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Chemical Reactions — CHEMISTRY STD 8 — Question

ICSE BoardEnglish MediumSTD 8CHEMISTRYChemical Reactions2 Marks
Question
Classify the following reactions as decomposition, Also balance the equations.
$(A) \mathrm{CaCO}_3(\mathrm{~s}) \xrightarrow{\text { heat }} \mathrm{CaO}(\mathrm{s})^{+} \mathrm{CO}_2(\mathrm{~g})$
$(B) \mathrm{Zn}(\mathrm{s})+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{ZnSO}_4(\mathrm{~S})+\mathrm{H}_2(\mathrm{~g})$
$(C) \mathrm{AgNO}_3 (aq) +\mathrm{NaCl} (aq) \rightarrow \mathrm{AgCl}(\mathrm{S})+\mathrm{NaNO}_3$
$(D)\mathrm{NH}_3(\mathrm{~g})+\mathrm{HCl}(\mathrm{g}) \rightarrow \mathrm{NH}_4 \mathrm{Cl}(\mathrm{S})$
$(E) \mathrm{CuSO}_4 (aq) +\mathrm{H}_2 \mathrm{~S}(\mathrm{~g}) \rightarrow \mathrm{CuS}(\mathrm{S})+\mathrm{H}_2 \mathrm{SO}_4 (I)$
$(F) \mathrm{} \mathrm{Zn}(\mathrm{S})+\mathrm{CuSO}_4(\mathrm{aq}) \rightarrow \mathrm{ZnSO}_4 \mathrm{~N}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$
$(g) \mathrm{Ca}(\mathrm{s}) \mathrm{O}_2(\mathrm{~g}) \xrightarrow{\text { heat }} \mathrm{CaO}(\mathrm{s})$
$(H) \mathrm{NaOH}+\mathrm{HCl} \rightarrow \mathrm{NaCl}+\mathrm{H}_2 \mathrm{O} $
$(I) \mathrm{KOH}+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{K}_2 \mathrm{SO}_4+\mathrm{H}_2 \mathrm{O}$
✓

Answer

Displacement Reaction:
$(\mathrm{F}) \mathrm{Zn}(\mathrm{S})+\mathrm{CuSO}_4(\mathrm{aq}) \rightarrow \mathrm{ZnSO}_4 \mathrm{~N}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s}) $
$(B) \mathrm{Zn}(\mathrm{s})+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{ZnSO}_4(\mathrm{~S})+\mathrm{H}_2(\mathrm{~g})$

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