JEE Advanced Previous Year Questions of Chemistry with Solutions are available at eSaral. Practicing JEE Advanced Previous Year Papers Questions of Chemistry will help the JEE aspirants in realizing the question pattern as well as help in analyzing weak & strong areas.
Simulator
Previous Years JEE Advance Questions
Paragraph for questions 1 to 3
Copper is the most nobel of the first row transition metals and occurs in small deposits in several
countries. Ores of copper include chalcanthite $\left(\mathrm{CuSO}_{4}, 5 \mathrm{H}_{2} \mathrm{O}\right),$ atacamite $\left(\mathrm{Cu}_{2} \mathrm{Cl}(\mathrm{OH})_{3}\right),$ cuprite $\left(\mathrm{Cu}_{2} \mathrm{O}\right),$ copper glance (Cu.S) and malachite $\left(\mathrm{Cu}_{2}(\mathrm{OH})_{2} \mathrm{CO}_{3}\right) .$ However, $80 \%$ of the world copper production comes from the ore chalcopyrite (CuFeS_{2} ) . \text { The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.
(A) $\mathrm{Cu}_{2} \mathrm{S}$ and $\mathrm{FeO}$ (B) $\mathrm{Cu}_{2} \mathrm{O}$ and FeO (C) $\mathrm{CuS}$ and $\mathrm{Fe}_{2} \mathrm{O}_{3}$ (D) $\mathrm{Cu}_{2} \mathrm{O}$ and $\mathrm{Fe}_{2} \mathrm{O}_{3}$ [JEE-2010]
(A) FeO (B) FeS (C) $\mathrm{Fe}_{2} \mathrm{O}_{3}$ (D) FeSiO $_{3}$ [JEE-2010]
(A) S (B) $\mathrm{O}^{2-}$ (C) $\mathrm{S}^{2-}$ (D) $\mathrm{SO}_{2}$ [JEE-2010]
(A) carbon reduction of an oxide ore (B) self-reduction of a sulphide ore (C) removal of copper impurity (D) removal of iron impurity [JEE-2011]
$\mathrm{SnO}_{2}+2 \mathrm{C} \rightarrow \mathrm{Sn}+2 \mathrm{CO}$ Cassetrite contains impurity of Wolframite (FeWO,), Which is a ferro magnatic.
(A) II, III in haematite and III in magnetite (B) II, III in haematite and II in magnetite (C) II in haematite and II, III in magnetite (D) III in haematite and II, III in magnetite [JEE-2011]
Haematite Ore $\Rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3} ;$ Oxidation state $(+3)$ magnetite ore $\Rightarrow \mathrm{Fe}_{3} \mathrm{O}_{4}\left(\mathrm{FeO}+\mathrm{Fe}_{2} \mathrm{O}_{3}\right)=$ Oxidation state of $(+2 \&+3)$
(A) $\mathrm{O}_{2}$ and CO respectively. (B) $\mathrm{O}_{2}$ and $\mathrm{Zn}$ dust respectively. (C) $\mathrm{HNO}_{3}$ and $\mathrm{Zn}$ dust respectively. (D) $\mathrm{HNO}_{3}$ and CO respectively. [JEE-2012]
$2 \mathrm{Ag}+4 \mathrm{NaCN}+\mathrm{H}_{2} \mathrm{O}+\frac{1}{2} \mathrm{O}_{2}(\text { air }) \longrightarrow 2 \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]+2 \mathrm{NaOH},$ Here $\mathrm{O}_{2}$ is oxidising agent $\& \mathrm{Zn}^{-}$ dust act as reducing agent.
(A) Ag, Cu and Pb (B) Ag, Cu and Sn (B) Ag, Cu and Sn (D) Al, Cu and Pb [JEE-2013]
(A) $\operatorname{tin}$ from $\mathrm{SnO}_{2}$ (B) Iron from $\mathrm{Fe}_{2} \mathrm{O}_{3}$ (C) aluminium from $\mathrm{Al}_{2} \mathrm{O}_{3}$ (D) magnesium from $\mathrm{MgCO}_{3} . \mathrm{CaCO}_{3}$ [JEE-2013]
Being a more reactive metal “Al” and “Mg” can be reduced by electrolytic reduction.
(A) CuFeS $_{2}$ (B) CuO (C) $\mathrm{Cu}_{2} \mathrm{O}$ (D) $\mathrm{CuSO}_{4}$ [JEE Adv. 2015]
(A) Impure Cu strip is used as cathode (B) Acidified aqueuous $\mathrm{CuSO}_{4}$ is used as electrolyte (C) Pure Cu deposits at cathode (D) Impurities settle as anode-mud [JEE Adv. 2015]
Impure “Cu” act as a Anode . While ” Pure thin strips of Cu act as cathode and aqueous solution of $\mathrm{CuSO}_{4}$ act as electrolyte.
Column-II – [JEE Adv. 2015]
Name of ores & their metals.
(Atomic weights in $\left.\mathrm{g} \text { mol }^{-1}: \mathrm{O}=16, \mathrm{S}=32, \mathrm{Pb}=207\right)$ [JEE Adv. 2018]
