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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2002 25 questions

Q1492002 · 27 Apr 2002 · Shift 1
With increase of temperature, which of these changes?
1. A.molality
2. B.weight fraction of solute
3. C.molarity
4. D.mole fraction
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Answer: C
Q1502002 · 27 Apr 2002 · Shift 1
Number of atoms in 558.5 gram Fe (at. wt. of Fe = 55.85 $g mo l^{- 1}$ ) is
1. A.twice that in 60 g carbon
2. B. $6.023 \times 1 0^{22}$
3. C.half that in 8 g He
4. D. $558.5 \times 6.023 \times 1 0^{23}$
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Answer: A
Q1512002 · 27 Apr 2002 · Shift 1
In a hydrogen atom, if energy of an electron in ground state is -13.6 eV, then that in the 2 $^{n d}$ excited state is
1. A.-1.51 eV
2. B.-3.4 eV
3. C.-6.04 eV
4. D.-13.6 eV
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Answer: A
Q1542002 · 27 Apr 2002 · Shift 1
Which of the following are arranged in an increasing order of their bond strengths?
1. A. $O_{2}^{-} < O_{2} < O_{2}^{+} < O_{2}^{2 -}$
2. B. $O_{2}^{2 -} < O_{2}^{-} < O_{2} < O_{2}^{+}$
3. C. $O_{2}^{-} < O_{2}^{2 -} < O_{2} < O_{2}^{+}$
4. D. $O_{2}^{+} < O_{2} < O_{2}^{-} < O_{2}^{2 -}$
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Answer: B
Q1582002 · 27 Apr 2002 · Shift 1
For the reactions $C + O_{2} \to C O_{2}$ ; $Δ H$ = -393 J $2Zn + O_{2} \to 2ZnO$ ; $Δ H$ = -412 J
1. A.carbon can oxidise Zn
2. B.oxidation of carbon is not feasible
3. C.oxidation of Zn is not feasible
4. D.Zn can oxidise carbon
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Answer: D
Q1602002 · 27 Apr 2002 · Shift 1
1 M NaCl and 1 M HCl are present in an aqueous solution. The solution is
1. A.not a buffer solution with pH < 7
2. B.not a buffer solution with pH > 7
3. C.a buffer solution with pH < 7
4. D.a buffer solution with pH > 7
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Answer: A
Q1632002 · 27 Apr 2002 · Shift 1
Change in volume of the system does not alter which of the following equilibria?
1. A. $N_{2} (g) + O_{2} (g) ⇋ 2NO (g)$
2. B. $PC l_{5} (g) ⇋ PC l_{3} (g) + C l_{2} (g)$
3. C. $N_{2} (g) + 3 H_{2} (g) ⇋ 2N H_{3} (g)$
4. D. $S O_{2} C l_{2} (g) ⇋ S O_{2} (g) + C l_{2} (g)$
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Answer: A
Q1702002 · 27 Apr 2002 · Shift 1
Racemic mixture is formed by mixing two
1. A.isomeric compounds
2. B.enantiomers with chiral compounds
3. C.meso compounds
4. D.optical isomers
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Answer: B
Q1712002 · 27 Apr 2002 · Shift 1
The reaction : $(C H_{3})_{3} C - Br H_{2} O (C H_{3})_{3} C - OH$
1. A.elimination reaction
2. B.substitution reaction
3. C.free radical reaction
4. D.displacement reaction
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Answer: B
Q1752002 · 27 Apr 2002 · Shift 1
In a mixture of A and B, components show negative deviation when :
1. A. $Δ V_{mi x} > 0, Δ S_{mi x} > 0$
2. B. $Δ V_{mi x} = 0, Δ S_{mi x} > 0$
3. C.A - B interaction is weaker than A - A and B - B interaction
4. D.A - B interaction is stronger than A - A and B - B interaction
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Answer: D
Q1772002 · 27 Apr 2002 · Shift 1
EMF of a cell in terms of reduction potential of its left and right electrodes is :
1. A. $E = E_{l e f t} - E_{r i g h t}$
2. B. $E = E_{l e f t} + E_{r i g h t}$
3. C. $E = E_{r i g h t} - E_{l e f t}$
4. D. $E = - (E_{r i g h t} + E_{l e f t})$
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Answer: C
Q1782002 · 27 Apr 2002 · Shift 1
For the following cell with hydrogen electrodes at two different pressures $p_{1}$ and $p_{2}$ . What will be the emf for the given cell : $p_{1} Pt (H_{2}) ∣ 1 M H^{+} (aq) ∣ p_{2} Pt (H_{2})$
1. A. $\frac{R T}{F} lo g_{e} \frac{P _{1}}{P _{2}}$
2. B. $\frac{R T}{2 F} lo g_{e} \frac{P _{1}}{P _{2}}$
3. C. $\frac{R T}{F} lo g_{e} \frac{P _{2}}{P _{1}}$
4. D.none of these
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Answer: B
Q1862002 · 27 Apr 2002 · Shift 1
The integrated rate equation is $R t = lo g C_{0} - lo g C_{t}$ . The straight line graph is obtained by plotting
1. A.time vs $lo g C_{t}$
2. B. $\frac{1}{t im e}$ vs $C_{t}$
3. C.time vs $C_{t}$
4. D. $\frac{1}{t im e}$ vs $\frac{1}{C _{t}}$
Show answer
Answer: A
Q1872002 · 27 Apr 2002 · Shift 1
$β$ - particle is emitted in radioactivity by
1. A.conversion of proton to neutron
2. B.from outermost orbit
3. C.conversion of neutron to proton
4. D. $β$ -particle is not emitted
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Answer: C
Q1882002 · 27 Apr 2002 · Shift 1
Which of the following statements is true?
1. A.HF is less polar than HBr
2. B.absolutely pure water does not contain any ions
3. C.chemical bond formation takes place when forces of attraction overcome the forces of repulsion
4. D.in covalency transference of electron takes place
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Answer: C
Q1942002 · 27 Apr 2002 · Shift 1
$C H_{3}$ - Mg - Br is an organometallic compound due to :
1. A.Mg - Br bond
2. B.C - Mg bond
3. C.C - Br bond
4. D.C - H bond
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Answer: B
Q1952002 · 27 Apr 2002 · Shift 1
The most stable ion is :
1. A. $[Fe (OH)_{3}]^{3 -}$
2. B. $[Fe (Cl)_{6}]^{3 -}$
3. C. $[Fe (CN)_{6}]^{3 -}$
4. D. $[Fe (H_{2} O)_{6}]^{3 +}$
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Answer: C
Q1962002 · 27 Apr 2002 · Shift 1
$C H_{3} C H_{2} COOH C l_{2} red P A Alc. KOH B$ What is B?
1. A. $C H_{3} C H_{2} COCl$
2. B. $C H_{3} C H_{2} CHO$
3. C. $C H_{2} = CHCOOH$
4. D. $ClC H_{2} C H_{2} COOH$
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Answer: C
Q1992002 · 27 Apr 2002 · Shift 1
How do we differentiate between $F e^{3 +}$ and $C r^{3 +}$ in group III?
1. A.by taking excess of $N H_{4} OH$ solution
2. B.by increasing $N H_{4}^{+}$ ion concentration
3. C.by decreasing $O H^{-}$ ion concentration
4. D.both (b) and (c)
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Answer: B
Q2042002 · 27 Apr 2002 · Shift 1
On vigorous oxidation by permanaganate solution. $(C H_{3})_{2} C = CH - C H_{2} - CHO$ gives
1. A. $(C H_{3})_{2} CO$ and $OHC - C H_{2} - CHO$
2. B. $(C H_{3})_{2} C (OH) - CH (OH) - C H_{2} CHO$
3. C. $(C H_{3})_{2} CO$ and $OHC - C H_{2} - COOH$
4. D. $(C H_{3})_{2} CO$ and $C H_{2} (COOH)_{2}$
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Answer: D
Q2112002 · 27 Apr 2002 · Shift 1
Kinetic theory of gases proves
1. A.only Boyle's law
2. B.only Charle's law
3. C.only Avogadro's law
4. D.All of these
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Answer: D
Q2142002 · 27 Apr 2002 · Shift 1
A metal M readily forms its sulphate $MS O_{4}$ , which is water-soluble. It forms its oxide MO which becomes inert on heating. It forms an insoluble hydroxide $M (OH)_{2}$ which is soluble in NaOH solution. The M is :
1. A.Mg
2. B.Ba
3. C.Ca
4. D.Be
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Answer: D
Q2192002 · 27 Apr 2002 · Shift 1
Alum helps in purifying water by :
1. A.forming Si complex with clay particles
2. B.sulphate part which combines with the dirt and removes it
3. C.coagulating the mud particles
4. D.making mud water soluble
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Answer: C
Q2242002 · 27 Apr 2002 · Shift 1
When $H_{2} S$ is passed through $H g_{2} S$ we get :
1. A.HgS
2. B. $HgS + H g_{2} S$
3. C. $H g_{2} S$
4. D. $H g_{2} S_{2}$
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Answer: B
Q2252002 · 27 Apr 2002 · Shift 1
1. A.antiseptic
2. B.antibiotic
3. C.analgesic
4. D.pesticide
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Answer: C