Hydrogen & s-Block · JEE Main previous year questions

2023 29 questions

1. Q672023 · 11 Apr 2023 · Shift 1

   $25\text{ mL}$ of silver nitrate solution ($1\text{M}$) is added dropwise to $25\text{ mL}$ of potassium iodide ($1.05\text{M}$) solution. The ion(s) present in very small quantity in the solution is/are :

   1. A.${\mathrm{I}}^{-}$ only
   2. B.${\mathrm{K}}^{+}$ only
   3. C.$\mathrm{A}{\mathrm{g}}^{+}$ and ${\mathrm{I}}^{-}$ both
   4. D.$\mathrm{N}{\mathrm{O}}_3^{-}$ only
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   Answer: C

2. Q802023 · 11 Apr 2023 · Shift 1

   Match List-I with List-II: | List - I | | List - II | | :--- | :--- | :--- | | A. $\mathrm{K}$ | I. | Thermonuclear reactions | | B. $\mathrm{KCl}$ | II. | Fertilizer | | C. $\mathrm{KOH}$ | III. | Sodium potassium pump | | D. $\mathrm{Li}$ | IV. | Absorbent of $\mathrm{C}{\mathrm{O}}_2$ | Choose the correct answer from the options given below :

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

3. Q742023 · 11 Apr 2023 · Shift 2

   Alkali metal from the following with least melting point is :

   1. A.$\mathrm{Rb}$
   2. B.$\mathrm{Na}$
   3. C.$\mathrm{K}$
   4. D.$\mathrm{Cs}$
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   Answer: D

4. Q782023 · 11 Apr 2023 · Shift 2

   Which hydride among the following is less stable?

   1. A.$\mathrm{N}{\mathrm{H}}_3$
   2. B.$\mathrm{HF}$
   3. C.$\mathrm{LiH}$
   4. D.$\mathrm{Be}{\mathrm{H}}_2$
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   Answer: D

5. Q882023 · 11 Apr 2023 · Shift 2· Numerical answer

   The volume of hydrogen liberated at STP by treating $2.4\text{ g}$ of magnesium with excess of hydrochloric acid is _________ $\times 10^{-2}\text{ L}$ Given : Molar volume of gas is $22.4\text{ L}$ at STP. Molar mass of magnesium is $24{\text{ g mol}}^{-1}$

   Show answer

   Answer: 224

6. Q792023 · 10 Apr 2023 · Shift 1

   Match List I with List II $$\begin{array}{llll}& \text{List I Industry}& & \text{List II Waste Generated}\\ \text{(A)}& \text{Steel plants}& \text{(I)}& \text{Gypsum}\\ \text{(B)}& \text{Thermal power plants}& \text{(II)}& \text{Fly ash}\\ \text{(C)}& \text{Fertilizer industries}& \text{(III)}& \text{Slag}\\ \text{(D)}& \text{Paper mills}& \text{(IV)}& \text{Bio-degradable wastes}\end{array}$$ Choose the correct answer from the options given below :

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

7. Q622023 · 10 Apr 2023 · Shift 2
   
   1. A.A, C, D, B
   2. B.C, A, B, D
   3. C.A, C, B, D
   4. D.C, A, D, B
   Show answer

   Answer: B

8. Q782023 · 10 Apr 2023 · Shift 2

   Number of water molecules in washing soda and soda ash respectively are :

   1. A.1 and 0
   2. B.10 and 1
   3. C.1 and 10
   4. D.10 and 0
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   Answer: D

9. Q742023 · 8 Apr 2023 · Shift 1
   
   1. A.A-IV, B-I, C-II, D-III
   2. B.A-III, B-IV, C-I, D-II
   3. C.A-III, B-IV, C-II, D-I
   4. D.A-II, B-IV, C-III, D-I
   Show answer

   Answer: C

10. Q772023 · 8 Apr 2023 · Shift 1

    Given below are two statements: Statement I : Lithium and Magnesium do not form superoxide Statement II : The ionic radius of $\mathrm{L}{\mathrm{i}}^{+}$ is larger than ionic radius of $\mathrm{M}{\mathrm{g}}^{2+}$ 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 incorrect
    3. C.Both Statement I and Statement II are correct
    4. D.Statement I is correct but Statement II is incorrect
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    Answer: C

11. Q782023 · 8 Apr 2023 · Shift 1

    What is the purpose of adding gypsum to cement?

    1. A.To facilitate the hydration of cement
    2. B.To speed up the process of setting
    3. C.To give a hard mass
    4. D.To slow down the process of setting
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    Answer: D

12. Q732023 · 8 Apr 2023 · Shift 2

    Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Sodium is about 30 times as abundant as potassium in the oceans. Reason R : Potassium is bigger in size than sodium. In the light of the above statements, choose the correct answer from the options given below

    1. A.Both A and R are true but R is NOT the correct explanation of A
    2. B.A is false but R is true
    3. C.Both A and R are true and R is the correct explanation of A
    4. D.A is true but R is false
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    Answer: C

13. Q792023 · 8 Apr 2023 · Shift 2

    For a good quality cement, the ratio of lime to the total of the oxides of $\mathrm{Si},\mathrm{Al}$ and $\mathrm{Fe}$ should be as close as possible to :

    1. A.3
    2. B.2
    3. C.1
    4. D.4
    Show answer

    Answer: B

14. Q762023 · 6 Apr 2023 · Shift 1

    The setting time of Cement is increased by adding :

    1. A.Gypsum
    2. B.Limestone
    3. C.Clay
    4. D.Silica
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    Answer: A

15. Q732023 · 1 Feb 2023 · Shift 1

    Match List I with List II : | List I | List II | | :--- | :--- | | A. Slaked lime | I. $\text{NaOH}$ | | B. Dead burnt plaster | II. $\text{Ca}(\text{OH}{)}_2$ | | C. Caustic soda | III. ${\text{Na}}_2{\text{CO}}_3\cdot 10{\text{H}}_2\text{O}$ | | D. Washing soda | IV. ${\text{CaSO}}_4$ | Choose the correct answer from the options given below :

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

16. Q782023 · 1 Feb 2023 · Shift 1

    Choose the correct statement(s) : A. Beryllium oxide is purely acidic in nature. B. Beryllium carbonate is kept in the atmosphere of ${\text{CO}}_2$. C. Beryllium sulphate is readily soluble in water. D. Beryllium shows anomalous behaviour. Choose the correct answer from the options given below :

    1. A.A only
    2. B.B, C and D only
    3. C.A, B and C only
    4. D.A and B only
    Show answer

    Answer: B

17. Q612023 · 31 Jan 2023 · Shift 1

    When ${\mathrm{Cu}}^{2+}$ ion is treated with $\mathrm{KI}$, a white precipitate, X appears in solution. The solution is titrated with sodium thiosulphate, the compound Y is formed. X and Y respectively are :

    1. A.$\mathrm{X}={\mathrm{CuI}}_2\mathrm{Y}={\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_6$
    2. B.$\mathrm{X}={\mathrm{Cu}}_2{\mathrm{I}}_2\mathrm{Y}={\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_6$
    3. C.$\mathrm{X}={\mathrm{CuI}}_2\mathrm{Y}={\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$
    4. D.$\mathrm{X}={\mathrm{Cu}}_2{\mathrm{I}}_2\mathrm{Y}={\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_5$
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    Answer: B

18. Q672023 · 30 Jan 2023 · Shift 1
    
    1. A.
    2. B.
    3. C.
    4. D.
    Show answer

    Answer: A

19. Q792023 · 30 Jan 2023 · Shift 1

    Lithium aluminium hydride can be prepared from the reaction of :

    1. A.$\mathrm{LiCl}$ and ${\mathrm{Al}}_2{\mathrm{H}}_6$
    2. B.$\mathrm{LiH}$ and $\mathrm{Al}(\mathrm{OH}{)}_3$
    3. C.$\mathrm{LiH}$ and ${\mathrm{Al}}_2{\mathrm{Cl}}_6$
    4. D.$\mathrm{LiCl}$, $\mathrm{Al}$ and ${\mathrm{H}}_2$
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    Answer: C

20. Q802023 · 30 Jan 2023 · Shift 1

    The alkaline earth metal sulphate(s) which are readily soluble in water is/are : A. ${\mathrm{BeSO}}_4$ B. ${\mathrm{MgSO}}_4$ C. ${\mathrm{CaSO}}_4$ D. ${\mathrm{SrSO}}_4$ E. ${\mathrm{BaSO}}_4$ Choose the correct answer from the options given below :

    1. A.A and B
    2. B.B and C
    3. C.B only
    4. D.A only
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    Answer: A

21. Q812023 · 29 Jan 2023 · Shift 2· Numerical answer

    The volume of $\mathrm{HCl}$, containing $73\mathrm{g}{\mathrm{L}}^{-1}$, required to completely neutralise $\mathrm{NaOH}$ obtained by reacting $0.69\mathrm{g}$ of metallic sodium with water, is ____ $\mathrm{mL}$. (Nearest Integer) (Given : molar masses of $\mathrm{Na},\mathrm{Cl},\mathrm{O},\mathrm{H}$, are $23,35.5,16$ and $1\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ respectively.)

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    Answer: 15

22. Q682023 · 25 Jan 2023 · Shift 1

    '25 volume' hydrogen peroxide means

    1. A.1 L marketed solution contains 75 g of ${\mathrm{H}}_2{\mathrm{O}}_2$.
    2. B.1 L marketed solution contains 250 g of ${\mathrm{H}}_2{\mathrm{O}}_2$.
    3. C.1 L marketed solution contains 25 g of ${\mathrm{H}}_2{\mathrm{O}}_2$.
    4. D.100 mL marketed solution contains 25 g of ${\mathrm{H}}_2{\mathrm{O}}_2$.
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    Answer: A

23. Q792023 · 25 Jan 2023 · Shift 1

    Compound A reacts with $\mathrm{N}{\mathrm{H}}_4\mathrm{Cl}$ and forms a compound B. Compound B reacts with ${\mathrm{H}}_2\mathrm{O}$ and excess of $\mathrm{C}{\mathrm{O}}_2$ to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A, B and C, are respectively :

    1. A.$\mathrm{Ca}(\mathrm{OH}{)}_2,\mathrm{N}{\mathrm{H}}_4^{\oplus },(\mathrm{N}{\mathrm{H}}_4{)}_2\mathrm{C}{\mathrm{O}}_3$
    2. B.$\mathrm{CaC}{\mathrm{l}}_2,\mathrm{N}{\mathrm{H}}_4^{\oplus },(\mathrm{N}{\mathrm{H}}_4{)}_2\mathrm{C}{\mathrm{O}}_3$
    3. C.$\mathrm{CaC}{\mathrm{l}}_2,\mathrm{N}{\mathrm{H}}_3,\mathrm{N}{\mathrm{H}}_4\mathrm{HC}{\mathrm{O}}_3$
    4. D.$\mathrm{Ca}(\mathrm{OH}{)}_2,\mathrm{N}{\mathrm{H}}_3,\mathrm{N}{\mathrm{H}}_4\mathrm{HC}{\mathrm{O}}_3$
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    Answer: D

24. Q772023 · 24 Jan 2023 · Shift 2

    Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Beryllium has less negative value of reduction potential compared to the other alkaline earth metals. Reason R : Beryllium has large hydration energy due to small size of $\mathrm{B}{\mathrm{e}}^{2+}$ but relatively large value of atomization enthalpy In the light of the above statements, choose the most appropriate answer from the options given below :

    1. A.Both A and R are correct but R is NOT the correct explanation of A
    2. B.Both A and R are correct and R is the correct explanation of A
    3. C.A is correct but R is not correct
    4. D.A is not correct but R is correct
    Show answer

    Answer: B

25. Q792023 · 24 Jan 2023 · Shift 2

    Identify the correct statements about alkali metals. A. The order of standard reduction potential $({\mathrm{M}}^{+}\mid \mathrm{M})$ for alkali metal ions is $\mathrm{Na}>\mathrm{Rb}>\mathrm{Li}$. B. CsI is highly soluble in water. C. Lithium carbonate is highly stable to heat. D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic. E. All the alkali metal hydrides are ionic solids. Choose the correct answer from the options given below :

    1. A.C and E only
    2. B.A and E only
    3. C.A, B, D only
    4. D.A, B and E only
    Show answer

    Answer: B