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K2Cr2O7 versus Na2Cr2O7 as a primary standard

This type of question, asked 3 times: 10 Apr 2023, 4 Apr 2026 S1, 5 Apr 2026 S1. All 3 questions below, oldest first.

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  1. Question 1

    10 Apr 2023

    37
    Given below are two statements Statement I: Aqueous solution of K2Cr2O7K_{2}Cr_{2}O_{7} is preferred as a primary standard in volumetric analysis over Na2Cr2O7Na_{2}Cr_{2}O_{7} aqueous solution Statement II: K2Cr2O7K_{2}Cr_{2}O_{7} has a higher solubility in water than Na2Cr2O7Na_{2}Cr_{2}O_{7} In the light of the above statements, choose the correct answer from the options given below:

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  2. Question 2

    4 Apr 2026 S1

    36
    Correct statements from the following are (A) Potassium dichromate is an oxidising agent and it oxidises FeSO4{FeSO}_{4} to Fe2(SO4)3{Fe}_{2}\left( {SO}_{4} \right)_{3} in acidic medium. (B) Sodium dichromate can be used as primary standard in volumetric estimation. (C) CrO42−{CrO}_{4}^{2 -} and Cr2O72−{Cr}_{2}O_{7}^{2 -} are interconvertible in aqueous solution by varying the pH of the solution. (D) Cr−O−CrCr - O - Cr bond angle in Cr2O72−{Cr}_{2}O_{7}^{2 -} is 126∘126^{\circ}. Choose the correct answer from the options given below :

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  3. Question 3

    5 Apr 2026 S1

    45
    Statement I : Sodium dichromate and potassium dichromate are classified as primary standard in titrimetric analysis . Statement II : Phenolphthalein is a weak base; therefore it dissociates in acidic medium. In the light of the above statements, choose the correct answer from the options given below

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