चिकित्सा शिक्षा आयोग (CEE) बीएस्सी नर्सिङ र बीएनएस प्रवेश तयारी
चिकित्सा शिक्षा आयोग (CEE) – बीएस्सी नर्सिङ र बीएनएस प्रवेश
B.Sc. Nursing & BNS Entrance · Medical Education Commission – CEE
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
MBBS/BDS/Nursing 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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Temporary hardness of water is due to the presence of:
सही उत्तर: क) Bicarbonates of calcium and magnesium
Ca(HCO₃)₂ and Mg(HCO₃)₂ decompose on boiling into insoluble carbonates, so the hardness can be removed by boiling. Chlorides and sulphates cause permanent hardness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Physical adsorption (physisorption) of a gas on a solid:
सही उत्तर: ग) Decreases with increase in temperature
Physisorption is exothermic and held by weak van der Waals forces, so it decreases as temperature rises. Chemisorption involves chemical bond formation and is usually irreversible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For coagulating a negatively charged colloidal sol (e.g. As₂S₃ sol), the most effective ion is:
सही उत्तर: ख) Al³⁺
By the Hardy–Schulze rule, coagulating power increases with the charge of the oppositely charged ion, so Al³⁺ is most effective. PO₄³⁻ carries the same sign as the sol and would coagulate a positive sol instead.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The scattering of light by colloidal particles is known as:
सही उत्तर: ग) Tyndall effect
Colloidal particles are large enough to scatter light, making the beam's path visible (Tyndall effect). Brownian motion is the random zig-zag movement of colloidal particles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Raoult's law, the relative lowering of vapour pressure of a dilute solution is equal to:
सही उत्तर: क) Mole fraction of the solute
(P° − P)/P° = x(solute) for a solution of a non-volatile solute. The vapour pressure of the solution itself is proportional to the mole fraction of the solvent.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following 0.1 m aqueous solutions has the highest boiling point?
सही उत्तर: ग) Al₂(SO₄)₃
Boiling point elevation depends on the number of solute particles; Al₂(SO₄)₃ gives 5 ions (i = 5). Glucose does not dissociate (i = 1) and has the smallest effect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Assuming complete dissociation, the van't Hoff factor (i) for K₂SO₄ is:
सही उत्तर: क) 3
K₂SO₄ → 2K⁺ + SO₄²⁻, giving 3 ions per formula unit, so i = 3. For NaCl, i would be 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is the strongest reducing agent in aqueous solution?
सही उत्तर: घ) Li
Lithium has the most negative standard reduction potential (about −3.04 V), so it loses electrons most readily in water. This is due to the very high hydration energy of the small Li⁺ ion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Given E°(Cu²⁺/Cu) = +0.34 V and E°(Zn²⁺/Zn) = −0.76 V, the standard EMF of the Daniell cell is:
सही उत्तर: ख) 1.10 V
E°cell = E°cathode − E°anode = 0.34 − (−0.76) = 1.10 V. Taking the difference of the magnitudes (0.76 − 0.34) gives the incorrect 0.42 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The mass of silver deposited when 1 faraday of electricity is passed through AgNO₃ solution is (Ag = 108):
सही उत्तर: ख) 108 g
Ag⁺ + e⁻ → Ag, so 1 F (1 mol of electrons) deposits 1 mol = 108 g of silver. 54 g would apply to a divalent ion of the same atomic mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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