मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · २,०३९ प्रश्न
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
CEE प्रवेश: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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According to Bohr's model, the energy of the electron in the second orbit (n = 2) of a hydrogen atom is:
सही उत्तर: ग) −3.4 eV
Eₙ = −13.6/n² eV, so E₂ = −13.6/4 = −3.4 eV. −1.51 eV is the energy for n = 3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ground-state electronic configuration of chromium (Z = 24) is:
सही उत्तर: क) [Ar] 3d⁵ 4s¹
Chromium adopts 3d⁵ 4s¹ because a half-filled d subshell has extra stability from exchange energy. Copper shows a similar exception (3d¹⁰ 4s¹).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The total number of orbitals in the shell with principal quantum number n = 3 is:
सही उत्तर: क) 9
The number of orbitals in a shell is n² = 9 (one 3s, three 3p, five 3d). 18 is the maximum number of electrons (2n²), not orbitals.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum number of electrons that can be accommodated in a subshell with l = 2 is:
सही उत्तर: ख) 10
For l = 2 (d subshell), there are 2l + 1 = 5 orbitals, each holding 2 electrons, i.e. 10 electrons. 14 is for the f subshell (l = 3).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A gas at 27 °C is heated to 327 °C at constant pressure. Its volume becomes:
सही उत्तर: घ) Twice the original
Charles' law uses absolute temperature: 300 K → 600 K, so the volume doubles. Using °C (27 → 327) wrongly suggests about a 12-fold increase.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ratio of the rates of diffusion of H₂ and O₂ under identical conditions is:
सही उत्तर: क) 4 : 1
By Graham's law, rate ∝ 1/√M, so r(H₂)/r(O₂) = √(32/2) = 4. 16 : 1 is the ratio of molar masses, not rates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At constant temperature, if the pressure of a fixed mass of gas is doubled, its volume becomes:
सही उत्तर: क) Half
By Boyle's law, PV = constant at fixed temperature, so doubling P halves V. Volume doubles with temperature (in kelvin) at constant pressure, which is Charles' law.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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4 g of H₂ reacts with 16 g of O₂ to form water. The mass of water formed is:
सही उत्तर: घ) 18 g
4 g H₂ = 2 mol and 16 g O₂ = 0.5 mol; 2H₂ + O₂ → 2H₂O, so O₂ is limiting and gives 1 mol (18 g) of water. 36 g would assume H₂ fully reacts, but there is not enough oxygen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The percentage of nitrogen by mass in urea, CO(NH₂)₂, is approximately:
सही उत्तर: ख) 46.7%
Molar mass of urea is 60 g/mol and it contains 28 g of nitrogen, so %N = 28/60 × 100 ≈ 46.7%. This high nitrogen content makes urea a popular fertilizer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The equivalent mass of H₂SO₄ (molar mass 98 g/mol) is:
सही उत्तर: ग) 49
Equivalent mass = molar mass / basicity = 98/2 = 49. 98 would be correct only if the acid were monobasic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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