Other Chemistry · JEE Main previous year questions

2022 74 questions

1. Q712022 · 26 Jun 2022 · Shift 1

   Which statement is not true with respect to nitrate ion test?

   1. A.A dark brown ring is formed at the junction of two solutions.
   2. B.Ring is formed due to nitroferrous sulphate complex.
   3. C.The brown complex is $[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_5(\mathrm{NO})]{\mathrm{SO}}_4$.
   4. D.Heating the nitrate salt with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$, light brown fumes are evolved.
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   Answer: B

2. Q752022 · 26 Jun 2022 · Shift 1

   The correct order of melting point is :

   1. A.Be > Mg > Ca > Sr
   2. B.Sr > Ca > Mg > Be
   3. C.Be > Ca > Mg > Sr
   4. D.Be > Ca > Sr > Mg
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   Answer: D

3. Q782022 · 26 Jun 2022 · Shift 1

   Polar stratospheric clouds facilitate the formation of :

   1. A.${\mathrm{ClONO}}_2$
   2. B.$\mathrm{HOCl}$
   3. C.$\mathrm{ClO}$
   4. D.${\mathrm{CH}}_4$
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   Answer: B

4. Q802022 · 26 Jun 2022 · Shift 1

   A chemical which stimulates the secretion of pepsin is :

   1. A.Anti histamine
   2. B.Cimetidine
   3. C.Histamine
   4. D.Zantac
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   Answer: C

5. Q902022 · 26 Jun 2022 · Shift 1· Numerical answer

   2.0 g of ${\mathrm{H}}_2$ gas is adsorbed on 2.5 g of platinum powder at 300 K and 1 bar pressure. The volume of the gas adsorbed per gram of the adsorbent is ________ mL. (Given : $\mathrm{R}=0.083{\text{ L bar K}}^{-1}{\text{ mol}}^{-1}$)

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   Answer: 9960

6. Q632022 · 26 Jun 2022 · Shift 2

   Which of the following elements is considered as a metalloid?

   1. A.Sc
   2. B.Pb
   3. C.Bi
   4. D.Te
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   Answer: D

7. Q672022 · 26 Jun 2022 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: D

8. Q742022 · 26 Jun 2022 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: C

9. Q612022 · 25 Jun 2022 · Shift 1

   Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron? (A) $\mathrm{NO}$ (B) ${\mathrm{N}}_2$ (C) ${\mathrm{O}}_2$ (D) ${\mathrm{C}}_2$ (E) ${\mathrm{B}}_2$ Choose the most appropriate answer from the options given below :

   1. A.(A), (B), (C) only
   2. B.(B), (C), (E) only
   3. C.(A), (C) only
   4. D.(D) only
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   Answer: C

10. Q722022 · 25 Jun 2022 · Shift 1
    
    1. A.
    2. B.
    3. C.
    4. D.
    Show answer

    Answer: C

11. Q772022 · 25 Jun 2022 · Shift 1

    Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?

    1. A.${\mathrm{Be}}^{2+}$
    2. B.${\mathrm{Mg}}^{2+}$
    3. C.${\mathrm{Ca}}^{2+}$
    4. D.${\mathrm{Sr}}^{2+}$
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    Answer: D

12. Q802022 · 25 Jun 2022 · Shift 1

    Which one of the following is an example of artificial sweetner?

    1. A.Bithional
    2. B.Alitame
    3. C.Salvarsan
    4. D.Lactose
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    Answer: B

13. Q812022 · 25 Jun 2022 · Shift 1· Numerical answer

    The number of $\mathrm{N}$ atoms in $681\text{ g}$ of ${\mathrm{C}}_7{\mathrm{H}}_5{\mathrm{N}}_3{\mathrm{O}}_6$ is $x\times 10^{21}$. The value of $x$ is (${\mathrm{N}}_{\mathrm{A}}=6.02\times 10^{23}{\text{ mol}}^{-1}$) (Nearest Integer)

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    Answer: 5418

14. Q842022 · 25 Jun 2022 · Shift 1· Numerical answer

    $1\text{ L}$ aqueous solution of ${\mathrm{H}}_2{\mathrm{SO}}_4$ contains $0.02\text{ m mol }{\mathrm{H}}_2{\mathrm{SO}}_4$. $50\%$ of this solution is diluted with deionized water to give $1\text{ L}$ solution (A). In solution (A), $0.01\text{ m mol of }{\mathrm{H}}_2{\mathrm{SO}}_4$ are added. Total $\text{m mols of }{\mathrm{H}}_2{\mathrm{SO}}_4$ in the final solution is $\underline{}\times 10^3\text{ m mols}$.

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    Answer: 0

15. Q902022 · 25 Jun 2022 · Shift 1· Numerical answer

    The distance between ${\mathrm{Na}}^{+}$ and ${\mathrm{Cl}}^{-}$ ions in solid $\mathrm{NaCl}$ of density $43.1{\text{ g cm}}^{-3}$ is $\underline{}\times 10^{-10}\text{ m}$. (Nearest Integer) (Given : ${\mathrm{N}}_{\mathrm{A}}=6.02\times 10^{23}{\text{ mol}}^{-1}$)

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    Answer: 1

16. Q652022 · 25 Jun 2022 · Shift 2

    The correct order of electron gain enthalpies of Cl, F, Te and Po is

    1. A.F < Cl < Te < Po
    2. B.Po < Te < F < Cl
    3. C.Te < Po < Cl < F
    4. D.Cl < F < Te < Po
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    Answer: B

17. Q672022 · 25 Jun 2022 · Shift 2

    The correct order of reduction potentials of the following pairs is A. $\mathrm{C}{\mathrm{l}}_2/C{\mathrm{l}}^{-}$ B. ${\mathrm{I}}_2/{\mathrm{I}}^{-}$ C. $\mathrm{A}{\mathrm{g}}^{+}/Ag$ D. $\mathrm{N}{\mathrm{a}}^{+}/Na$ E. $\mathrm{L}{\mathrm{i}}^{+}/Li$ Choose the correct answer from the options given below.

    1. A.$\mathrm{A}>\mathrm{C}>\mathrm{B}>\mathrm{D}>\mathrm{E}$
    2. B.$\mathrm{A}>\mathrm{B}>\mathrm{C}>\mathrm{D}>\mathrm{E}$
    3. C.$\mathrm{A}>\mathrm{C}>\mathrm{B}>\mathrm{E}>\mathrm{D}$
    4. D.$\mathrm{A}>\mathrm{B}>\mathrm{C}>\mathrm{E}>\mathrm{D}$
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    Answer: A

18. Q722022 · 25 Jun 2022 · Shift 2
    
    1. A.benzyl bromide
    2. B.bromobenzene
    3. C.cyclohexyl bromide
    4. D.methyl bromide
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    Answer: B

19. Q762022 · 25 Jun 2022 · Shift 2

    Match List I with List II $$\begin{array}{llll}& \text{List - I}& & \text{List -II}\\ \text{A.}& \text{Zymase}& \text{I.}& \text{Stomach}\\ \text{B.}& \text{Diastase}& \text{II.}& \text{Yeast}\\ \text{C.}& \text{Urease}& \text{III.}& \text{Malt}\\ \text{D.}& \text{Pepsin}& \text{IV.}& \text{Soyabean}\end{array}$$ Choose the correct answer from the options given below :

    1. A.A-II, B-III, C-I, D-IV
    2. B.A-II, B-III, C-IV, D-I
    3. C.A-III, B-II, C-IV, D-I
    4. D.A-III, B-II, C-I, D-IV
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    Answer: B

20. Q662022 · 24 Jun 2022 · Shift 2

    Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be :

    1. A.Hg
    2. B.Ag
    3. C.Ga
    4. D.Cs
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    Answer: B

21. Q752022 · 24 Jun 2022 · Shift 2

    Which of the following chemical reactions represents Hall-Heroult Process?

    1. A.${\mathrm{Cr}}_2{\mathrm{O}}_3+2\mathrm{Al}\to {\mathrm{Al}}_2{\mathrm{O}}_3+2\mathrm{Cr}$
    2. B.$2{\mathrm{Al}}_2{\mathrm{O}}_3+3\mathrm{C}\to 4\mathrm{Al}+3{\mathrm{CO}}_2$
    3. C.$\mathrm{FeO}+\mathrm{CO}\to \mathrm{Fe}+{\mathrm{CO}}_2$
    4. D.$2[\mathrm{Au}(\mathrm{CN}{)}_2{]}_{(aq)}^{-}+\mathrm{Zn}(s)\to 2\mathrm{Au}(s)+[\mathrm{Zn}(\mathrm{CN}{)}_4{]}^{2-}$
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    Answer: B

22. Q762022 · 24 Jun 2022 · Shift 2

    In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?

    1. A.$\mathrm{NaOH}$
    2. B.$\mathrm{NaCl}$
    3. C.$\mathrm{Na}\text{ metal}$
    4. D.${\mathrm{Na}}_2{\mathrm{CO}}_3$
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    Answer: A

23. Q772022 · 24 Jun 2022 · Shift 2

    Which one of the following compounds is used as a chemical in certain type of fire extinguishers?

    1. A.Baking soda
    2. B.Soda ash
    3. C.Washing soda
    4. D.Caustic soda
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    Answer: A

24. Q882022 · 24 Jun 2022 · Shift 2· Numerical answer

    At $300\text{ K}$, a sample of $3.0\text{ g}$ of gas A occupies the same volume as $0.2\text{ g}$ of hydrogen at $200\text{ K}$ at the same pressure. The molar mass of gas A is $\underline{}{\text{ g mol}}^{-1}$. (nearest integer) Assume that the behaviour of gases as ideal. (Given : The molar mass of hydrogen (${\mathrm{H}}_2$) gas is $2.0{\text{ g mol}}^{-1}$.)

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    Answer: 45