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The incorrect statement(s) :
(a) W(VI) is more stable than Cr(VI).
(b) In the presence of HCl, permanganate titrations provide satisfactory results.
(c) Some lanthanoid oxides can be used as phosphors.
(b) In the presence of HCl, permanganate titrations provide satisfactory results.
(c) Some lanthanoid oxides can be used as phosphors.
- a)(a) and (b) only
- b)(b) only
- c)(b) and (c) only
- d)(a) only
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
The incorrect statement(s) :(a) W(VI) is more stable than Cr(VI).(b) I...
Incorrect Statement(s) among (a) - (c):
(b) In the presence of HCl, permanganate titrations provide satisfactory results.
Explanation:
a) W(VI) is more stable than Cr(VI):
- The stability of a compound is determined by its thermodynamic properties.
- In the case of W(VI) and Cr(VI), W(VI) compounds are generally more stable than Cr(VI) compounds.
- This is because tungsten (W) has a higher effective nuclear charge, resulting in stronger bonding and increased stability.
- Hence, statement (a) is correct.
b) In the presence of HCl, permanganate titrations provide satisfactory results:
- Titrations involving permanganate ion (MnO4-) are widely used in analytical chemistry to determine the concentration of reducing agents.
- However, the presence of HCl can interfere with the accuracy of permanganate titrations.
- HCl is a strong reducing agent and can react with permanganate ion, leading to the premature reduction of Mn(VII) to Mn(II).
- This premature reduction can cause errors in the titration results and make them unsatisfactory.
- Hence, statement (b) is incorrect.
c) Some lanthanoid oxides can be used as phosphors:
- Lanthanoid oxides, also known as rare earth oxides, are often used as phosphors in various applications.
- Phosphors are materials that emit visible light when exposed to certain forms of energy, such as ultraviolet or electron beams.
- Lanthanoid oxides have unique electronic configurations that allow them to exhibit characteristic emission spectra.
- These emission spectra can be tuned by varying the composition and dopants, making lanthanoid oxides suitable for different applications such as fluorescent lighting, cathode ray tubes, and display technologies.
- Hence, statement (c) is correct.
Conclusion:
The incorrect statement among (a) - (c) is (b) In the presence of HCl, permanganate titrations provide satisfactory results.
(b) In the presence of HCl, permanganate titrations provide satisfactory results.
Explanation:
a) W(VI) is more stable than Cr(VI):
- The stability of a compound is determined by its thermodynamic properties.
- In the case of W(VI) and Cr(VI), W(VI) compounds are generally more stable than Cr(VI) compounds.
- This is because tungsten (W) has a higher effective nuclear charge, resulting in stronger bonding and increased stability.
- Hence, statement (a) is correct.
b) In the presence of HCl, permanganate titrations provide satisfactory results:
- Titrations involving permanganate ion (MnO4-) are widely used in analytical chemistry to determine the concentration of reducing agents.
- However, the presence of HCl can interfere with the accuracy of permanganate titrations.
- HCl is a strong reducing agent and can react with permanganate ion, leading to the premature reduction of Mn(VII) to Mn(II).
- This premature reduction can cause errors in the titration results and make them unsatisfactory.
- Hence, statement (b) is incorrect.
c) Some lanthanoid oxides can be used as phosphors:
- Lanthanoid oxides, also known as rare earth oxides, are often used as phosphors in various applications.
- Phosphors are materials that emit visible light when exposed to certain forms of energy, such as ultraviolet or electron beams.
- Lanthanoid oxides have unique electronic configurations that allow them to exhibit characteristic emission spectra.
- These emission spectra can be tuned by varying the composition and dopants, making lanthanoid oxides suitable for different applications such as fluorescent lighting, cathode ray tubes, and display technologies.
- Hence, statement (c) is correct.
Conclusion:
The incorrect statement among (a) - (c) is (b) In the presence of HCl, permanganate titrations provide satisfactory results.
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Community Answer
The incorrect statement(s) :(a) W(VI) is more stable than Cr(VI).(b) I...
- W(VI) is more stable than Cr(VI).
- Permanganate titrations in presence of HCl are unsatisfactory as HCl is oxidised to Cl2.
- Lanthanoid oxides are used as phosphors.
Hence,only statement (b) is incorrect.
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The incorrect statement(s) :(a) W(VI) is more stable than Cr(VI).(b) In the presence of HCl, permanganate titrations provide satisfactory results.(c) Some lanthanoid oxides can be used as phosphors.a)(a) and (b) onlyb)(b) onlyc)(b) and (c) onlyd)(a) onlyCorrect answer is option 'B'. Can you explain this answer?
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The incorrect statement(s) :(a) W(VI) is more stable than Cr(VI).(b) In the presence of HCl, permanganate titrations provide satisfactory results.(c) Some lanthanoid oxides can be used as phosphors.a)(a) and (b) onlyb)(b) onlyc)(b) and (c) onlyd)(a) onlyCorrect answer is option 'B'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The incorrect statement(s) :(a) W(VI) is more stable than Cr(VI).(b) In the presence of HCl, permanganate titrations provide satisfactory results.(c) Some lanthanoid oxides can be used as phosphors.a)(a) and (b) onlyb)(b) onlyc)(b) and (c) onlyd)(a) onlyCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The incorrect statement(s) :(a) W(VI) is more stable than Cr(VI).(b) In the presence of HCl, permanganate titrations provide satisfactory results.(c) Some lanthanoid oxides can be used as phosphors.a)(a) and (b) onlyb)(b) onlyc)(b) and (c) onlyd)(a) onlyCorrect answer is option 'B'. Can you explain this answer?.
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ample number of questions to practice The incorrect statement(s) :(a) W(VI) is more stable than Cr(VI).(b) In the presence of HCl, permanganate titrations provide satisfactory results.(c) Some lanthanoid oxides can be used as phosphors.a)(a) and (b) onlyb)(b) onlyc)(b) and (c) onlyd)(a) onlyCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice JEE tests.
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