d- and f-Block Elements · JEE Main previous year questions

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2022 13 questions

Q642022 · 29 Jul 2022 · Shift 1
The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :
1. A. $Zn (OH)_{2}$
2. B. $ZnO$
3. C. $[Zn (OH)_{4}]^{2 -}$
4. D. $[Zn O_{2}]^{2 -}$
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Answer: C
Q662022 · 29 Jul 2022 · Shift 1
In following pairs, the one in which both transition metal ions are colourless is :
1. A. $S c^{3 +}$ , $Z n^{2 +}$
2. B. $T i^{4 +}$ , $C u^{2 +}$
3. C. $V^{2 +}$ , $T i^{3 +}$
4. D. $Z n^{2 +}$ , $M n^{2 +}$
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Answer: A
Q662022 · 27 Jul 2022 · Shift 1
Given below are two statements. Statement I : Iron (III) catalyst, acidified $K_{2} Cr_{2} O_{7}$ and neutral $KMnO_{4}$ have the ability to oxidise $I^{-}$ to $I_{2}$ independently. Statement II : Manganate ion is paramagnetic in nature and involves $p π - p π$ bonding. In the light of the above statements, choose the correct answer from the options given below.
1. A.Both Statement I and Statement II are true.
2. B.Both Statement I and Statement II are false.
3. C.Statement I is true but Statement II is false.
4. D.Statement I is false but Statement II is true.
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Answer: B
Q862022 · 27 Jul 2022 · Shift 2· Numerical answer
The spin only magnetic moment of the complex present in Fehling's reagent is __________ B.M. (Nearest integer).
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Answer: 2
Q882022 · 26 Jul 2022 · Shift 1· Numerical answer
The difference between spin only magnetic moment values of $[Co (H_{2} O)_{6}] C l_{2}$ and $[Cr (H_{2} O)_{6}] C l_{3}$ is ____.
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Answer: 0
Q752022 · 25 Jul 2022 · Shift 2
Given below are two statements. Statement I : Pig iron is obtained by heating cast iron with scrap iron. Statement II : Pig iron has a relatively lower carbon content than that of cast iron. In the light of the above statements, choose the correct answer from the options given below.
1. A.Both Statement I and Statement II are correct.
2. B.Both Statement I and Statement II are not correct.
3. C.Statement I is correct but Statement II is not correct.
4. D.Statement I is not correct but Statement II is correct.
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Answer: B
Q812022 · 30 Jun 2022 · Shift 1· Numerical answer
Blister copper is produced by reaction of copper oxide with copper sulphide. $2 C u_{2} O + C u_{2} S \to 6 Cu + S O_{2}$ When $2.86 \times 1 0^{3} g$ of $C u_{2} O$ and $4.77 \times 1 0^{3} g$ of $C u_{2} S$ are used for reaction, the mass of copper produced is ___________ g. (nearest integer) (Atomic mass of $Cu = 63.5 a.m. u$ , $S = 32.0 a.m. u$ , $O = 16.0 a.m. u$ )
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Answer: 3810
Q862022 · 30 Jun 2022 · Shift 1· Numerical answer
Spin only magnetic moment ( $μ_{s}$ ) of $K_{3} [F e (C N)_{6}]$ is ___________ B.M. (Nearest integer)
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Answer: 2
Q742022 · 28 Jun 2022 · Shift 2
In the metallurgical extraction of copper, following reaction is used : $FeO + Si O_{2} \to FeSi O_{3}$ $FeO$ and $FeSi O_{3}$ respectively are.
1. A.gangue and flux.
2. B.flux and slag.
3. C.slag and flux.
4. D.gangue and slag.
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Answer: D
Q872022 · 27 Jun 2022 · Shift 1· Numerical answer
Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the manganese product formed from the above reaction is ____________ B.M. (Nearest integer)
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Answer: 6
Q852022 · 26 Jun 2022 · Shift 1· Numerical answer
The spin-only magnetic moment value of the most basic oxide of vanadium among $V_{2} O_{3}$ , $V_{2} O_{4}$ and $V_{2} O_{5}$ is ________ B.M. (Nearest integer)
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Answer: 3
Q682022 · 25 Jun 2022 · Shift 2
The metal ion (in gaseous state) with lowest spin-only magnetic moment value is :
1. A. $V^{2 +}$
2. B. $N i^{2 +}$
3. C. $C r^{2 +}$
4. D. $F e^{2 +}$
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Answer: B
Q902022 · 24 Jun 2022 · Shift 2· Numerical answer
(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?
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Answer: 3