JEE Main 2024 · 9 Apr 2024 Shift 1

Compare the energies of following sets of quantum numbers for multielectron system.

1. An = 4, l = 1
2. Bn = 4, l = 2
3. Cn = 3, l = 1
4. Dn = 3, l = 2
5. En = 4, l = 0 Choose the correct answer from the options given below :

In which one of the following pairs the central atoms exhibit sp² hybridization ?

1. ANH₂⁻ and H₂O
2. BBF₃ and NO₂⁻
3. CH₂O and NO₂
4. DNH₂⁻ and BF₃

Given below are two statements : Statement (I) : The oxidation state of an element in a particular compound is the charge acquired by its atom on the basis of electron gain enthalpy consideration from other atoms in the molecule. Statement (II) : pπ–pπ bond formation is more prevalent in second period elements over other periods. In the light of the above statements, choose the most appropriate answer from the options given below :

1. ABoth Statement I and Statement II are correct
2. BBoth Statement I and Statement II are incorrect
3. CStatement I is correct but Statement II is incorrect
4. DStatement I is incorrect but Statement II is correct

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Both rhombic and monoclinic sulphur exist as S₈ while oxygen exists as O₂. Reason (R) : Oxygen forms pπ–pπ multiple bonds with itself and other elements having small size and high electronegativity like C, N, which is not possible for sulphur. In the light of the above statements, choose the most appropriate answer from the options given below :

1. ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
2. BBoth (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

The F⁻ ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.

1. A[3(Ca₃(PO₄)₂) · Ca(OH)₂]
2. B[3(Ca₂(PO₄)₂) · Ca(OH)₂]
3. C[3(Ca₃(PO₄)₂) · CaF₂]
4. D[3(Ca₃(PO₄)₃) · CaF₂]

The electronic configuration of Cu(II) is 3d⁹ whereas that of Cu(I) is 3d¹⁰. Which of the following is correct ?

1. ACu(II) is more stable
2. BCu(II) is less stable
3. CCu(I) and Cu(II) are equally stable
4. DStability of Cu(I) and Cu(II) depends on nature of copper salts

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The total number of geometrical isomers shown by [Co(en)₂Cl₂]⁺ complex ion is three. Reason (R) : [Co(en)₂Cl₂]⁺ complex ion has an octahedral geometry. In the light of the above statements, choose the most appropriate answer from the options given below :

1. ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
2. BBoth (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

Methods used for purification of organic compounds are based on :

1. Anature of compound only.
2. Bpresence of impurity only.
3. Cnature of compound and presence of impurity.
4. Dneither on nature of compound nor on the impurity present.