1. $Al$
  2. $Ag$
  3. $Au$
  4. $Fe$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aluminium in air is ordinarily protected by a molecule-thin layer of its own oxide. This aluminium oxide layer serves as a protective barrier to the underlying aluminium itself and preventing chemical reactions with the metal.