रसायन विज्ञान (Chemistry) – Chemistry MCQ

रसायन विज्ञान (Chemistry): प्रश्न र उत्तर

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सही: ० / ०

221. Which of the following combinations of elements would likely form an ionic compound?

     कa) H₂ and O₂ खb) Na and Cl गc) C and O घd) K and S
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222. The process of adding a reagent to a solution that decreases the concentration of hydrogen ions (H⁺) is termed:

     कa) Neutralization खb) Oxidation गc) Acidification घd) Reduction
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223. Which of the following statements best describes the concept of electronegativity?

     कa) It is a measure of an atom's tendency to lose electrons in a chemical bond. खb) It is a measure of an atom’s ability to attract bonding pairs of electrons towards itself in a chemical bond. गc) It solely determines the type of chemical bond formed between two atoms. घd) It only influences the size of an atom.
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224. A solution is prepared by dissolving 1 mole of anhydrous CuSO₄ in water. What is the concentration of H₂SO₄ needed to prepare a similar solution?

     क0.5 M ख1 M ग2 M घ4 M
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225. Heating sodium acetate with soda lime (NaOH + CaO) produces: A. Sodium carbonate, water and carbon dioxide B. Calcium hydroxide, water and carbon dioxide C. Sodium chloride, water and calcium oxide D. Carbonate of sodium, calcium oxide and water

     कA. Sodium carbonate, water and carbon dioxide खB. Calcium hydroxide, water and carbon dioxide गC. Sodium chloride, water and calcium oxide घD. Carbonate of sodium, calcium oxide and water
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226. The primary product formed during the reaction of sodium metal with carbon dioxide is:

     कSodium carbonate खSodium bicarbonate गSodium formate घSodium acetate
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227. Which of the following will increase the rate of a hydrolysis reaction?

     कA. Decreasing the concentration of the acid खB. Decreasing the temperature गC. Increasing the concentration of the base घD. Removing a catalyst
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228. The oxidation number of chromium (Cr) in Cr₂O₇²⁻ ion is:

     क+2 ख+3 ग+6 घ+7
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229. Which of the following statements accurately describes the effect of increasing temperature on reaction rates?

     कA. Reaction rates always increase with increasing temperature due to increased kinetic energy of molecules खB. Reaction rates decrease with increasing temperature as reactants require more energy to overcome activation energy barriers गC. The rate of a reaction remains constant regardless of temperature changes घD. Temperature has no effect on the speed of a chemical reaction
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230. The pH of a 0.01 M aqueous solution of acetic acid (CH₃COOH) is measured to be 3.76. What is the value of Ka for acetic acid?

     क1.8 x 10⁻⁵ ख2.0 x 10⁻⁴ ग3.0 x 10⁻³ घ4.0 x 10⁻²
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