JEE Main 2024 · 29 Jan 2024 Shift 1

The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is :

1. A5, 0, 0, +1/2
2. B5, 1, 0, +1/2
3. C5, 1, 1, +1/2
4. D5, 0, 1, +1/2

Which of the following is not correct?

1. AΔG is zero for a reversible reaction
2. BΔG is positive for a spontaneous reaction
3. CΔG is negative for a spontaneous reaction
4. DΔG is positive for a non-spontaneous reaction

Chlorine undergoes disproportionation in alkaline medium as shown below : a Cl₂(g) + b OH⁻(aq) → c ClO⁻(aq) + d Cl⁻(aq) + e H₂O(l) The values of a, b, c and d in a balanced redox reaction are respectively :

1. A2, 4, 1 and 3
2. B2, 2, 1 and 3
3. C1, 2, 1 and 1
4. D3, 4, 4 and 2

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : The first ionisation enthalpy decreases across a period. Reason R : The increasing nuclear charge outweighs the shielding across the period. In the light of the above statements, choose the most appropriate from the options given below :

1. ABoth A and R are true and R is the correct explanation of A
2. BBoth A and R are true but R is NOT the correct explanation of A
3. CA is true but R is false

Identify the incorrect pair from the following :

1. ACryolite – Na₃AlF₆
2. BCarnallite – KCl·MgCl₂·6H₂O
3. CFluorspar – BF₃
4. DFluoroapatite – 3 Ca₃(PO₄)₂·CaF₂

Given below are two statements : Statement I : The electronegativity of group 14 elements from Si to Pb, gradually decreases. Statement II : Group 14 contains non-metallic, metallic, as well as metalloid elements. In the light of the above statements, choose the most appropriate from the options given below :

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

KMnO₄ decomposes on heating at 513K to form O₂ along with

1. AMnO₂ & K₂O₂
2. BK₂MnO₄ & MnO₂
3. CMn & KO₂
4. DK₂MnO₄ & Mn

In which one of the following metal carbonyls, CO forms a bridge between metal atoms?

1. A[Mn₂(CO)₁₀]
2. B[Co₂(CO)₈]
3. C[Os₃(CO)₁₂]
4. D[Ru₃(CO)₁₂]