ISC XII Chemistry Competency Questions
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Questions and Answers

Which vitamin deficiency causes rickets?

  • Vitamin A
  • Vitamin B
  • Vitamin C
  • Vitamin D (correct)

    • All vitamins are soluble in water.

    False

    What is avitaminosis?

    Avitaminosis is a condition caused by the deficiency of one or more vitamins in the body, leading to various health problems.

    The process of ______ is used in the medical field to regulate fluid movement across cell membranes.

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

    What method is used to prevent corrosion on ships?

    <p>Cathodic Protection</p> Signup and view all the answers

    Match the following applications with their corresponding processes.

    <p>Desalination = Reverse Osmosis Salt clumping prevention = Sodium ferrocyanide Preventing phosgene formation in chloroform = Adding C2H6O Fluid movement across cell membranes = Osmosis</p> Signup and view all the answers

    What is the chemical formula of phosgene?

    <p>COCl2</p> Signup and view all the answers

    Chloroform is used as an ______ in medicine.

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

    Which statement about electrophilic substitution reactions in haloarenes is correct?

    <p>Both Assertion (A) and Reason (R) are correct, but Reason (R) is not the correct explanation of Assertion (A).</p> Signup and view all the answers

    Benzaldehyde nitration produces only ortho nitrobenzaldehyde.

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

    What effect does the -CHO group have on the reactivity of benzaldehyde in electrophilic nitration?

    <p>-I effect</p> Signup and view all the answers

    The half-life of a __________ reaction does not depend on the initial concentration of the reactant.

    <p>first order</p> Signup and view all the answers

    Match the following concepts with their descriptions:

    <p>-CHO group = Exhibits -I effect Electrophilic substitution = Occurs at ortho and para positions First order reactions = Half-life independent of reactant concentration Inductive effect = Electron withdrawing effect</p> Signup and view all the answers

    Why is the yield of para-substituted haloarenes generally favored?

    <p>Resonance stabilization predominates for para products.</p> Signup and view all the answers

    Ethanol is more acidic than water due to the electron releasing effect of the ethyl group.

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

    What is the reason that the half-life of a first order reaction does not depend on initial concentration?

    <p>The expression for half-life is independent of concentration.</p> Signup and view all the answers

    What does Kohlrausch's conclusion about specific conductivity imply?

    <p>It is unique for each type of ion regardless of its source.</p> Signup and view all the answers

    Kohlrausch's law is applicable to both strong and weak electrolytes.

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

    What is an example of a weak electrolyte mentioned in the content?

    <p>Acetic acid</p> Signup and view all the answers

    Kohlrausch concluded that each type of migrating ion has a specific __________.

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

    Match the following terms with their descriptions:

    <p>Strong electrolytes = Ions that dissociate completely in solution Weak electrolytes = Ions that partially dissociate in solution Specific conductivity = Unique conductivity for each ion regardless of source Kohlrausch's law = A principle relating conductivity to concentration</p> Signup and view all the answers

    How can molar conductivity of acetic acid be calculated according to Kohlrausch's law?

    <p>By multiplying its specific conductivity by its molar concentration.</p> Signup and view all the answers

    Conductivity of ions is influenced by their origin according to Kohlrausch.

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

    What major observation did Kohlrausch make regarding weak electrolytes?

    <p>More complex behavior compared to strong electrolytes.</p> Signup and view all the answers

    What is hydroboration-oxidation primarily used for in organic chemistry?

    <p>Converting alkenes to alcohols</p> Signup and view all the answers

    The presence of 3-nitrophenol makes it a stronger acid than phenol.

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

    What reagent can be used to convert chloropropane to propan-2-ol?

    <p>Soda lime</p> Signup and view all the answers

    The ____ factor indicates the degree of dissociation of solute particles in solution.

    <p>Van't Hoff</p> Signup and view all the answers

    Match the following compounds with their properties:

    <p>Phenol = Weak acid 4-methyl phenol = Less acidic than phenol 3-nitrophenol = Stronger acid than phenol Ethanol = Neutral alcohol</p> Signup and view all the answers

    What is the result of applying pressure to a compartment containing a solvent in an osmosis experiment?

    <p>Stops the flow of solvent</p> Signup and view all the answers

    Barium chloride dissociates completely in solution, resulting in a Van't Hoff factor greater than 3.

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

    What is the boiling point elevation of a solution containing naphthalene?

    <p>0.30 K</p> Signup and view all the answers

    Which statement correctly explains why [𝐹𝐹𝐹𝐹(𝐻𝐻2 𝑂𝑂)6 ]2+ is strongly attracted to a magnet compared to [𝐹𝐹𝐹𝐹(𝐶𝐶𝐶𝐶)6 ]4−?

    <p>[𝐹𝐹𝐹𝐹(𝐻𝐻2 𝑂𝑂)6 ]2+ is an inner orbital complex.</p> Signup and view all the answers

    Toluene reacts with chromyl chloride in 𝐶𝐶𝐶𝐶𝐶𝐶4 to give a compound that shows a yellow precipitate of iodoform.

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

    What is the order of reaction if a student observes a parallel line with the X-axis in a plot of rate against concentration?

    <p>Zero order</p> Signup and view all the answers

    In nucleophilic substitution reactions, the most reactive compound from the following is ______.

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

    Which compound is least reactive towards nucleophilic substitution?

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

    A slow reaction will produce a negative slope in the rate vs concentration graph.

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

    Match the compounds with their respective behaviors in nucleophilic substitution:

    <p>Acetone = Least reactive Benzaldehyde = Moderately reactive Formaldehyde = Most reactive Acetophenone = Least reactive</p> Signup and view all the answers

    Which compound shown below is likely to yield a brick red precipitate with Fehling's solution?

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

    Study Notes

    ISC XII Chemistry, Competency-Focused Practice Questions

    • These practice questions are for ISC Class XII Chemistry, Paper 1-Theory.
    • They focus on competency-based education, going beyond rote memorization to develop critical thinking and problem-solving skills.
    • The questions cover various topics in chemistry, including multiple choice questions, assertion-reason questions, fill-in-the-blank questions, very short answer questions, short answer questions, long answer questions, and answer keys, all designed for higher order thinking.
    • The questions are accompanied by the relevant topic and cognitive learning domains they address, like understanding, analysis, application, evaluation, and creativity.

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    ISC Chemistry XII Practice Questions PDF 2024

    Description

    This quiz features competency-based practice questions for ISC Class XII Chemistry, focusing on critical thinking and problem-solving. It includes multiple types of questions designed to enhance understanding and application of various chemistry topics. Ideal for students aiming to deepen their knowledge and prepare effectively for their exams.

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