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What is the effect of increasing pH on t...

What is the effect of increasing pH on the colour of `K_(2)Cr_(2)O_(7)` solution ?

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When pH is less than 7 (acidic medium), `K_(2)Cr_(2)O_(7)(Cr_(2)O_(7)^(2-))` has orange colour. In the basic medium with pH more than 7, the colour of the solution changes to yellow due to the formation `K_(2)CrO_(4)(CrO_(4)^(2-) " ion")`.
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What is the effect of increasing pH on K_2Cr_2O_7 solution?

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  • A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowish precipitate (D). the substance (D) burns in air to produce a gas (E) which also cann change the colour of K_(2)Cr_(2)O_(7) solution. Q. "A" probably, is:

    A
    `ZnSO_(3)`
    B
    `CoS`
    C
    `MnS`
    D
    `NiS`

  • A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowish precipitate (D). the substance (D) burns in air to produce a gas (E) which also cann change the colour of K_(2)Cr_(2)O_(7) solution. Q. When "B" racts with "E":

    A
    a new gas F will be produced
    B
    It produced D and a colourless liquid
    C
    there will be no reaction between them
    D
    it yields B and an acidic oxie

  • A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowish precipitate (D). the substance (D) burns in air to produce a gas (E) which also cann change the colour of K_(2)Cr_(2)O_(7) solution. Q. Which is not correct about E ?

    A
    It is colourless and highly water soluble
    B
    The molecule is linear
    C
    Its aqueous solution acidic
    D
    it turns starch iodate paper blue
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