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Potassium Dic...

Potassium Dichromate

Trending Questions

Q. Potassium peroxochromate

K_{3} C r O_{8}

is a red-brown paramagnetic solid prepared from the following reaction.

C r O_{4}^{2 -} + H_{2} O_{2} + O H^{-} \to [C r O_{8}]^{3 -} + H_{2} O + O_{2}

If oxidation state of

C r

in product is

X

, number of peroxide bonded

O

in product is

Y

and number of electrons in d orbital of

C r

is

Z

then what is value of

X + Y + Z

?

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Q.

$X + H^{+} ⟶ Y + N a^{+} + H_{2} O$

$Y + K C l ⟶ K_{2} C r_{2} O_{7} + N a C l$

Find X and Y.

$X = N a_{2} C r_{2} O_{7}; Y = N a_{2} C r O_{4}$
$X = N a_{2} C r_{2} O_{7}; Y = N a_{2} C r_{2} O_{7}$
$X = N a_{2} C r O_{4}; Y = N a_{2} C r_{2} O_{7}$
$X = N a_{2} C r_{2} O_{4}; Y = N a_{2} C r O_{4}$

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Q. Which of the statements is not true?

$K_{2} C r_{2} O_{7}$ solution in acidic medium is orange
$N a_{2} C r_{2} O_{7}$ is preferred over $K_{2} C r_{2} O_{7}$ in volumetric analysis
$K_{2} C r_{2} O_{7}$ solution becomes yellow on increasing the pH beyond 7
On passing $H_{2} S$ through acidified $K_{2} C r_{2} O_{7}$ solution, a milky colour is observed

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Q.

$F e C r_{2} O_{4} + N a_{2} C O_{3} + O_{2} ⟶ X + Y + C O_{2}$
Mention X and Y.

$X = N a_{2} C r O_{4}; Y = F e_{2} O_{3}$
$X = N a_{2} C r_{2} O_{7}; Y = F e_{3} O_{3}$
$X = N a_{2} C r_{2} O_{7}; Y = F e_{3} O_{4}$
$X = N a_{2} C r_{2} O_{4}; Y = F e_{3} O_{4}$

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Q. When potassium dichromate is heated with conc.

H_{2} S O_{4}

and NaCl, orange vapours are evolved due to

$C r O_{2} C l_{2}$
$C r C l_{3}$
$C l_{2}$
$C r O_{5}$

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Q. When potassium dichromate crystals are heated with conc.

H_{2} S O_{4}

, we get

Hydrogen
oxygen
Sulphur Dioxide
Hydrogen sulphide

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Q. When

K_{2} C r_{2} O_{7}

is heated with conc.

H_{2} S O_{4}

in the presence of a soluble metal chloride, orange red vapours are produced. These are due to

$C r C l_{3}$
$C r O C l_{2}$
$C r O_{2} C l_{2}$
$C r O_{4}^{2 -}$

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Q. In

C r_{2} O_{7}^{2 -}

4Cr-O bonds are equivalent
6 Cr-O bonds are equivalent
All Cr-O bonds are equivalent
All Cr-O bonds are non-equivalent

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Q. Ammonium dichromate is used in some fireworks. The green-coloured powder blown in the air is (IIT JEE, 1997)

$C r O (O_{2})$
$C r O_{3}$
$C r_{2} O_{3}$
Cr

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Q. The equilibrium :

C r_{2} O_{7}^{2 -}_{\leftarrow}^{\to} 2 C r O_{4}^{2 -}

exists in

Acidic Medium
Basic Medium
Neutral Medium
Does not exist

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