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An orange solid (A) on heating gave a gr...

An orange solid `(A)` on heating gave a green residue `(B)`, colourless gas `( C)` and water vapour. The dry gas `( C)` on passing over heated magnesium gave a white solid `(D).(D)` on reaction with water have a gas `( E)` which formed dense white fumes with `HCl`. Indentify `(A)` to `( E)` and give the reactions.

A

sodium dichromate

B

potassium dichromate

C

potassium chromate

D

ammonium dichromate.

Text Solution

Verified by Experts

The correct Answer is:
D
Orange solid is ammonium dichromate i.e., `(NH_(4))_(2)Cr_(2)O_(7)`.
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An orange solid (A) on heating gives a green residue (B), a colourless gas (C ) and water vapours. The dry gas (C ) on passing over heated Mg gave a white solid (D). (D) on reaction with water gave a gas (E) which formed black preciptate with mercurous nitrate solution. The green residue (B) is :

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Knowledge Check

  • An orange solid (A) on heating gave a green residue (B), a colourless gas (C ) and water vapours. The dry gas (C ) when passed over heated magnesium, gave a white solid (D) which evolved a gas (E ) on reacting with water. The gas formed dense white fumes with HCl. Identify all the compounds from A to E. Give the reactions involved. The white solid (D) is :

    A
    MgO
    B
    `MgSO_(4)`
    C
    `MgCl_(2)`
    D
    `Mg_(2)N_(3)`

  • An orange solid (A) on heating gave a green residue (B), a colourless gas (C ) and water vapours. The dry gas (C ) when passed over heated magnesium, gave a white solid (D) which evolved a gas (E ) on reacting with water. The gas formed dense white fumes with HCl. Identify all the compounds from A to E. Give the reactions involved. The green residue (B) has the formula

    A
    `CrO_(5)`
    B
    `CrO_(3)`
    C
    `Cr_(2)O_(5)`
    D
    `CrO_(2)`

  • An orange solid (A) on heating gives a green residue (B), a colourless gas (C ) and water vapours. The dry gas (C ) on passing over heated Mg gave a white solid (D). (D) on reaction with water gave a gas (E) which formed black preciptate with mercurous nitrate solution. The green residue (B) is :

    A
    amphoteric in nature.
    B
    used as green pigment.
    C
    used in fire crackers to impart the red colour.
    D
    (A) and (B) both.
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