रसायन विज्ञान (Chemistry) – Chemistry MCQ
रसायन विज्ञान (Chemistry) – CEE प्रवेश
Chemistry · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४१० प्रश्न
४१० प्रश्न उपलब्ध। मोड छान्नुहोस्:
रसायन विज्ञान (Chemistry): 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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Vitamin B₁₂ (cyanocobalamin) is a coordination compound of:
सही उत्तर: ख) cobalt
Vitamin B₁₂ contains a cobalt ion at the centre of a corrin ring; its deficiency causes pernicious anaemia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cisplatin, a drug used in cancer chemotherapy, is:
सही उत्तर: ग) cis-[Pt(NH₃)₂Cl₂]
Cisplatin is the cis isomer of diamminedichloridoplatinum(II); it binds to DNA and stops cancer cells from dividing, while the trans isomer is not effective.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The shape of the xenon trioxide (XeO₃) molecule is:
सही उत्तर: क) Trigonal pyramidal
Xe in XeO₃ has three bonded O atoms and one lone pair (sp³), so the molecule is trigonal pyramidal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among the group 15 hydrides, the strongest reducing agent is:
सही उत्तर: ख) BiH₃
The E–H bond becomes weaker down the group, so BiH₃ gives up hydrogen most easily and is the strongest reducing agent.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among the hydrides NH₃, PH₃, AsH₃ and SbH₃, the one with the largest H–E–H bond angle is:
सही उत्तर: घ) NH₃
The small, highly electronegative N pulls bond pairs close to it, increasing bond-pair repulsion; the angle falls from about 107° in NH₃ to about 91° in SbH₃.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The thermodynamically stable allotrope of sulphur at room temperature is:
सही उत्तर: ग) rhombic (α) sulphur
Rhombic sulphur is stable below about 369 K (95.5 °C); above this transition temperature monoclinic sulphur is stable.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Deep-sea divers breathe a mixture of oxygen and helium instead of air mainly because helium:
सही उत्तर: क) is much less soluble in blood than nitrogen
Nitrogen dissolves in blood under high pressure and causes 'the bends' on decompression; helium is far less soluble, so it is used to dilute oxygen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The 'barium meal' swallowed by a patient before an X-ray examination of the stomach and intestines contains:
सही उत्तर: घ) barium sulphate
BaSO₄ is very insoluble (so not poisonous) and opaque to X-rays, so it outlines the digestive tract; soluble barium salts are toxic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Plaster of Paris is used in hospitals for making casts to support fractured bones because, when mixed with water, it:
सही उत्तर: घ) sets into a hard mass of gypsum
CaSO₄·½H₂O takes up water and sets into hard gypsum, CaSO₄·2H₂O, with a slight expansion that gives a firm cast.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a reaction with the rate law rate = k[A]^(1/2)[B]^(3/2), the overall order of the reaction is:
सही उत्तर: ग) 2
Overall order = sum of the exponents = 1/2 + 3/2 = 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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