Chemistry Multiple Choice Quiz - Electrolysis
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Questions and Answers

Which of the following metals reacts with hot concentrated aqueous alkali to evolve hydrogen?

  • Copper
  • Sodium
  • Iron
  • Aluminium (correct)

    • Which of the following statements is TRUE about the electrolysis of dilute common salt?

  • Hydrogen is obtained at the cathode because hydrogen ions have a higher concentration than sodium ions.
  • Sodium ions have a lesser tendency to get reduced than hydrogen ions. (correct)
  • Sodium is solid and hydrogen is a gas.
  • Both A and C.

    • What is the reason for the observation that concentrated sulfuric acid reacts with ethanol to produce a gas that decolorizes bromine water?

  • Concentrated sulfuric acid is a strong oxidizing agent.
  • Concentrated sulfuric acid is a strong dehydrating agent.
  • Ethanol is a reducing agent.
  • All of the above. (correct)

    • Which of the following solutions can be used to chemically distinguish dilute HCl from dilute HNO3?

    <p>FeSO4 solution</p> Signup and view all the answers

    Which of the following particles is responsible for electrical conductivity in a metal X that cannot displace hydrogen from dilute hydrochloric acid?

    <p>Free electrons</p> Signup and view all the answers

    What is the balanced chemical equation for the reaction between excess ammonia and chlorine?

    <p>$2NH_3 + 3Cl_2 \longrightarrow N_2 + 6HCl$</p> Signup and view all the answers

    What is the name of the process used to manufacture nitric acid on a large scale?

    <p>Ostwald process</p> Signup and view all the answers

    What is the balanced chemical equation for the first step in the Ostwald process?

    <p>$4NH_3 + 5O_2 \longrightarrow 4NO + 6H_2O$</p> Signup and view all the answers

    What is the chemical formula for the electrolyte used in the Hall-Héroult process for the extraction of aluminium?

    <p>$Na_3AlF_6$</p> Signup and view all the answers

    What is the balanced chemical equation for the reaction that occurs at the cathode during the electrolytic reduction of alumina?

    <p>$Al^{3+} + 3e^- \longrightarrow Al$</p> Signup and view all the answers

    What is the empirical formula of the inorganic compound with the following composition: Na = 14.31%, S = 9.97%, H = 6.22%, and O = 69.5%?

    <p>$Na_2SO_4.10H_2O$</p> Signup and view all the answers

    Which of the following is the correct observation when ethene gas is passed through bromine in CCl4?

    <p>The bromine solution turns colorless.</p> Signup and view all the answers

    What do you observe when dilute sulfuric acid is added to a solution of lead (II) nitrate?

    <p>A white precipitate is formed.</p> Signup and view all the answers

    Which of the following compounds will NOT conduct electricity when dissolved in water?

    <p>Glycerol</p> Signup and view all the answers

    What is the general formula of the homologous series to which C4H6 belongs?

    <p>C_nH_(2n-2)</p> Signup and view all the answers

    What is the atomic number of the element whose hydride contains 6 hydrogen atoms?

    <p>16</p> Signup and view all the answers

    Which of the following statements accurately describes the position of Carbon-13 (C-13) in the periodic table relative to Carbon-12 (C-12)?

    <p>C-13 is placed at the same place as C-12.</p> Signup and view all the answers

    Which metal will give a white precipitate with NaOH solution, but no precipitate with NH4OH solution?

    <p>Zinc</p> Signup and view all the answers

    Which of the following electronic configurations corresponds to the MOST non-reactive element?

    <p>2</p> Signup and view all the answers

    Which of the following statements accurately represents the relationship between the assertion (A) and the reason (R)?

    Assertion (A): Halogens form uni-negative ions. Reason (R): After gaining one electron, halogens achieve an octet and stability.

    <p>Both A and R are true, and R is the correct explanation of A.</p> Signup and view all the answers

    What is the ratio between the number of atoms in 2.24 liters of Nitrogen gas (N2) and 0.4 grams of Helium gas (He)? (Atomic weight of N = 14, He = 4)

    <p>2:1</p> Signup and view all the answers

    What is the percentage purity of the impure sample of Pb3O4 used in the experiment discussed?

    <p>75%</p> Signup and view all the answers

    What is the anode reaction during the electrolysis of dilute NaCl solution using graphite electrodes?

    <p>2Cl- --&gt; Cl2 + 2e-</p> Signup and view all the answers

    What is the anode reaction during the electrolysis of sodium argentocyanide solution using Ag electrodes?

    <p>Ag --&gt; Ag+ + e-</p> Signup and view all the answers

    Which of the following is the balanced chemical equation for the preparation of methane in the laboratory?

    <p>CH3COONa + Ca(OH)2 --&gt; CH4 + CaCO3 + H2O</p> Signup and view all the answers

    Which of the following structural formulas represents a chain isomer of the organic compound with the molecular formula C4H10?

    <p>CH3CH(CH3)CH3</p> Signup and view all the answers

    Which of the following is the balanced chemical equation for the reaction of ethanol and metallic sodium?

    <p>2CH3CH2OH + 2Na --&gt; 2CH3CH2ONa + H2</p> Signup and view all the answers

    Which of the following is a reason why a graphite anode is preferred over a platinum anode during the electrolysis of molten lead bromide?

    <p>Graphite is less reactive than platinum and does not react with the products of electrolysis.</p> Signup and view all the answers

    Which of these statements about the solubility and electrical conductivity of carbon tetrachloride and sodium chloride is CORRECT?

    <p>Carbon tetrachloride is insoluble in water and does not conduct electricity, while sodium chloride is soluble in water and conducts electricity.</p> Signup and view all the answers

    What should be connected to the negative terminal of the battery?

    <p>Cathode</p> Signup and view all the answers

    Which reaction takes place at the cathode during electrolysis?

    <p>Reduction reaction</p> Signup and view all the answers

    What type of bond is formed when a metal bonds with a nonmetal?

    <p>Ionic bond</p> Signup and view all the answers

    Which of the following is a characteristic of hydrochloric acid?

    <p>It is a strong acid</p> Signup and view all the answers

    What is the kind of reaction that converts an alkyne to an alkane?

    <p>Hydrogenation reaction</p> Signup and view all the answers

    Which of the following compounds is soluble in excess ammonium hydroxide but insoluble in sodium hydroxide?

    <p>Copper hydroxide</p> Signup and view all the answers

    Which method is used to concentrate an ore containing lighter impurities?

    <p>Froth flotation</p> Signup and view all the answers

    What is an element with one electron in the valence shell likely to act as?

    <p>Reducing agent</p> Signup and view all the answers

    Study Notes

    Section A - Multiple Choice Questions

    • Question 1(i): In dilute common salt electrolysis, hydrogen is produced at the cathode due to a higher concentration of hydrogen ions than sodium ions. Sodium ions are less likely to reduce than hydrogen ions. Also, sodium is a solid and hydrogen is a gas.

    • Question 1(ii): An element reacting with hot concentrated aqueous alkali to release hydrogen is likely to be aluminium.

    • Question 1(iii): Distinguishing dilute hydrochloric acid from dilute nitric acid can be done using barium chloride solution.

    • Question 1(iv): Free electrons are responsible for electricity conduction in solutions when metal X doesn't displace hydrogen from hydrochloric acid.

    • Question 1(v): Concentrated sulphuric acid reacting with Ethanol produces a gas decolourising bromine water because it's a drying agent. Both assertions are true, and the reason correctly explains the assertion.

    • Question 1(vi): Glycerol is a non-electrolyte

    • Question 1(vii): C4H6 belongs to the homologous series of Alkynes.

    • Question 1(viii): The number of hydrogen atoms in the hydride of an element with atomic number 13 is 3.

    • Question 1(ix): Carbon-13 will be placed to the right of carbon-12 on the periodic table.

    • Question 1(x): A soluble salt of copper gives a white precipitate with NaOH but not NH4OH.

    • Question 1(xi): The electronic configuration 2,8,8,1 suits the least reactive element.

    • Question 1(xii): Halogens form uni-negative ions after gaining one electron to achieve an octet configuration and stability. Both assertion and reason are correct, and the reason explains the assertion

    • Question 2 (xiv): The catalyst used in the Haber process for ammonia production is finely divided iron.

    • Question 2 (xiii): The ratio between the number of atoms in Nitrogen gas (2.24 liters) and Helium gas (0.4g) is 3:1.

    Question 2

    • Question 2(i): Copper electrorefinement involves connecting the impure copper to the positive terminal of a battery, a copper electrode to the negative terminal, a copper(II) sulfate solution as an electrolyte, and reactions during cathode and anode. At the cathode, copper ions reduce to copper metal (Cu2+ → Cu) and at the anode, copper metal oxidizes to copper ions (Cu → Cu2+).
    • Question 2(ii): A matching of terms in column A with column B is provided (this is not a summaryable detail).

    Section B - Further Questions

    Other Questions

    • (Additional questions are present, but a complete summary of all questions is too large for a concise note.)

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    Test your understanding of electrolysis and acid-base reactions with this multiple-choice quiz. Each question explores critical concepts such as hydrogen production, element reactions, and distinguishing between acids. Perfect for refining your chemistry knowledge.

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