Write balanced chemical equations for the following statements: |
(i) NaOH solution is heated with zinc granules. |
(ii) Excess of carbon dioxide gas is passed through lime water. |
(iii) Dilute sulphuric acid reacts with sodium carbonate. |
(iv) Egg shells are dropped in hydrochloric acid. |
(v) Copper (II) oxide reacts with dilute hydrochloric acid. |
Answer:
(i) \[\underset{\begin{smallmatrix} \text{ Sodium } \\ \text{hydroxide} \end{smallmatrix}}{\mathop{2NaOH(aq)}}\,+\underset{\text{Zinc}}{\mathop{Zn(s)}}\,\xrightarrow{\Delta }\underset{\text{Sodium zincate}}{\mathop{N{{a}_{2}}Zn{{O}_{2}}(aq)}}\,+\underset{\text{Hydrogen}}{\mathop{{{H}_{2}}(g)}}\,\] (ii) \[\underset{\text{Lime water}}{\mathop{Ca{{(OH)}_{2}}}}\,+C{{O}_{2}}\to \underset{\begin{smallmatrix} \text{Calcium carbonate} \\ \text{ (white ppt}\text{.)} \end{smallmatrix}}{\mathop{CaC{{O}_{3}}(s)}}\,+{{H}_{2}}O\] \[CaC{{O}_{3}}(s)+\mathrm{ }C{{O}_{2}}(g)+\mathrm{ }{{H}_{2}}O(l)\to \underset{\begin{smallmatrix} \text{ Calcium hydrogen} \\ \text{carbonate (Soluble in water)} \end{smallmatrix}}{\mathop{Ca(HC{{O}_{3}})(aq)}}\,\] (iii) \[{{H}_{2}}S{{O}_{4}}(dil.)+\mathrm{ }N{{a}_{2}}C{{O}_{3}}(s)\to \underset{Sodium\text{ }sulphate}{\mathop{N{{a}_{2}}S{{O}_{4}}}}\,+C{{O}_{2}}+{{H}_{2}}O\] (iv) \[\underset{\begin{smallmatrix} \text{Egg shell contains} \\ \text{calcium carbonate} \end{smallmatrix}}{\mathop{CaC{{O}_{3}}(s)}}\,+\mathrm{ }2HCl\to CaC{{l}_{2}}\mathrm{+}{{H}_{2}}O+C{{O}_{2}}\] (v) \[CuO(s)+\mathrm{ }2HCl(aq)\to \underset{\begin{smallmatrix} \text{Copper chloride} \\ \text{ (blue green)} \end{smallmatrix}}{\mathop{CuC{{l}_{2}}(aq)}}\,+{{H}_{2}}O(l)\]
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