रसायन विज्ञान (Chemistry) – Chemistry MCQ
रसायन विज्ञान (Chemistry) – इन्जिनियरिङ प्रवेश
Chemistry · Engineering Entrance – Mathematics, Physics, Chemistry & English · ७२८ प्रश्न
७२८ 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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The square planar complex [Pt(NH₃)₂Cl₂] shows:
सही उत्तर: क) geometrical (cis–trans) isomerism
In a square planar MA₂B₂ complex, identical ligands can be adjacent (cis) or opposite (trans), giving geometrical isomers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ethylenediamine (H₂N–CH₂–CH₂–NH₂) acts as a ligand that is:
सही उत्तर: घ) bidentate
Each of its two nitrogen atoms donates a lone pair to the metal, forming a five-membered chelate ring, so it is bidentate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Calcination of an ore means:
सही उत्तर: ग) heating it below its melting point in the absence or limited supply of air
Calcination removes volatile matter such as CO₂ from carbonates and water from hydrated ores; roasting is heating in excess air.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Zinc, cadmium and mercury are not regarded as typical transition elements because:
सही उत्तर: ख) they have completely filled d orbitals (d¹⁰) in the ground state and in their common oxidation states
A transition element has an incompletely filled d subshell in the atom or a common ion; Zn, Cd and Hg remain d¹⁰ in their +2 states.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The intense purple colour of KMnO₄ is due to:
सही उत्तर: क) charge transfer from oxygen to manganese
Mn in MnO₄⁻ is +7 with no d electrons, so d–d transitions are impossible; the colour arises from ligand-to-metal charge transfer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The chemical formula commonly used for bleaching powder is:
सही उत्तर: घ) CaOCl₂
Bleaching powder, made by passing Cl₂ over dry slaked lime, is represented as CaOCl₂ (calcium chlorohypochlorite).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The strongest oxidising agent among the halogens is:
सही उत्तर: ग) fluorine
F₂ has the highest standard reduction potential (+2.87 V), so it is the strongest oxidising agent.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Orthophosphoric acid (H₃PO₄) is:
सही उत्तर: ख) tribasic
H₃PO₄ has three P–OH groups, all with ionisable hydrogen, so it is tribasic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ozone (O₃) is related to dioxygen (O₂) as its:
सही उत्तर: क) allotrope
O₂ and O₃ are different molecular forms of the same element, oxygen, so they are allotropes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Permanent hardness of water is due to the presence of:
सही उत्तर: घ) chlorides and sulphates of calcium and magnesium
Chlorides and sulphates of Ca and Mg are not removed by boiling, hence the hardness they cause is permanent.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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