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To a 10mL, 1M aqueous solution of Br(2),...

To a 10mL, 1M aqueous solution of `Br_(2)`, excess of NaOH is added so that all `Br_(2)` is disproportionated to `Br^(-)` and `BrO_(3)^(-)`. The resulting solution is free from `Br^(-)`, by extraction and excess of `OH^(-)` neutralised by acidifying the solution. The resulting solution is suffcient to react with 2 g of impure `CaC_(2)O_(4)`(M= 128g/mol) sample. The % purity of oxalate sample is :

A

`84.3%`

B

`32.5%`

C

`60%`

D

`64%`

Text Solution

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The correct Answer is:
D
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10 mL of 1.0 M aqueous solution of Br_(2) is added to excess of NaOH in order to disproportionate quantitatively to Br^(-) " and " BrO_(3)^(-) . The resulting soluting is made free from Br^(-) ion by extraction and excess of OH^(-) neutralized by acidifying the solution. This solution requires 1.5 g of an impure CaC_(2)O_(4) sample for complete redox change . Calculate % purity of CaC_(2)O_(4) sample.

36 ml 0.5M Br_(2) solution upon being made alkaline undergoes complete disproportionation into Br^(-) and BrO_(3)^(-) . The resulting solution requires 45 ml As (III) solution to reduce BrO_(3)^(-) to Br^(-) . Given that As(III) is oxidized to As(V), what is the molarity of As(III) solution ?

Knowledge Check

  • To a 10 ml, 1 M aqueous solution of Br_(2) , excess of NaOH is added so that all the Br_(2) is disproportional to Br_(2) and BrO_(3)^(-) . The resulting solution is free from Br^(-) , by extraction and excess of OH^(-) neutralised by acidifying the solution The resulting solution is sufficient to react with 2 g of impure, CaC_(2)O_(4) (M = 128 g/mol) sample The per cent purity of oxalate sample is

    A
    `85.3%`
    B
    `12.5%`
    C
    `90%`
    D
    `64%`

  • To a 10ml 1M aqueous solution of Br_(2) excess of NaOH is added so that all Br_(2) is disproportionated to Br^(-) and BrO_(3)^(-) . The resulting solution is freed from Br^(-) by extraction, and excess of OH^(-) is neutralised by acidifying the solution. The resulting solution is sufficient to react with 1.5g of impure CaC_(2)O_(4)(M = 125 g//mol) sample. Calculate \% purity of oxalate sample The relevent reactions are Br_(2)(aq) overset(OH^(-))rarr Br^(-) (aq)+ BrO_(3)^(-)(aq) BrO_(3)^(-)(aq)+C_(2)O_(4)^(2-)(aq)+rarr Br^(-)+CO_(2)

    A
    `85.3%`
    B
    `42.6%`
    C
    `63.75%`
    D
    `21.3%`

  • If 100 mL of 1NH_(2)SO_(4) is mixed with 100 mL of 1 M NaOH solution. The resulting solution will be

    A
    Highly acidic
    B
    neutral
    C
    Highly basic
    D
    Slightly acidic

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