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Hydrogen — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrogen5 Marks
Question
  1. Balance and complete the following reactions:
  1. $\text{Fe(s)}+\text{H}_2\text{O}\xrightarrow{\ \ \ \ \ \ \ \ }$
  2. $\text{Zn(s)}+\text{NaOH}(\text{aq})\xrightarrow{\ \ \ \ \ \ \ \ \ \ }$
  3. $\text{Mg(s)}+\text{HNO}_3(\text{aq})\xrightarrow{\ \ \ \ \ \ \ \ \ }$
(b) Write chemical equations for the following:
(1) $H_2O_2$, as an oxidising agent in acidic medium.
(ii) $H_2O_2$ as an reducing agent in basic medium.
(iii) $H_2O_2$ as an reducing agent in basic medium.
(iv) $H_2O_2$ as an reducing agent in acidic medium.
✓

Answer

  1.  
  1. $3\text{Fe}(\text{s})+4\text{H}_2\text{O}_2(\text{g})\rightleftarrows\text{Fe}_3\text{O}_4(\text{s})+4\text{H}_2\text{O}(\text{s})$
  2. $\text{Zn}(\text{s})+2\text{NaOH}(\text{aq})\\\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{Na}_2\text{ZnO}_2(\text{aq})+\text{H}_2(\text{g})$
  3. $\text{Mg}(\text{s})+2\text{HNO}_3\\\xrightarrow{\ \ \ \ \ \ \ \ \ }\text{Mg}^{2+}(\text{aq})+2\text{NO}^-_3(\text{aq})+\text{H}_2(\text{g})$
  1.  

  1. $2\text{Kl}(\text{aq})+\text{H}_2\text{SO}_4(\text{aq})+\text{H}_2\text{O}_2(\text{aq})\\\xrightarrow{\ \ \ \ \ \ \ \ \ \ } \text{K}_2\text{SO}_4(\text{aq})+2\text{H}_2\text{O}(\text{s)}+\text{l}_2(\text{g})$
  2. $2\text{FeCl}_3(\text{aq})+\text{H}_2\text{O}_2(\text{aq})+2\text{NaOH}(\text{aq})\\\xrightarrow{\ \ \ \ \ \ \ \ \ \ }2\text{FeCl}_2(\text{aq})+2\text{H}_2\text{O}(\text{l})+\text{O}_2(\text{g})+2\text{NaCl}(\text{aq})$
  3. $\text{Mn}^{2+}(\text{aq})+\text{H}_2\text{O}_2(\text{aq})\\\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{Mn}^{4+}(\text{aq})+2\text{OH}^-(\text{aq})$
  4. $2\text{KMnO}_4(\text{aq})+3\text{H}_2\text{SO}_4(\text{aq})+5\text{H}_2\text{O}_2(\text{aq})\\\\\xrightarrow{\ \ \ \ \ \ \ \ \ }\text{K}_2\text{SO}_4(\text{aq})+2\text{MnSO}_4(\text{aq})+8\text{H}_2\text{O}(\text{l})+5\text{O}_2(\text{g})$

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