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Properties of a primary standard in titrimetric analysis

This type of question, asked 4 times: 1 Feb 2024, 9 Apr 2024, 3 Apr 2025, 22 Jan 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    1 Feb 2024

    47
    Given below are two statements: Statement (I): Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution. Statement (II): In this titration phenolphthalein can be used as indicator. In the light of the above statements, choose the most appropriate answer from the options given below:

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  2. Question 2

    9 Apr 2024

    49
    Identify the incorrect statements regarding primary standard of titrimetric analysis (A) It should be purely available in dry form. (B) It should not undergo chemical change in air. (C) It should be hygroscopic and should react with another chemical instantaneously and stoichiometrically. (D) It should be readily soluble in water. (E) KMnO4&NaOHKMnO_{4}\& NaOH can be used as primary standard. Choose the correct answer from the options given below:

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  3. Question 3

    3 Apr 2025

    106
    Compounds that should not be used as primary standards in titrimetric analysis are A. Na2Cr2O7{Na}_{2}{Cr}_{2}O_{7} B. Oxalic acid C. NaOH D. FeSO4⋅6H2O{FeSO}_{4} \cdot 6H_{2}O E. Sodium tetraborate Choose the most appropriate answer from the options given below:

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  4. Question 4

    22 Jan 2026 S2

    40
    Identify the correct statements : (A) Hydrated salts can be used as primary standard. (B) Primary standard should not undergo any reaction with air. (C) Reactions of primary standard with another substance should be instantaneous and stoichiometric. (D) Primary standard should not be soluble in water. (E) Primary standard should have low relative molar mass. Choose the correct answer from the options given below :

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