Chemical & Ionic Equilibrium · JEE Main previous year questions

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2023 40 questions

Q892023 · 13 Apr 2023 · Shift 1· Numerical answer
$25.0 mL$ of $0.050 M$ $Ba (N O_{3})_{2}$ is mixed with $25.0 mL$ of $0.020 M$ $NaF$ . $K_{s p}$ of $BaF_{2}$ is $0.5 \times 1 0^{- 6}$ at $298 K$ . The ratio of $[Ba^{2 +}] [F^{-}]^{2}$ and $K_{s p}$ is ___________. (Nearest integer)
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Answer: 5
Q872023 · 13 Apr 2023 · Shift 2· Numerical answer
At $298 K$ , the standard reduction potential for $C u^{2 +} /Cu$ electrode is $0.34 V$ . Given : $K_{sp} Cu (OH)_{2} = 1 \times 1 0^{- 20}$ Take $\frac{2.303 RT}{F} = 0.059 V$ The reduction potential at $pH = 14$ for the above couple is $(-) x \times 1 0^{- 2} V$ . The value of $x$ is ____
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Answer: 25
Q882023 · 13 Apr 2023 · Shift 2· Numerical answer
$20 mL$ of $0.1 M NaOH$ is added to $50 mL$ of $0.1 M$ acetic acid solution. The $pH$ of the resulting solution is ____ $\times 1 0^{- 2}$ (Nearest integer) Given : $pKa (C H_{3} COOH) = 4.76$ $lo g 2 = 0.30$ $lo g 3 = 0.48$
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Answer: 458
Q852023 · 12 Apr 2023 · Shift 1· Numerical answer
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Answer: 15
Q882023 · 12 Apr 2023 · Shift 1· Numerical answer
An analyst wants to convert $1 L$ $HCl$ of $pH = 1$ to a solution of $HCl$ of $pH 2$ . The volume of water needed to do this dilution is __________ mL. (Nearest integer)
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Answer: 9000
Q872023 · 11 Apr 2023 · Shift 1· Numerical answer
A mixture of $1 mole$ of $H_{2} O$ and $1 mole$ of $CO$ is taken in a $10 litre$ container and heated to $725 K$ . At equilibrium $40%$ of water by mass reacts with carbon monoxide according to the equation : $CO (g) + H_{2} O (g) ⇌ C O_{2} (g) + H_{2} (g)$ The equilibrium constant $K_{c} \times 1 0^{2}$ for the reaction is _________. (Nearest integer)
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Answer: 44
Q832023 · 10 Apr 2023 · Shift 1· Numerical answer
The number of correct statement/s involving equilibria in physical processes from the following is ________ (A) Equilibrium is possible only in a closed system at a given temperature. (B) Both the opposing processes occur at the same rate. (C) When equilibrium is attained at a given temperature, the value of all its parameters became equal. (D) For dissolution of solids in liquids, the solubility is constant at a given temperature.
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Answer: 3
Q902023 · 10 Apr 2023 · Shift 2· Numerical answer
The difference in the oxidation state of $Xe$ between the oxidised product of $Xe$ formed on complete hydrolysis of $XeF_{4}$ and $XeF_{4}$ is _________
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Answer: 2
Q662023 · 8 Apr 2023 · Shift 1
1. A.A-III, B-I, C-IV, D-II
2. B.A-III, B-I, C-II, D-IV
3. C.A-IV, B-III, C-II, D-I
4. D.A-I, B-III, C-IV, D-II
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Answer: A
Q842023 · 8 Apr 2023 · Shift 1· Numerical answer
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Answer: 2
Q642023 · 8 Apr 2023 · Shift 2
A compound 'X' when treated with phthalic anhydride in presence of concentrated $H_{2} S O_{4}$ yields 'Y'. 'Y' is used as an acid/base indicator. 'X' and 'Y' are respectively
1. A.Toluidine, Phenolphthalein
2. B.Carbolic acid, Phenolphthalein
3. C.Salicylaldehyde, Phenolphthalein
4. D.Anisole, methyl orange
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Answer: B
Q662023 · 8 Apr 2023 · Shift 2
Given below are two statements: Statement I : In redox titration, the indicators used are sensitive to change in $pH$ of the solution. Statement II : In acid-base titration, the indicators used are sensitive to change in oxidation potential. In the light of the above statements, choose the most appropriate answer from the options given below
1. A.Both Statement I and Statement II are incorrect
2. B.Statement I is correct but Statement II is incorrect
3. C.Statement I is incorrect but Statement II is correct
4. D.Both Statement I and Statement II are correct
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Answer: A
Q832023 · 8 Apr 2023 · Shift 2· Numerical answer
The solubility product of $BaS O_{4}$ is $1 \times 1 0^{- 10}$ at $298 K$ . The solubility of $BaS O_{4}$ in $0.1 M K_{2} S O_{4} (aq)$ solution is ____ $\times 1 0^{- 9} g L^{- 1}$ (nearest integer). Given: Molar mass of $BaS O_{4}$ is $233 g mo l^{- 1}$
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Answer: 233
Q852023 · 8 Apr 2023 · Shift 2· Numerical answer
For complete combustion of ethene. $C_{2} H_{4} (g) + 3 O_{2} (g) \to 2C O_{2} (g) + 2 H_{2} O (l)$ the amount of heat produced as measured in bomb calorimeter is $1406 kJ mo l^{- 1}$ at $300 K$ . The minimum value of $TΔS$ needed to reach equilibrium is $(-)$ ____ $kJ$ . (Nearest integer) Given : $R = 8.3 J K^{- 1} mo l^{- 1}$
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Answer: 1411
Q662023 · 6 Apr 2023 · Shift 1
For a concentrated solution of a weak electrolyte ( $K_{e q} = equilibrium constant$ ) $A_{2} B_{3}$ of concentration ' $c$ ', the degree of dissociation ' $α$ ' is :
1. A. $(\frac{K _{e q}}{25 c ^{2}})^{\frac{1}{5}}$
2. B. $(\frac{K _{e q}}{108 c ^{4}})^{\frac{1}{5}}$
3. C. $(\frac{K _{e q}}{5 c ^{4}})^{\frac{1}{5}}$
4. D. $(\frac{K _{e q}}{6 c ^{5}})^{\frac{1}{5}}$
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Answer: B
Q612023 · 6 Apr 2023 · Shift 2
Formation of which complex, among the following, is not a confirmatory test of $P b^{2 +}$ ions :
1. A.lead chromate
2. B.lead iodide
3. C.lead sulphate
4. D.lead nitrate
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Answer: D
Q852023 · 6 Apr 2023 · Shift 2· Numerical answer
The equilibrium composition for the reaction $PC l_{3} + C l_{2} ⇌ PC l_{5}$ at $298 K$ is given below: $[PC l_{3}]_{eq} = 0.2 mol L^{- 1}$ , $[C l_{2}]_{eq} = 0.1 mol L^{- 1}$ , $[PC l_{5}]_{eq} = 0.40 mol L^{- 1}$ If $0.2 mol$ of $C l_{2}$ is added at the same temperature, the equilibrium concentration of $PC l_{5}$ is ___________ $\times 1 0^{- 2} mol L^{- 1}$ Given : $K_{c}$ for the reaction at $298 K$ is $20$
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Answer: 49
Q882023 · 6 Apr 2023 · Shift 2· Numerical answer
Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is / are ___________. A. $1 M aq. NaCl$ and $2 M aq. urea$ B. $1 M aq. CaCl_{2}$ and $1.5 M aq. KCl$ C. $1.5 M aq. AlCl_{3}$ and $2 M aq. Na_{2} SO_{4}$ D. $2.5 M aq. KCl$ and $1 M aq. Al_{2} (SO_{4})_{3}$
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Answer: 4
Q622023 · 1 Feb 2023 · Shift 1
Which of the following are the example of double salt? A. $FeSO_{4} \cdot (NH_{4})_{2} SO_{4} \cdot 6 H_{2} O$ B. $CuSO_{4} \cdot 4 NH_{3} \cdot H_{2} O$ C. $K_{2} SO_{4} \cdot Al_{2} (SO_{4})_{3} \cdot 24 H_{2} O$ D. $Fe (CN)_{2} \cdot 4 KCN$ Choose the correct answer :
1. A.A, B and D only
2. B.B and D only
3. C.A and B only
4. D.A and C only
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Answer: D
Q892023 · 1 Feb 2023 · Shift 1· Numerical answer
(i) $X (g) ⇌ Y (g) + Z (g) K_{p 1} = 3$ (ii) $A (g) ⇌ 2 B (g) K_{p 2} = 1$ If the degree of dissociation and initial concentration of both the reactants $X (g)$ and $A (g)$ are equal, then the ratio of the total pressure at equilibrium $(\frac{p _{1}}{p _{2}})$ is equal to $x : 1$ . The value of $x$ is ________ (Nearest integer)
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Answer: 12
Q822023 · 31 Jan 2023 · Shift 1· Numerical answer
The logarithm of equilibrium constant for the reaction $Pd^{2 +} + 4 Cl^{-} ⇌ PdCl_{4}^{2 -}$ is __________ (Nearest integer) Given : $\frac{2.303 R T}{F} = 0.06 V$ $Pd_{(aq)}^{2 +} + 2 e^{-} ⇌ Pd (s) E^{⊖} = 0.83 V$ $PdCl_{4}^{2 -} (aq) + 2 e^{-} ⇌ Pd (s) + 4 Cl^{-} (aq) E^{⊖} = 0.65 V$
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Answer: 6
Q732023 · 31 Jan 2023 · Shift 2
The incorrect statement for the use of indicators in acid-base titration is :
1. A.Phenolphthalein is a suitable indicator for a weak acid vs strong base titration.
2. B.Methyl orange may be used for a weak acid vs weak base titration.
3. C.Methyl orange is a suitable indicator for a strong acid vs weak base titration.
4. D.Phenolphthalein may be used for a strong acid vs strong base titration.
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Answer: B
Q742023 · 31 Jan 2023 · Shift 2
The normal rain water is slightly acidic and its $pH$ value is 5.6 because of which one of the following?
1. A. $N_{2} O_{5} + H_{2} O \to 2 HNO_{3}$
2. B. $2 SO_{2} + O_{2} + 2 H_{2} O \to 2 H_{2} SO_{4}$
3. C. $4 NO_{2} + O_{2} + 2 H_{2} O \to 4 HNO_{3}$
4. D. $CO_{2} + H_{2} O \to H_{2} CO_{3}$
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Answer: D
Q792023 · 31 Jan 2023 · Shift 2
The Lewis acid character of boron tri halides follows the order :
1. A. $BI_{3} > BBr_{3} > BCl_{3} > BF_{3}$
2. B. $BCl_{3} > BF_{3} > BBr_{3} > BI_{3}$
3. C. $BF_{3} > BCl_{3} > BBr_{3} > BI_{3}$
4. D. $BBr_{3} > BI_{3} > BCl_{3} > BF_{3}$
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Answer: A
Q852023 · 31 Jan 2023 · Shift 2· Numerical answer
At $298 K$ , the solubility of silver chloride in water is $1.434 \times 1 0^{- 3} g L^{- 1}$ . The value of $- lo g K_{sp}$ for silver chloride is ___________. (Given mass of Ag is $107.9 g mol^{- 1}$ and mass of Cl is $35.5 g mol^{- 1}$ )
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Answer: 10