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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One faraday of electricity is approximately equal to:
सही उत्तर: घ) 96500 C
One faraday is the charge of one mole of electrons: 6.022 × 10²³ × 1.602 × 10⁻¹⁹ ≈ 96500 C. 1.6 × 10⁻¹⁹ C is the charge of a single electron.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A first-order reaction has a half-life of 20 min. The time required for 75% completion is:
सही उत्तर: क) 40 min
75% completion leaves 25% (¼) of the reactant, which takes two half-lives: 2 × 20 = 40 min. 30 min wrongly assumes the reaction proceeds linearly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The unit of the rate constant for a zero-order reaction is:
सही उत्तर: क) mol L⁻¹ s⁻¹
For a zero-order reaction, rate = k, so k has the units of rate, mol L⁻¹ s⁻¹. s⁻¹ is the unit for a first-order rate constant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The rate constant of a first-order reaction is 0.0693 min⁻¹. Its half-life is:
सही उत्तर: ख) 10 min
For a first-order reaction, t½ = 0.693/k = 0.693/0.0693 = 10 min. The half-life of a first-order reaction does not depend on initial concentration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An aqueous solution of which salt is basic?
सही उत्तर: क) CH₃COONa
Sodium acetate is a salt of a weak acid and strong base; the acetate ion hydrolyses to produce OH⁻. NH₄Cl gives an acidic solution because NH₄⁺ hydrolyses to release H⁺.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The solubility product (Ksp) of a sparingly soluble salt AB₂ with solubility s mol L⁻¹ is:
सही उत्तर: घ) 4s³
AB₂ ⇌ A²⁺ + 2B⁻ gives [A²⁺] = s and [B⁻] = 2s, so Ksp = s(2s)² = 4s³. 27s⁴ applies to salts of type AB₃.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following mixtures acts as a buffer solution?
सही उत्तर: घ) CH₃COOH + CH₃COONa
A buffer is a weak acid with its salt of a strong base (or a weak base with its salt), and acetic acid with sodium acetate fits this. HCl + NaCl involves a strong acid and cannot resist pH change.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a Lewis acid?
सही उत्तर: ख) BF₃
BF₃ has an incomplete octet on boron and can accept a lone pair, making it a Lewis acid. NH₃, H₂O and OH⁻ donate lone pairs and are Lewis bases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The conjugate acid of NH₃ is:
सही उत्तर: ग) NH₄⁺
Adding a proton (H⁺) to a base gives its conjugate acid, so NH₃ + H⁺ → NH₄⁺. NH₂⁻ is the conjugate base of NH₃.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The pH of 0.01 M NaOH solution at 25 °C is:
सही उत्तर: घ) 12
[OH⁻] = 10⁻² M gives pOH = 2, so pH = 14 − 2 = 12. A pH of 2 would be for 0.01 M strong acid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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