Virtual Labs

Potentiometric titration of a strong acid and strong base.

Which of the following is a disadvantage of potentiometric titration?

a: Turbid, fluorescent, opaque, or colored solutions can be titrated. Explanation

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b: The results are very accurate. Explanation

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c: Mixtures of very diluted solutions can be titrated. Explanation

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d: It is extremely pH sensitive. Explanation

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Q2. Which of the following is an inappropriate use of an acid-base titration curve?

a: To select a suitable primary standard for the titration. Explanation

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b: To determine the concentration of the base. Explanation

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c: To determine whether the acid is weak or strong. Explanation

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d: To select a suitable indicator for titration. Explanation

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Q3. Which of the following reference electrodes is not suitable for the electrochemical analysis at a temperature above 80⁰C?

a: Silver-silver chloride electrode. Explanation

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b: Calomel electrode. Explanation

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c: Either silver-silver chloride electrode or calomel electrode. Explanation

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d: Neither silver-silver chloride electrode nor calomel electrode. Explanation

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Q4. Which of the following is a requirement of an indicator in potentiometric titration?

a: An equivalence point that is close to the stoichiometric point. Explanation

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b: Distinct color change. Explanation

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c: The ability to change from colorless to pink. Explanation

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d: A transition point that is close to the equivalence point. Explanation

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Q5. What is the use of quinhydrone ?

a: To determine the hydrogen ion concentration or the pH of a solution. Explanation

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b: Acts as an indicator. Explanation

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c: Finds equivalent point. Explanation

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d: Finds transition point. Explanation

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Q6. Non-aqueous titration is usually carried out for which of the following?

a: Weakly acidic drug. Explanation

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b: Weakly basic drug. Explanation

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c: Water insoluble drug. Explanation

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d: All the above. Explanation

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Q7. An electrode whose potential depends on H⁺ ion concentration can be used as____________

a: A reference electrode. Explanation

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b: An indicator electrode. Explanation

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c: Both. Explanation

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d: None. Explanation

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Q8. In a strong acid-base titration, the pH of a mixture at the initial stage is calculated by:-

a: [OH^-] = NbVb - NaVa / (Va + Vb) Explanation

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b: pOH = -log[OH^-] Explanation

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c: pH = -log[H⁺]. Explanation

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d: [H⁺] = NaVa-NbVb / (Va+Vb) Explanation

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