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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A buffer contains 0.1 M NH₃ and 0.1 M NH₄Cl. If pKb of NH₃ is 4.75, the pH of the buffer at 25 °C is:
सही उत्तर: घ) 9.25
pOH = pKb + log([salt]/[base]) = 4.75 + 0 = 4.75; pH = 14 − 4.75 = 9.25.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For the exothermic reaction 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), the equilibrium yield of SO₃ is increased by:
सही उत्तर: ख) lowering the temperature and raising the pressure
By Le Chatelier's principle, a lower temperature favours the exothermic forward reaction and a higher pressure favours the side with fewer gas moles (2 versus 3).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For the equilibrium CaCO₃(s) ⇌ CaO(s) + CO₂(g), the equilibrium constant Kp is equal to:
सही उत्तर: घ) the partial pressure of CO₂
Pure solids have unit activity and do not appear in the expression, so Kp = p(CO₂).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enthalpy of fusion of ice at 0 °C is 6.0 kJ/mol. The entropy change when one mole of ice melts at 0 °C is about:
सही उत्तर: ग) 22 J K⁻¹ mol⁻¹
ΔS = ΔH/T = 6000/273 ≈ 22 J K⁻¹ mol⁻¹.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enthalpies of combustion of C(graphite), H₂(g) and CH₄(g) are −393.5, −285.8 and −890.3 kJ/mol respectively. The enthalpy of formation of methane is:
सही उत्तर: ख) −74.8 kJ/mol
ΔH_f(CH₄) = ΔH_c(C) + 2ΔH_c(H₂) − ΔH_c(CH₄) = −393.5 − 571.6 + 890.3 = −74.8 kJ/mol.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enthalpy of combustion of methane is −890 kJ/mol. The heat released on complete combustion of 4 g of methane is:
सही उत्तर: घ) 222.5 kJ
4 g CH₄ = 4/16 = 0.25 mol; heat released = 0.25 × 890 = 222.5 kJ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The osmotic pressure at 27 °C of a 5% (w/v) glucose solution, often used as an intravenous drip, is about (M of glucose = 180, R = 0.0821 L atm K⁻¹ mol⁻¹):
सही उत्तर: ख) 6.8 atm
5% w/v = 50 g/L = 50/180 = 0.278 M; π = CRT = 0.278 × 0.0821 × 300 ≈ 6.8 atm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solution of 1.8 g of a non-volatile non-electrolyte in 100 g of water boils 0.052 K above the boiling point of water. If K_b of water is 0.52 K kg mol⁻¹, the molar mass of the solute is:
सही उत्तर: क) 180 g/mol
m = ΔT_b/K_b = 0.052/0.52 = 0.1 mol/kg; moles in 0.1 kg = 0.01; M = 1.8/0.01 = 180 g/mol.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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6.2 g of ethylene glycol (C₂H₆O₂, M = 62) is dissolved in 100 g of water. The depression in freezing point is (K_f of water = 1.86 K kg mol⁻¹):
सही उत्तर: ग) 1.86 K
Molality = (6.2/62)/0.1 kg = 1 m; ΔT_f = K_f × m = 1.86 × 1 = 1.86 K.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When red blood cells are placed in distilled water, they:
सही उत्तर: क) swell and may burst
Distilled water is hypotonic to the cell contents, so water enters the cells by osmosis; they swell and may burst (haemolysis).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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