JEE Main Previous Year Papers Questions of Chemistry With Solutions are available at eSaral.
Simulator
Previous Years AIEEE/JEE Mains Questions
Q. Consider the following reaction:
$\mathrm{xMnO}_{4}^{-}+\mathrm{yC}_{2} \mathrm{O}_{4}^{2-}+\mathrm{ZH}^{+} \rightarrow$
$\mathrm{xMn}^{2+}+2 \mathrm{yCO}_{2}+\frac{\mathrm{Z}}{2} \mathrm{H}_{2} \mathrm{O}$
The values of x, y and z in the reaction are respectively :-
(1) 5,2 and 16
(2) 2,5 and 8
(3) 2, 5 and 16
(4) 5,2 and 8
[JEE(Main)-2013]
Ans. (3)
Fact
Q. Given :
$\mathrm{X} \mathrm{Na}_{2} \mathrm{HAsO}_{3}+\mathrm{Y} \mathrm{NaBrO}_{3}+\mathrm{ZHCl} \rightarrow \mathrm{NaBr}$ $+\mathrm{H}_{3} \mathrm{AsO}_{4}+\mathrm{NaCl}$
The values of X, Y and Z in the above redox reaction are respectively :
(1) 2, 1, 3
(2) 3, 1, 6
(3) 2, 1, 2
(4) 3, 1, 4
[JEE(Main-online)-2013]
Ans. (2)
Fact
Q. In which of the following reaction $\mathrm{H}_{2} \mathrm{O}_{2}$ acts as a reducing agent ?
(1) $\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}$
(2) $\mathrm{H}_{2} \mathrm{O}_{2}-2 \mathrm{e}^{-} \rightarrow \mathrm{O}_{2}+2 \mathrm{H}^{+}$
(3) $\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{OH}^{-}$
(4) $\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{OH}^{-}-2 \mathrm{e}^{-} \rightarrow \mathrm{O}_{2}+2 \mathrm{H}_{2} \mathrm{O}$
(1) (1), (3)
(2) (2), (4)
(3) (1), (2)
(4) (3), (4)
[JEE(Main-online)-2014]
Ans. (2)
Fact
Q. Consider the reaction
$\mathrm{H}_{2} \mathrm{SO}_{3(\mathrm{aq})}+\mathrm{Sn}_{(\mathrm{aq})}^{4+}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})} \rightarrow \mathrm{Sn}_{(\mathrm{aq})}^{2+}+\mathrm{HSO}_{4(\mathrm{aq})}^{-}+3 \mathrm{H}_{(\mathrm{aq})}^{+}$
Which of the following statements is correct?
(1) $\mathrm{H}_{2} \mathrm{SO}_{3}$ is the reducing agent because it undergoes oxidation
(2) $\mathrm{H}_{2} \mathrm{SO}_{3}$ is the reducing agent because it undergoes reduction
(3) $\mathrm{Sn}^{4+}$ is the reducing agent because it undergoes oxidation
(4) $\mathrm{Sn}^{4+}$ is the oxidizing agent because it undergoes oxidation
[JEE(Main-online)-2014]
Ans. (1)
Fact
Q. How many electrons are involved in the following redox reaction ?
$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{Fe}^{2+}+\mathrm{C}_{2} \mathrm{O}_{4}^{2-} \rightarrow \mathrm{Cr}^{3+}+\mathrm{Fe}^{3+}+\mathrm{CO}_{2}$ (Unbalanced)
(1) 3 (2) 4 (3) 5 (4) 6
[JEE(Main-online)-2014]
Ans. (4)
Fact
Q. Which of the following reactions is an example of a redox reaction ?
(1) $\mathrm{XeF}_{4}+\mathrm{O}_{2} \mathrm{F}_{2} \rightarrow \mathrm{XeF}_{6}+\mathrm{O}_{2}$
(2) $\mathrm{XeF}_{2}+\mathrm{PF}_{5} \rightarrow[\mathrm{XeF}]^{+} \mathrm{PF}_{6}^{-}$
(3) $\mathrm{XeF}_{6}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{XeOF}_{4}+2 \mathrm{HF}$
(4) $\mathrm{XeF}_{6}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{XeO}_{2} \mathrm{F}_{2}+4 \mathrm{HF}$
[JEE-Main 2017]
Ans. (1)
In the reaction
$\stackrel{+4}{\mathrm{X}} \mathrm{e} \mathrm{F}_{4}+\mathrm{O}_{2} \mathrm{F}_{2} \rightarrow \stackrel{+6}{\mathrm{X}} \mathrm{eF}_{6}+\mathrm{O}_{2}^{0}$
Xenon undergoes oxidation while oxygen undergoes reduction.
Q. An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination ?
[JEE-Main 2018]
[JEE-Main 2018]
Ans. (2)
Methyl orange shows Red(pinkish) color in Acidic medium & yellow color in basic medium
since original solution is basic so
initial color yellow
& Titrated with acid so
Final color pinkish (red)
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