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(B) Roasting of Malachite $(CuCO_3 \cdot Cu(OH)_2)$ produces $CuO$ (Tenorite),not Cuprite $(Cu_2O)$. Thus,$(A)$ is incorrect.$(B)$ Calcination of Cala

Vedclass · Accepted Answer

$B, C, D$

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(B) Roasting of Malachite $(CuCO_3 \cdot Cu(OH)_2)$ produces $CuO$ (Tenorite),not Cuprite $(Cu_2O)$. Thus,$(A)$ is incorrect.$(B)$ Calcination of Calamine $(ZnCO_3)$ produces Zincite $(ZnO)$: $ZnCO_3 \rightarrow ZnO + CO_2$. Thus,$(B)$ is correct.$(C)$ Copper pyrites $(CuFeS_2)$ is heated with silica $(SiO_2)$ in a reverberatory furnace. $FeO$ reacts with $SiO_2$ to form $FeSiO_3$ (slag): $FeO + SiO_2 \rightarrow FeSiO_3$. Thus,$(C)$ is correct.$(D)$ Impure silver is treated with aqueous $KCN$ in the presence of air $(O_2)$ to form a soluble complex,which is then reduced by $Zn$: $4Ag + 8CN^- + 2H_2O + O_2 \rightarrow 4[Ag(CN)_2]^- + 4OH^-$; $2[Ag(CN)_2]^- + Zn \rightarrow [Zn(CN)_4]^{2-} + 2Ag$. Thus,$(D)$ is correct.Therefore,the correct statements are $(B)$,$(C)$,and $(D)$.

List-$I$ (Property)	List-$II$ (Element/compound)
$I$. Explosive	$A$. $Cu$
$II$. Self-reduction	$B$. $Fe_3O_4$
$III$. Magnetic material	$C$. $Cu(CH_3COO)_2 \cdot Cu(OH)_2$
$IV$. Verdigris	$D$. $Pb(NO_3)_2$

Column $A$	Column $B$
$(1)$ Stainless steel	$(a)$ Riveting
$(2)$ Bronze	$(b)$ Making artifacts
$(3)$ Nitinol	$(c)$ Making coins
$(4)$ German silver	$(d)$ Making musical instruments
	$(e)$ Making surgical instruments

Similar Questions

Stainless steel is an alloy of

Match List-$I$ with List-$II$:

List-$I$ (Property) List-$II$ (Element/compound)

$I$. Explosive $A$. $Cu$

$II$. Self-reduction $B$. $Fe_3O_4$

$III$. Magnetic material $C$. $Cu(CH_3COO)_2 \cdot Cu(OH)_2$

$IV$. Verdigris $D$. $Pb(NO_3)_2$

The process of the extraction of copper from copper pyrites involves:-
$(I)$ Froth floatation $(II)$ Calcination $(III)$ Roasting $(IV)$ Self reduction $(V)$ Smelting $(VI)$ Liquation $(VII)$ Electrorefining

Match the alloys in Column $A$ with their uses in Column $B$:

Column $A$ Column $B$

$(1)$ Stainless steel $(a)$ Riveting

$(2)$ Bronze $(b)$ Making artifacts

$(3)$ Nitinol $(c)$ Making coins

$(4)$ German silver $(d)$ Making musical instruments

$(e)$ Making surgical instruments

Which of the following processes is not used for the extraction of spelter from zinc blende?

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