रसायन विज्ञान (Chemistry) – Chemistry MCQ

रसायन विज्ञान (Chemistry): प्रश्न र उत्तर

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सही: ० / ०

71. Which of the following solutions will exhibit a neutral pH?

    कA) Solution containing HCl खB) Solution containing NaOH गC) Solution containing CH₃COOH घD) Solution containing NH₄Cl
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72. The decomposition of lead(II) nitrate in the presence of dilute nitric acid produces:

    कLead monoxide, nitrogen gas, and water खLead carbonate, nitrogen dioxide, and water गLead hydroxide, nitrogen gas, and oxygen घLead oxide, nitrogen dioxide, and water
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73. The process in which a solid directly transforms into gaseous state without passing through liquid phase is called:

    कSublimation खDeposition गMelting घCondensation
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74. Which of the following statements accurately describes Avogadro’s hypothesis?

    कEqual volumes of all gases, at the same temperature and pressure, contain an equal number of molecules खEqual masses of all elements contain an equal number of atoms गAll atoms are indivisible particles घMolecules are the smallest unit of matter that retains chemical properties
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75. What is the volume of 0.5 M NaOH solution required to completely neutralize 100 mL of 0.2 M H₂SO₄ solution?

    क50 mL ख100 mL ग200 mL घ400 mL
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76. A 25.0 mL solution of a hydrochloric acid (HCl) requires 18.40 mL of 0.300 M sodium hydroxide (NaOH) for neutralization. What is the molarity of the HCl solution?

    क0.100 M ख0.600 M ग1.20 M घ2.40 M
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77. Which of the following describes the relationship between ionic product (Ksp) and solubility of a sparingly soluble salt?

    कKsp increases with increasing solubility खKsp decreases with increasing solubility गKsp remains constant regardless of solubility घKsp is only affected by temperature
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78. The decomposition of lead(II) iodide (PbI₂) is represented by the following balanced equation: 2PbI₂(s) → 2Pb(s) + I₂(s). If a sample of 10.0g PbI₂ decomposes completely, what mass of iodine (I₂) will be produced?

    क3.64 g ख5.33 g ग8.00 g घ10.0 g
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79. The oxidation number of chromium (Cr) changes from +6 to +3 in the following chemical reaction: Cr₂O₉²⁻ + 8H⁺ → 2Cr³⁺ + 9H₂O. Which of the following correctly describes this change?

    कIt is an exothermic process खIt involves reduction of chromium गIt involves oxidation of chromium घThe number of electrons gained is constant
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80. Plaster of Paris is used in hospitals for making casts to support fractured bones because, when mixed with water, it undergoes a rapid hydration reaction, forming a hard, porous material that provides initial support. This contrasts sharply with cement which sets much slower and is less suitable for this purpose. Which of the following statements accurately describes the chemical process involved?

    कIt forms a strong covalent bond with calcium ions in bone tissue खIt undergoes a decomposition reaction releasing carbon dioxide गIt forms hydrated plaster crystals (CaSO₄·2H₂O) through exothermic hydration घIt reacts directly with the patient's blood to initiate clotting
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