Question
A thermal decomposition reaction in which a metallic nitrate decomposes to give $–$ a basic oxide.
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Answer
Metallic nitrate is calcium nitrate on thermal decomposition gives $\ce{CaO}$ which is a basic oxide.
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Classify the following reactions as decomposition, Also balance the equations.
$(A) \mathrm{CaCO}_3(\mathrm{~s}) \xrightarrow{\text { heat }} \mathrm{CaO}(\mathrm{s})^{+} \mathrm{CO}_2(\mathrm{~g})$
$(B) \mathrm{Zn}(\mathrm{s})+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{ZnSO}_4(\mathrm{~S})+\mathrm{H}_2(\mathrm{~g})$
$ (C) \mathrm{AgNO}_3$ (aq) $+\mathrm{NaCl}$ (aq) $\rightarrow \mathrm{AgCl}(\mathrm{S})+\mathrm{NaNO}_3$
$(D) \mathrm{NH}_3(\mathrm{~g})+\mathrm{HCl}(\mathrm{g}) \rightarrow \mathrm{NH}_4 \mathrm{Cl}(\mathrm{S})$
$(E) \mathrm{CuSO}_4$ (aq) $+\mathrm{H}_2 \mathrm{~S}(\mathrm{~g}) \rightarrow \mathrm{CuS}(\mathrm{S})+\mathrm{H}_2 \mathrm{SO}_4(\mathrm{I})$
$(F) \mathrm{} \mathrm{Zn}(\mathrm{S})+\mathrm{CuSO}_4(\mathrm{aq}) \rightarrow \mathrm{ZnSO}_4 \mathrm{~N}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$
$(g) \mathrm{Ca}(\mathrm{s}) \mathrm{O}_2(\mathrm{~g}) \xrightarrow{\text { heat }} \mathrm{CaO}(\mathrm{s})$
$(H) \mathrm{NaOH}+\mathrm{HCl} \rightarrow \mathrm{NaCl}+\mathrm{H}_2 \mathrm{O}$
$(I) \mathrm{KOH}+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{K}_2 \mathrm{SO}_4+\mathrm{H}_2 \mathrm{O}$
→$(A) \mathrm{CaCO}_3(\mathrm{~s}) \xrightarrow{\text { heat }} \mathrm{CaO}(\mathrm{s})^{+} \mathrm{CO}_2(\mathrm{~g})$
$(B) \mathrm{Zn}(\mathrm{s})+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{ZnSO}_4(\mathrm{~S})+\mathrm{H}_2(\mathrm{~g})$
$ (C) \mathrm{AgNO}_3$ (aq) $+\mathrm{NaCl}$ (aq) $\rightarrow \mathrm{AgCl}(\mathrm{S})+\mathrm{NaNO}_3$
$(D) \mathrm{NH}_3(\mathrm{~g})+\mathrm{HCl}(\mathrm{g}) \rightarrow \mathrm{NH}_4 \mathrm{Cl}(\mathrm{S})$
$(E) \mathrm{CuSO}_4$ (aq) $+\mathrm{H}_2 \mathrm{~S}(\mathrm{~g}) \rightarrow \mathrm{CuS}(\mathrm{S})+\mathrm{H}_2 \mathrm{SO}_4(\mathrm{I})$
$(F) \mathrm{} \mathrm{Zn}(\mathrm{S})+\mathrm{CuSO}_4(\mathrm{aq}) \rightarrow \mathrm{ZnSO}_4 \mathrm{~N}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$
$(g) \mathrm{Ca}(\mathrm{s}) \mathrm{O}_2(\mathrm{~g}) \xrightarrow{\text { heat }} \mathrm{CaO}(\mathrm{s})$
$(H) \mathrm{NaOH}+\mathrm{HCl} \rightarrow \mathrm{NaCl}+\mathrm{H}_2 \mathrm{O}$
$(I) \mathrm{KOH}+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{K}_2 \mathrm{SO}_4+\mathrm{H}_2 \mathrm{O}$
(a) Define mixture.
(b) State main characteristics of mixture.
(b) State main characteristics of mixture.
Balance the following equations : $\ce{Al + H_3O \rightarrow Al_3O_2}+ H _2$
→Give reasons : A gas can fill the whole vessel in which it is enclosed.
Draw the structure of the following atoms showing the nucleus containing $–$ protons, neutrons and the orbits with the respective electrons : Lithium $[$At. no. $= 3,$ Mass no. $= 7]$
→What is variable valency? Name two elements having variable valency and state their valencies.
Describe the structure of graphite.
Draw neat labelled diagrams for two different experiments to prove that $–$ hydrogen is lighter than air.
→The valency of aluminium is $3.$ Write the valency of other radicals present in the following compounds of Aluminium oxide.
→Balance the following equations : $Al + \ce{H_2SO_4} \rightarrow \ce{Al_2\left(SO_4\right)_4}+ H _2$
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