NEET-UG 2025 · Code 45

Energy and radius of first Bohr orbit of He⁺ and Li²⁺ are [Given R_H = 2.18 × 10⁻¹⁸ J, a₀ = 52.9 pm]

1. AE_n(Li²⁺) = −19.62×10⁻¹⁸ J; r_n(Li²⁺) = 17.6 pm; E_n(He⁺) = −8.72×10⁻¹⁸ J; r_n(He⁺) = 26.4 pm
2. BE_n(Li²⁺) = −8.72×10⁻¹⁸ J; r_n(Li²⁺) = 26.4 pm; E_n(He⁺) = −19.62×10⁻¹⁸ J; r_n(He⁺) = 17.6 pm
3. CE_n(Li²⁺) = −19.62×10⁻¹⁶ J; r_n(Li²⁺) = 17.6 pm; E_n(He⁺) = −8.72×10⁻¹⁶ J; r_n(He⁺) = 26.4 pm
4. DE_n(Li²⁺) = −8.72×10⁻¹⁶ J; r_n(Li²⁺) = 17.6 pm; E_n(He⁺) = −19.62×10⁻¹⁶ J; r_n(He⁺) = 17.6 pm

Which of the following are paramagnetic?

1. A[NiCl₄]²⁻
2. BNi(CO)₄
3. C[Ni(CN)₄]²⁻
4. D[Ni(H₂O)₆]²⁺
5. ENi(PPh₃)₄ Choose the correct answer from the options given below:

Given below are two statements : Statement I : Like nitrogen that can form ammonia, arsenic can form arsine. Statement II : Antimony cannot form antimony pentoxide. 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

Which among the following electronic configurations belong to main group elements?

1. A[Ne]3s¹
2. B[Ar]3d³ 4s²
3. C[Kr]4d¹⁰ 5s² 5p⁵
4. D[Ar]3d¹⁰ 4s¹
5. E[Rn]5f⁰ 6d² 7s² Choose the correct answer from the option given below :

Dalton’s Atomic theory could not explain which of the following?

1. ALaw of conservation of mass
2. BLaw of constant proportion
3. CLaw of multiple proportion
4. DLaw of gaseous volume

Consider the following compounds : KO₂, H₂O₂ and H₂SO₄. The oxidation states of the underlined elements in them are, respectively,

1. A+1, −1, and +6
2. B+2, −2, and +6
3. C+1, −2, and +4
4. D+4, −4, and +6

If the half-life (t₁/₂) for a first order reaction is 1 minute, then the time required for 99.9% completion of the reaction is closest to :

1. A2 minutes
2. B4 minutes
3. C5 minutes
4. D10 minutes

The correct order of the wavelength of light absorbed by the following complexes is,

1. A[Co(NH₃)₆]³⁺
2. B[Co(CN)₆]³⁻
3. C[Cu(H₂O)₄]²⁺
4. D[Ti(H₂O)₆]³⁺ Choose the correct answer from the options given below: