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Redox Reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions3 Marks
Question
Identify the type of redox reaction taking place in the following.
  1. $3\stackrel{0\ \ \ \ \ \ \ \ \ \ \ \ }{\text{Mg(s)}}+\stackrel{0\ \ \ \ \ \ \ \ \ \ \ }{\text{N}_2\text{(g)}}\ \xrightarrow{\ \ \ \ \ \ \ \ \ \ }\ \stackrel{+2\ \ \ \ -3\ \ \ \ \ \ \ \ }{\text{Mg}_3\text{N}_2\text{(s)}}$
  2. $\stackrel{+5\ \ \ \ \ \ -2\ \ \ \ \ \ \ }{\text{V}_2\text{O}_5\text{(s)}}5\stackrel{0\ \ \ \ \ \ \ \ \ \ }{\text{Ca(s)}}\xrightarrow{\ \ \ \ \ \ \ }2\stackrel{0\ \ \ \ \ \ \ \ }{\text{V(s)}}+\text{5}\stackrel{+2\ \ -2\ \ \ \ \ \ \ \ \ \ }{\text{CaO(s)}}$
  3. $2\stackrel{+1\ +5\ -2\ \ \ \ \ \ \ \ \ \ \ \ }{\text{KClO}_3(\text{s})}\xrightarrow{\ \ \ \ \ \ \ }2\stackrel{+1\ \ -1\ \ \ \ \ \ \ \ \ \ }{\text{KCl(s)}}+3\stackrel{0\ \ \ \ \ \ \ \ \ \ }{\text{O}_2\text{(g)}}$
  4. $\stackrel{0}{\text{Ca}\text{(s)}}+2\stackrel{+1-2}{\text{H}_2\text{O}\text{l}}\ \xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\stackrel{+2\ \ -2+1\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }{\text{Ca(OH)}_2(\text{aq})}+\stackrel{0}{\text{H}}_2\text{(g)}$
  5. $\stackrel{0\ \ \ \ \ \ \ \ \ \ \ }{\text{Br}_2(\text{l})}+\stackrel{-1\ \ \ \ \ \ \ \ \ \ \ \ }{2\text{I}^-(\text{aq})}\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\stackrel{1-}{\text{2Br}^-}(\text{aq})+\stackrel{0\ \ \ \ \ \ \ \ \ \ }{\text{I}_2\text{(s)}}$
✓

Answer

  1. Combination reaction.
  2. Displacement reaction.
  3. Decomposition reaction.
  4. Metal displacement reaction.
  5. Non-metal displacement reaction.
  6. Disproportionation reaction.

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