Other Chemistry · JEE Main previous year questions

650 questions asked across 20 exam years, newest first

Other Chemistry has appeared 650 times in JEE Main papers between 2002 and 2026, about 4.7 questions per paper, from 25 per paper in 2002 to 2.6 per paper in 2026. Every question is listed below with its answer and the paper it came from. Use Practise this topic to attempt them as a timed set.

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2025 34 questions

Q642025 · 3 Apr 2025 · Shift 1
Among $1 0^{- 9} g$ (each) of the following elements, which one will have the highest number of atoms? Element: Pb, Po, Pr and Pt
1. A.Pr
2. B.Pt
3. C.Po
4. D.Pb
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Answer: A
Q752025 · 3 Apr 2025 · Shift 1· Numerical answer
Given : $Δ H^{⊖}_{sub} [C (graphite)] = 710 kJ mol^{- 1}$ $Δ_{C - H} H^{⊖} = 414 kJ mol^{- 1}$ $Δ_{H - H} H^{⊖} = 436 kJ mol^{- 1}$ $Δ_{C = C} H^{⊖} = 611 kJ mol^{- 1}$ The $Δ H_{f}^{⊖}$ for $CH_{2} = CH_{2}$ is________ $kJ mol^{- 1}$ (nearest integer value)
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Answer: 25
Q512025 · 2 Apr 2025 · Shift 1
1. A.III, II
2. B.II, IV
3. C.I, IV
4. D.II, I
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Answer: D
Q522025 · 2 Apr 2025 · Shift 1
$CaCO_{3} (s) + 2 HCl (aq) \to CaCl_{2} (aq) + CO_{2} (g) + H_{2} O (l)$ Consider the above reaction, what mass of $CaCl_{2}$ will be formed if $250 mL$ of $0.76 M HCl$ reacts with $1000 g$ of $CaCO_{3}$ ? (Given : Molar mass of Ca, C, O, H and Cl are $40, 12, 16, 1$ and $35.5 g mol^{- 1}$ , respectively)
1. A.3.908 g
2. B.2.636 g
3. C.10.545 g
4. D.5.272 g
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Answer: C
Q652025 · 2 Apr 2025 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: B
Q672025 · 2 Apr 2025 · Shift 1
Identify the correct statement among the following :
1. A.All naturally occurring amino acids except glycine contain one chiral centre.
2. B.Amino acid, cysteine can easily undergo dimerisation due to the presence of free SH group.
3. C.Glutamic acid is the only amino acid that contains a $- COOH$ group at the side chain.
4. D.All naturally occurring amino acids are optically active.
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Answer: B
Q712025 · 2 Apr 2025 · Shift 1· Numerical answer
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Answer: 2435
Q722025 · 2 Apr 2025 · Shift 1· Numerical answer
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Answer: 372
Q512025 · 2 Apr 2025 · Shift 2
Given below are two statements : Statement (I) : Neopentane forms only one monosubstituted derivative. Statement (II) : Melting point of neopentane is higher than n-pentane. In the light of the above statements, choose the most appropriate answer from the options given below :
1. A.Statement I is incorrect but Statement II is correct
2. B.Both Statement I and Statement II are correct
3. C.Statement I is correct but Statement II is incorrect
4. D.Both Statement I and Statement II are incorrect
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Answer: B
Q612025 · 2 Apr 2025 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q622025 · 2 Apr 2025 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q712025 · 2 Apr 2025 · Shift 2· Numerical answer
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Answer: 43
Q712025 · 29 Jan 2025 · Shift 2· Numerical answer
Total number of non-bonded electrons present in $N O_{2}^{-}$ ion based on Lewis theory is ____.
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Answer: 12
Q622025 · 28 Jan 2025 · Shift 1
1. A.A and C Only
2. B.A, B and E Only
3. C.A and B Only
4. D.A, C and D Only
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Answer: D
Q692025 · 28 Jan 2025 · Shift 1
The molecules having square pyramidal geometry are
1. A. $Br F_{5} & PC l_{5}$
2. B. $Sb F_{5} & PC l_{5}$
3. C. $Br F_{5} & XeO F_{4}$
4. D. $Sb F_{5} & XeO F_{4}$
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Answer: C
Q702025 · 28 Jan 2025 · Shift 1
Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15 K . If pressure of the system is increased 2 times, keeping temperature constant, then identify correct observation from following
1. A.Liquid phase disappears completely.
2. B.The amount of ice decreases.
3. C.The solid phase (ice) disappears completely.
4. D.Volume of system increases .
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Answer: C
Q512025 · 24 Jan 2025 · Shift 1
For a reaction, $N_{2} O_{5 (g)} \to 2N O_{2 (g)} + \frac{1}{2} O_{2 (g)}$ in a constant volume container, no products were present initially. The final pressure of the system when $50%$ of reaction gets completed is
1. A. $5/2 times of initial pressure$
2. B. $7/2 times of initial pressure$
3. C. $7/4 times of initial pressure$
4. D. $5 times of initial pressure$
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Answer: C
Q652025 · 24 Jan 2025 · Shift 1
Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?
1. A.acetophenone < benzaldehyde < p-tolualdehyde < p-nitrobenzaldehyde
2. B.acetophenone < p-tolualdehyde < benzaldehyde < p-nitrobenzaldehyde
3. C.p-nitrobenzaldehyde < benzaldehyde < p-tolualdehyde < acetophenone
4. D.benzaldehyde < acetophenone < p-nitrobenzaldehyde < p-tolualdehyde
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Answer: B
Q692025 · 24 Jan 2025 · Shift 1
1. A.Q
2. B.S
3. C.P
4. D.R
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Answer: A
Q612025 · 24 Jan 2025 · Shift 2
Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature?
1. A.50 mL HCl and 20 mL NaOH
2. B.30 mL HCl and 30 mL NaOH
3. C.45 mL $C H_{3} COOH$ and 25 mL NaOH
4. D.30 mL $C H_{3} COOH$ and 30 mL NaOH
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Answer: B
Q702025 · 24 Jan 2025 · Shift 2
Identify correct statement/s : (A) $- OC H_{3}$ and $- NHCOC H_{3}$ are activating group. (B) $- CN$ and -OH are meta directing group. (C) -CN and $- S O_{3} H$ are meta directing group. (D) Activating groups act as ortho - and para directing groups. (E) Halides are activating groups. Choose the correct answer from the options given below :
1. A.(A), (C) and (D) only
2. B.(A), (B) and (E) only
3. C.(A) and (C) only
4. D.(A) only
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Answer: A
Q742025 · 24 Jan 2025 · Shift 2· Numerical answer
The observed and normal molar masses of compound $M X_{2}$ are $65.6$ and $164$ respectively. The percent degree of ionisation of $M X_{2}$ is ____%. (Nearest integer)
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Answer: 75
Q532025 · 23 Jan 2025 · Shift 2
Match List - I with List - II | | List - I | | List - II | |---|---|---|---| | (A) | Bronze | (I) | Cu, Ni | | (B) | Brass | (II) | Fe, Cr, Ni, C | | (C) | UK silver coin | (III) | Cu, Zn | | (D) | Stainless steel | (IV) | Cu, Sn | Choose the correct answer from the options given below :
1. A.(A)-(IV), (B)-(II), (C)-(III), (D)-(I)
2. B.(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
3. C.(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
4. D.(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
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Answer: B
Q672025 · 23 Jan 2025 · Shift 2
1. A.(C) < (D) < (B) < (A)
2. B.(D) < (A) < (B) < (C)
3. C.(D) < (B) < (A) < (C)
4. D.(C) < (B) < (A) < (D)
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Answer: B
Q602025 · 22 Jan 2025 · Shift 1
A liquid when kept inside a thermally insulated closed vessel at $2 5^{\circ} C$ was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters ?
1. A. $Δ U = 0, q < 0, w > 0$
2. B. $Δ U > 0, q = 0, w > 0$
3. C. $Δ U = 0, q = 0, w = 0$
4. D. $Δ U < 0, q = 0, w > 0$
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Answer: B