पोखरा र पूर्वाञ्चल विश्वविद्यालय PU / PoU BE प्रवेश तयारी
पोखरा र पूर्वाञ्चल विश्वविद्यालय – PU / PoU BE प्रवेश
PU BE Entrance · Pokhara & Purbanchal University BE
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
BE/B.Arch 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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An aqueous solution of ammonium chloride (NH₄Cl) is:
सही उत्तर: क) Acidic
NH₄Cl is a salt of a strong acid (HCl) and a weak base (NH₄OH); the NH₄⁺ ion hydrolyses to release H⁺, so the solution is acidic. Sodium carbonate, by contrast, gives a basic solution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the molar solubility of CaF₂ is s mol/L, its solubility product Ksp is:
सही उत्तर: घ) 4s³
CaF₂ ⇌ Ca²⁺ + 2F⁻ gives Ksp = (s)(2s)² = 4s³. s² applies to a 1 : 1 salt like AgCl.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The solubility of AgCl in water decreases when NaCl is added. This is due to:
सही उत्तर: ग) Common ion effect
The added Cl⁻ ions shift AgCl(s) ⇌ Ag⁺ + Cl⁻ to the left, lowering solubility; this is the common ion effect. Very high Cl⁻ concentrations can form complexes, but that is not the usual explanation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which mixture acts as an acidic buffer?
सही उत्तर: ख) CH₃COOH + CH₃COONa
An acidic buffer is a weak acid with its salt of a strong base, like acetic acid and sodium acetate. NH₄OH + NH₄Cl is a basic buffer; HCl + NaCl contains a strong acid and cannot buffer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The conjugate base of HSO₄⁻ is:
सही उत्तर: घ) SO₄²⁻
A conjugate base is formed when an acid loses a proton: HSO₄⁻ − H⁺ → SO₄²⁻. H₂SO₄ is the conjugate acid of HSO₄⁻.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The pH of a 0.01 M NaOH solution at 25 °C is:
सही उत्तर: ग) 12
[OH⁻] = 10⁻² M gives pOH = 2, so pH = 14 − 2 = 12. A pH of 2 is the pOH mistakenly reported as pH.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For which reaction is Kp equal to Kc?
सही उत्तर: क) H₂(g) + I₂(g) ⇌ 2HI(g)
Kp = Kc(RT)^Δn, and for H₂ + I₂ ⇌ 2HI, Δn = 2 − 2 = 0, so Kp = Kc. The other reactions involve a change in the number of gaseous moles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For the isothermal expansion of an ideal gas, the change in internal energy (ΔU) is:
सही उत्तर: घ) Zero
The internal energy of an ideal gas depends only on temperature, so at constant temperature ΔU = 0. The heat absorbed then equals the work done by the gas, but ΔU itself is zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which process is accompanied by an increase in entropy?
सही उत्तर: ग) Melting of ice
Melting turns an ordered solid into a more disordered liquid, increasing entropy. Freezing and condensation both increase order, so entropy decreases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For the reaction N₂(g) + 3H₂(g) → 2NH₃(g), the relation between ΔH and ΔU is:
सही उत्तर: ख) ΔH = ΔU − 2RT
ΔH = ΔU + Δn_g RT with Δn_g = 2 − 4 = −2, giving ΔH = ΔU − 2RT. −4RT counts only the reactant moles and forgets the 2 mol of product.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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