JEE MAIN Chemistry Question

JEE Main 2020 Chemistry Question Paper || JEE Main 2020 Chemistrys question paper

Section A

1. The increasing order of the following compounds towards HCN addition is :

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(1) iii < i < iv < ii
(2) i < iii < iv < ii
(3) iii < iv < ii < i
(4) iii < iv < i < ii

(1) iii < i < iv < ii

2. Which of the following is used for the preparation of colloids?

(1) Ostwald process
(2) Van Arkel Method
(3) Mond process
(4) Bredig’s Arc method

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(4) Bredig’s Arc method

3. An open beaker of water in equilibrium with water vapour is in sealed container. When a few grams of glucose are added to the beaker of water, the rate at which water molecules:

(1) Leaves the vapour decreases
(2) Leaves the solution decreases
(3) Leaves the vapour increases
(4) Leaves the solution increases

(3) Leaves the vapour increases 

4. For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements :

(i) Both the complexes can be high spin
(ii) Ni(II) complex can very rarely below spin
(iii) With strong field Ligands, Mn(II) complexes can be low spin.
(iv) Aqueous solution of Mn (II) ions is yellow in colour.
The correct statements are

(1) (i) and (ii) only
(2) (i), (ii) and (iii) only
(3) (i), (iii) and (iv) only
(4) (ii), (iii) and (iv) only

(2) (i), (ii) and (iii) only

5. The statement that is not true about ozone is :

(1) in the stratosphere, CFCs release chlorine free radicals (CI) which reacts with O₃ to give chlorine dioxide radicals.
(2) in the stratosphere, it forms as protective shield against UV radiation.
(3) it is a toxic gas and its reaction with NO gives NO₂
(4) in the atmosphere, it is depleted by CFCs.

(1) in the stratosphere, CFCs release chlorine free radicals (CI) which reacts with O₃ to give chlorine dioxide radicals.

6. Consider the following reactions :

‘x’, ‘y’, and ‘z’ in these reactions are respectively:

(1) 5,6, and 6
(2) 4, 5 and 5
(3) 4,6 and 5
(4) 5,4 and 5

(3) 4,6 and 5

7. The IUPAC name for the following compound is :

(1) 2,5-dimethyl-6-carboxy-hex-3-enal
(2) 2,5-dimethyl-5-carboxy-hex-3-enal
(3) 6-formyl-2-methyl-hex-3-enoic acid
(4) 2,5 dimethyl-6-oxo-hex-3-enoic acid

(4) 2,5 dimethyl-6-oxo-hex-3-enoic acid

8. For the following Assertion and Reason, the correct option is
Assertion (A) : When Cu (II) and sulphide ions are mixed they react together extremely quickly to give a solid.
Reason (R) : The equilibrium constant of Cu²+ (aq) + S²- (aq) = CuS(s) is high because the solubility product is low.

(1) (A) is false and (R) is true.
(2) Both (A) and (R) are false.
(3) Both (A) and (R) are true but (R) is not explanation for (A).
(4) Both (A) and (R) are true and (R) is the explanation for (A).

  (3) Both (A) and (R) are true but (R) is not explanation for (A).

9. Which of the following graphs is not correct
for ideal gas ?

[d = density, P = pressure, T = Temperature]


10. While titration dilute HCl solution with aqueous NaOH, which of the following will not be required ?

(1) Clamp and Phenolphthalein
(2) Burette and Porcelain tile
(3) Bunsen burner and measuring cylinder
(4) Pipette and distilled water

(3) Bunsen burner and measuring cylinder

11. In carius method of estimation of halogen 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structure of the compound?


12. On heating compound (A) gives a gas (B) which is constituent of air. The gas when treated with H₂ in the presence of catalyst gives another gas (C) which is basic in nature, (A) should not be:

(1) (NH₄)₂Cr₂O₇
(2) NH₄NO₂
(3) Pb(NO₃)₂
(4) NaN₃

  (3) Pb(NO₃)₂

13. The major product in the following reaction is:


14. In general, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is:

(1) Electronegativity
(2) Electron gain enthalpy
(3) Ionization enthalpy
(4) Atomic radius

(4) Atomic radius

15. The figure that is not a direct manifestation of the quantum nature of atom is


16. The major aromatic product C in the following reaction sequence will be :


17. Consider that d⁶ metal ion (M²+) forms a complex with aqua ligands and the spin only magnetic moment of the complex is 4.90 BM. The geometry and the crystal field stabilization energy of the complex is :

(1) Tetrahedral and -1.6Δt + 1P
(2) Octahedral and -2.4Δo + 2P
(3) Tetrahedral and – 0.6Δt
(4) Octahedral and -1.6Δo

  (3) Tetrahedral and – 0.6Δt

18. If AB₄ molecule is a polar molecule, a possible geometry of AB₄ is :

(1) Square pyramidal
(2) Rectangular planar
(3) Square planar
(4) Tetrahedral

(1) Square pyramidal

19. Which of the following compounds will show retention in configuration on nucleophile substitution by OH- ion ?


20.the metal mainly used in devising photoelectric cells is.

(1) Li
(2) Rb
(3) Cs
(4) Na

(3) Cs

Section B

21. The mass of gas adsorbed, x per unit mass of adsorbed, m was measured at various pressures p. A graph between log x/m and log p gives a straight line with slope equal to 2 and the intercept equal to 0.4771. The value of x/m at a pressure of 4 atm is :
Given logm 3 = 0.4771


22. the gibb’s energy change (in J)for the given reaction at[cu²+] =[sn²+] = 1 m and 298k is :
Cu(s) + Sn²+ (aq) → Cu²+ (aq) + Sn(g)

[Eosn2+/sn = -0.16V, E°Cu²+/cu = 0.34V
Take F = 96500 C mol¹]


23. The internal energy ( in J) when 90 g of water under goes complete evaporation at 100°C is ………

(Given ΔHvap for water at 373 K = 41 kJ/mol R = 8.314 JK¹ mol¹)


24. The oxidation states of iron atoms in compounds(A), (B) and (C), respectively are x, y, z. The sum of x, y, z is…….

(A) Na₄[Fe(CN)₅(NOS)]
(B) Na₄[FeO₄]
(C) [Fe₂(CO)₉]


25. The number of chiral carbons present in the molecule given below is…….


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