Sample paper · JEE Preparation Chemistry

Chemistry · Sample Paper 2

JEE Main pattern — 20 fresh MCQs and 5 numerical-answer questions on the full Class 11 + 12 Chemistry syllabus, 4 marks each.

25 questions · 100 marks · 60 minutes

Timed, marked on submit · free with an account

General instructions

This paper has 25 questions in two sections. All are compulsory.
Section A — Q1 to Q20: multiple-choice questions with one correct answer.
Section B — Q21 to Q25: numerical-value questions. Type the answer as a number (round to the nearest integer unless stated).
Each correct answer earns 4 marks. In the real JEE Main a wrong answer costs 1 mark; this practice paper does not deduct marks.
Time: 60 minutes — the share of Chemistry in the 3-hour JEE Main paper.

Section A · Multiple choice

Questions 1–20, 4 marks each.

Question 14 marks
The molality of a 2 M aqueous solution of NaOH with density $1.08 g mL^{- 1}$ is about
1. A.1.85 m
2. B.2.0 m
3. C.2.2 m
4. D.1.0 m
Question 24 marks
The ratio of the energy of an electron in the second orbit of $H e^{+}$ to that in the first orbit of H is
1. A.1
2. B.2
3. C.4
4. D.1/2
Question 34 marks
The correct order of ionic radii is
1. A. $N a^{+} > M g^{2 +} > A l^{3 +}$
2. B. $A l^{3 +} > M g^{2 +} > N a^{+}$
3. C. $M g^{2 +} > N a^{+} > A l^{3 +}$
4. D. $N a^{+} = M g^{2 +} = A l^{3 +}$
Question 44 marks
Which molecule has the largest bond angle?
1. A. $H_{2} O$
2. B. $N H_{3}$
3. C. $C H_{4}$
4. D. $B F_{3}$
Question 54 marks
Which species is diamagnetic?
1. A. $O_{2}$
2. B. $O_{2}^{-}$
3. C. $N_{2}$
4. D. $B_{2}$
Question 64 marks
For an ideal gas in a free (Joule) expansion into vacuum,
1. A.w = 0, q = 0, ΔU = 0
2. B.w > 0, ΔU > 0
3. C.q > 0, ΔU = 0
4. D.w < 0, q = 0
Question 74 marks
The solubility of $C a F_{2}$ is s mol L $^{- 1}$ . Its $K_{s p}$ is
1. A. $s^{2}$
2. B. $2 s^{3}$
3. C. $4 s^{3}$
4. D. $27 s^{4}$
Question 84 marks
In the reaction $3 C l_{2} + 6 O H^{-} \to 5 C l^{-} + C l O_{3}^{-} + 3 H_{2} O$ , the change in oxidation state of the chlorine that is oxidised is
1. A.0 to −1
2. B.0 to +5
3. C.0 to +3
4. D.+1 to +5
Question 94 marks
The correct order of stability of carbanions is
1. A. $C H_{3}^{-} > 1^{\circ} > 2^{\circ} > 3^{\circ}$
2. B. $3^{\circ} > 2^{\circ} > 1^{\circ} > C H_{3}^{-}$
3. C. $2^{\circ} > 1^{\circ} > 3^{\circ}$
4. D.all equal
Question 104 marks
Benzene reacts with $C H_{3} C l$ in the presence of anhydrous $A l C l_{3}$ to give
1. A.chlorobenzene
2. B.toluene
3. C.benzyl chloride
4. D.xylene only
Question 114 marks
A solution of benzene and toluene obeys Raoult's law. Which of these is true?
1. A. $Δ H_{mi x} > 0$
2. B. $Δ V_{mi x} = 0$
3. C. $Δ H_{mi x} < 0$
4. D. $Δ S_{mi x} = 0$
Question 124 marks
Which metal is obtained at the cathode when molten NaCl is electrolysed?
1. A. $H_{2}$
2. B.Na
3. C. $C l_{2}$
4. D.NaOH
Question 134 marks
For the reaction $2 N_{2} O_{5} \to 4 N O_{2} + O_{2}$ , if the rate of disappearance of $N_{2} O_{5}$ is $0.02 mol L^{- 1} s^{- 1}$ , the rate of formation of $N O_{2}$ is
1. A.0.01
2. B.0.02
3. C.0.04
4. D.0.08
Question 144 marks
Which is the strongest oxidising agent?
1. A. $F_{2}$
2. B. $C l_{2}$
3. C. $B r_{2}$
4. D. $I_{2}$
Question 154 marks
The spin-only magnetic moment of $M n^{2 +}$ (Z = 25) is about
1. A.3.87 BM
2. B.4.90 BM
3. C.5.92 BM
4. D.1.73 BM
Question 164 marks
Which complex is expected to be colourless?
1. A. $[T i (H_{2} O)_{6}]^{3 +}$
2. B. $[C u (N H_{3})_{4}]^{2 +}$
3. C. $[S c (H_{2} O)_{6}]^{3 +}$
4. D. $[N i (H_{2} O)_{6}]^{2 +}$
Question 174 marks
2-Bromobutane reacts with alcoholic KOH to give mainly
1. A.but-1-ene
2. B.but-2-ene
3. C.butan-2-ol
4. D.butane
Question 184 marks
The reaction of ethoxyethane with excess HI on heating gives
1. A.ethanol and ethyl iodide
2. B.two molecules of ethyl iodide
3. C.ethene
4. D.acetaldehyde
Question 194 marks
Which reagent converts an aldehyde into a primary alcohol?
1. A. $N a B H_{4}$
2. B. $K M n O_{4}$
3. C. $K_{2} C r_{2} O_{7}$
4. D.Tollens' reagent
Question 204 marks
Which vitamin is water-soluble?
1. A.A
2. B.D
3. C.C
4. D.K

Section B · Numerical value

Questions 21–25, 4 marks each. Enter a number.

Question 214 marks
How many grams of $H_{2} O$ are formed when 4 g of $H_{2}$ reacts completely with excess oxygen?
Question 224 marks
Find the total number of orbitals in the shell with principal quantum number n = 4.
Question 234 marks
A first-order reaction has a rate constant of $0.0693 min^{- 1}$ . Find the time (in minutes) for the concentration to fall to one-eighth.
Question 244 marks
Find the coordination number of the central metal in $[C o (e n)_{3}]^{3 +}$ .
Question 254 marks
Find the pH of a $1 0^{- 4}$ M solution of NaOH at 298 K.

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