p-Block Elements · JEE Main previous year questions

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2022 41 questions

Q642022 · 27 Jun 2022 · Shift 2
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Fluorine forms one oxoacid. Reason R : Fluorine has smallest size amongst all halogens and is highly electronegative. 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 and R is the correct explanation of A.
2. B.Both A and R are correct but R is NOT 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.
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Answer: A
Q812022 · 27 Jun 2022 · Shift 2· Numerical answer
$116 g$ of a substance upon dissociation reaction, yields $7.5 g$ of hydrogen, $60 g$ of oxygen and $48.5 g$ of carbon. Given that the atomic masses of H, O and C are $1$ , $16$ and $12$ , respectively. The data agrees with how many formulae of the following? A. $CH_{3} COOH$ , B. $HCHO$ , C. $CH_{3} OOCH_{3}$ , D. $CH_{3} CHO$
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Answer: 2
Q882022 · 27 Jun 2022 · Shift 2· Numerical answer
$0.25 g$ of an organic compound containing chlorine gave $0.40 g$ of silver chloride in Carius estimation. The percentage of chlorine present in the compound is ________. [in nearest integer] (Given : Molar mass of Ag is $108 g mol^{- 1}$ and that of Cl is $35.5 g mol^{- 1}$ )
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Answer: 40
Q662022 · 26 Jun 2022 · Shift 1
Given below are two statements : Statement I : In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed. Statement II : If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give $NaCN$ and $N a_{2} S$ . In the light of the above statements, choose the most appropriate answer from the options given below :
1. A.Both Statement I and Statement II are correct.
2. B.Both Statement I and Statement II are incorrect.
3. C.Statement I is correct but Statement II is incorrect.
4. D.Statement I is incorrect but Statement II is correct.
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Answer: A
Q772022 · 26 Jun 2022 · Shift 1
Consider the following reaction : $A + alkali \to B (Major Product)$ If B is an oxoacid of phosphorus with no P-H bond, then A is :
1. A.White $P_{4}$
2. B.Red $P_{4}$
3. C. $P_{2} O_{3}$
4. D. $H_{3} PO_{3}$
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Answer: B
Q642022 · 26 Jun 2022 · Shift 2
The oxide which contains an odd electron at the nitrogen atom is :
1. A. $N_{2} O$
2. B. $N O_{2}$
3. C. $N_{2} O_{3}$
4. D. $N_{2} O_{5}$
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Answer: B
Q702022 · 26 Jun 2022 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: C
Q812022 · 26 Jun 2022 · Shift 2· Numerical answer
CNG is an important transportation fuel. When $100 g$ CNG is mixed with $208 g$ oxygen in vehicles, it leads to the formation of $C O_{2}$ and $H_{2} O$ and produces large quantity of heat during this combustion, then the amount of carbon dioxide, produced in grams is ____. [nearest integer] [Assume CNG to be methane]
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Answer: 143
Q642022 · 25 Jun 2022 · Shift 1
White precipitate of $AgCl$ dissolves in aqueous ammonia solution due to formation of :
1. A. $[Ag (NH_{3})_{4}] Cl_{2}$
2. B. $[Ag (Cl)_{2} (NH_{3})_{2}]$
3. C. $[Ag (NH_{3})_{2}] Cl$
4. D. $[Ag (NH_{3}) Cl] Cl$
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Answer: C
Q652022 · 25 Jun 2022 · Shift 1
Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?
1. A.It will not prefer to undergo redox reactions.
2. B.It will prefer to gain electron and act as an oxidizing agent.
3. C.It will prefer to give away an electron and behave as reducing agent.
4. D.It acts as both, oxidizing and reducing agent.
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Answer: B
Q672022 · 25 Jun 2022 · Shift 1
Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?
1. A.Chromatographic separation
2. B.Fractional Crystallisation
3. C.Steam distillation
4. D.Sublimation
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Answer: C
Q742022 · 25 Jun 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: C
Q762022 · 25 Jun 2022 · Shift 1
Leaching of gold with dilute aqueous solution of $NaCN$ in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :
1. A. $[A u (C N)_{4}]^{-}$ and $[Z n (C N)_{2} (O H)_{2}]^{2 -}$
2. B. $[A u (C N)_{2}]^{-}$ and $[Z n (O H)_{4}]^{2 -}$
3. C. $[A u (C N)_{2}]^{-}$ and $[Z n (C N)_{4}]^{2 -}$
4. D. $[A u (C N)_{4}]^{2 -}$ and $[Z n (C N)_{6}]^{4 -}$
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Answer: C
Q892022 · 25 Jun 2022 · Shift 1· Numerical answer
Number of grams of bromine that will completely react with $5.0 g$ of pent-1-ene is $\times 1 0^{- 2} g$ . (Atomic mass of $Br = 80 g/mol$ ) [Nearest Integer]
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Answer: 1143
Q782022 · 25 Jun 2022 · Shift 2
The number of bridged oxygen atoms present in compound B formed from the following reactions is $Pb (N O_{3})_{2} 673 K A + PbO + O_{2}$ $A Dimerise B$
1. A.0
2. B.1
3. C.2
4. D.3
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Answer: A
Q882022 · 25 Jun 2022 · Shift 2· Numerical answer
A rigid nitrogen tank stored inside a laboratory has a pressure of $30 atm$ at 06:00 am when the temperature is $2 7^{\circ} C$ . At 03:00 pm, when the temperature is $4 5^{\circ} C$ , the pressure in the tank will be ____ $atm$ . [nearest integer]
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Answer: 32