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Potassium Dichromate

Zinc chromate...

Question

Zinc chromate and lead chromate are used as:

A

lakes

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B

lacquers

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C

mordants

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D

pigments

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Solution

The correct option is D pigments
Zinc Chromate (ZnCrO $_{4}$ ) and Lead Chromate (PbCrO $_{4}$ ) are used as pigments, paints, spray paints, artist paints , etc.

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Q. Assertion :For the confirmation of lead ion we first use iodide solution and then potassium chromate solution. Reason: Lead chromate has specific colour.

Q. Determine the solubilities of silver chromate, barium chromate, ferric hydroxide, lead chloride and mercurous iodide at 298 K from their solubility product constants. Determine also the molarities of individual ions.
The solubility product constants are:
Silver chromate,

1.1 \times 10^{- 12}

Barium chromate,

1.2 \times 10^{- 10}

Ferric hydroxide,

1.0 \times 10^{- 38}

Lead dichloride,

1.6 \times 10^{- 5}

Mercurous iodide,

4.5 \times 10^{- 29}

Q. Oxidation state of chromium in the precipitate of lead chromate is :

Q. Chromate and dichromate ions are:

Q. Write the balanced chemical equation when lead(II) nitrate reacts with potassium chromate.

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