Hydrogen & s-Block · JEE Main previous year questions

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2023 29 questions

Q802023 · 13 Apr 2023 · Shift 1
Given below are two statements : Statement I : Permutit process is more efficient compared to the synthetic resin method for the softening of water. Statement II : Synthetic resin method results in the formation of soluble sodium salts. In the light of the above statements, choose the most appropriate answer from the options given below:
1. A.Statement I is correct but Statement II is incorrect
2. B.Both the Statements I and II are correct
3. C.Both the Statements I and II are incorrect
4. D.Statement I is incorrect but Statement II is correct
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Answer: C
Q852023 · 13 Apr 2023 · Shift 1· Numerical answer
$20 mL$ of calcium hydroxide was consumed when it was reacted with $10 mL$ of unknown solution of $H_{2} SO_{4}$ . Also $20 mL$ standard solution of $0.5 M$ $HCl$ containing 2 drops of phenolphthalein was titrated with calcium hydroxide, the mixture showed pink colour when burette displayed the value of $35.5 mL$ whereas the burette showed $25.5 mL$ initially. The concentration of $H_{2} SO_{4}$ is ___________ M. (Nearest integer)
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Answer: 1
Q742023 · 12 Apr 2023 · Shift 1
The density of alkali metals is in the order :
1. A. $Na < K < Cs < Rb$
2. B. $K < Na < Rb < Cs$
3. C. $K < Cs < Na < Rb$
4. D. $Na < Rb < K < Cs$
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Answer: B
Q752023 · 12 Apr 2023 · Shift 1
Match List I with List II | LIST I Type of Hydride | | LIST II Example | | :--- | :--- | :--- | | A. Electron deficient hydride | I. | $Mg H_{2}$ | | B. Electron rich hydride | II. | $HF$ | | C. Electron precise hydride | III. | $B_{2} H_{6}$ | | D. Saline hydride | IV. | $C H_{4}$ | Choose the correct answer from the options given below:
1. A.A-III, B-II, C-I, D-IV
2. B.A-II, B-III, C-I, D-IV
3. C.A-III, B-II, C-IV, D-I
4. D.A-II, B-III, C-IV, D-I
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Answer: C
Q672023 · 11 Apr 2023 · Shift 1
$25 mL$ of silver nitrate solution ( $1 M$ ) is added dropwise to $25 mL$ of potassium iodide ( $1.05 M$ ) solution. The ion(s) present in very small quantity in the solution is/are :
1. A. $I^{-}$ only
2. B. $K^{+}$ only
3. C. $A g^{+}$ and $I^{-}$ both
4. D. $N O_{3}^{-}$ only
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Answer: C
Q802023 · 11 Apr 2023 · Shift 1
Match List-I with List-II: | List - I | | List - II | | :--- | :--- | :--- | | A. $K$ | I. | Thermonuclear reactions | | B. $KCl$ | II. | Fertilizer | | C. $KOH$ | III. | Sodium potassium pump | | D. $Li$ | IV. | Absorbent of $C O_{2}$ | 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
Q742023 · 11 Apr 2023 · Shift 2
Alkali metal from the following with least melting point is :
1. A. $Rb$
2. B. $Na$
3. C. $K$
4. D. $Cs$
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Answer: D
Q782023 · 11 Apr 2023 · Shift 2
Which hydride among the following is less stable?
1. A. $N H_{3}$
2. B. $HF$
3. C. $LiH$
4. D. $Be H_{2}$
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Answer: D
Q882023 · 11 Apr 2023 · Shift 2· Numerical answer
The volume of hydrogen liberated at STP by treating $2.4 g$ of magnesium with excess of hydrochloric acid is _________ $\times 1 0^{- 2} L$ Given : Molar volume of gas is $22.4 L$ at STP. Molar mass of magnesium is $24 g mol^{- 1}$
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Answer: 224
Q792023 · 10 Apr 2023 · Shift 1
Match List I with List II $(A) (B) (C) (D) List I Industry Steel plants Thermal power plants Fertilizer industries Paper mills (I) (II) (III) (IV) List II Waste Generated Gypsum Fly ash Slag Bio-degradable wastes$ 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
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
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Answer: B
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
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
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Answer: C
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 $L i^{+}$ is larger than ionic radius of $M g^{2 +}$ 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
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
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
Q792023 · 8 Apr 2023 · Shift 2
For a good quality cement, the ratio of lime to the total of the oxides of $Si, Al$ and $Fe$ should be as close as possible to :
1. A.3
2. B.2
3. C.1
4. D.4
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Answer: B
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
Q732023 · 1 Feb 2023 · Shift 1
Match List I with List II : | List I | List II | | :--- | :--- | | A. Slaked lime | I. $NaOH$ | | B. Dead burnt plaster | II. $Ca (OH)_{2}$ | | C. Caustic soda | III. $Na_{2} CO_{3} \cdot 10 H_{2} O$ | | D. Washing soda | IV. $CaSO_{4}$ | 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
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 $CO_{2}$ . 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
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Answer: B
Q612023 · 31 Jan 2023 · Shift 1
When $Cu^{2 +}$ ion is treated with $KI$ , 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. $X = CuI_{2} Y = Na_{2} S_{4} O_{6}$
2. B. $X = Cu_{2} I_{2} Y = Na_{2} S_{4} O_{6}$
3. C. $X = CuI_{2} Y = Na_{2} S_{2} O_{3}$
4. D. $X = Cu_{2} I_{2} Y = Na_{2} S_{4} O_{5}$
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Answer: B
Q672023 · 30 Jan 2023 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q792023 · 30 Jan 2023 · Shift 1
Lithium aluminium hydride can be prepared from the reaction of :
1. A. $LiCl$ and $Al_{2} H_{6}$
2. B. $LiH$ and $Al (OH)_{3}$
3. C. $LiH$ and $Al_{2} Cl_{6}$
4. D. $LiCl$ , $Al$ and $H_{2}$
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Answer: C
Q802023 · 30 Jan 2023 · Shift 1
The alkaline earth metal sulphate(s) which are readily soluble in water is/are : A. $BeSO_{4}$ B. $MgSO_{4}$ C. $CaSO_{4}$ D. $SrSO_{4}$ E. $BaSO_{4}$ 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
Q812023 · 29 Jan 2023 · Shift 2· Numerical answer
The volume of $HCl$ , containing $73 g L^{- 1}$ , required to completely neutralise $NaOH$ obtained by reacting $0.69 g$ of metallic sodium with water, is ____ $mL$ . (Nearest Integer) (Given : molar masses of $Na, Cl, O, H$ , are $23, 35.5, 16$ and $1 g mo l^{- 1}$ respectively.)
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Answer: 15