EASY

Earn 100

Write the reaction of potassium dichromate with hot concentrated sulphuric acid.

Important Questions on d- and f-Block Elements

MEDIUM

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

Complete and balance the following chemical equation:

$K_{2} {Cr}_{2} O_{7} + H_{2} {SO}_{4} + H_{2} S \to_____+______+______+_______$ .

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ______________.

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

Which of the following compounds is formed when a mixture of

K_{2} {Cr}_{2} O_{7}

and

NaCl

is heated with concentrated

H_{2} {SO}_{4}

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

Which of the following product is not formed when potassium dichromate reacts with cold sulphuric acid?

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

Write the reaction of potassium dichromate with cold concentrated sulphuric acid.

MEDIUM

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

When conc.

H_{2} {SO}_{4}

is added to

{KMnO}_{4}

explosion occurs. The compound formed is

MEDIUM

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

When a mixture of solid

N a C l,

solid

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

is heated with conc.

H_{2} S O_{4},

orange red vapours are obtained of the compound

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

K_{2} {Cr}_{2} O_{7}

when reacts with cold conc.

H_{2} {SO}_{4}

gives red crystal of

HARD

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

Which of the following compounds is formed when a mixture of K₂Cr₂O₇ and NaCl is heated with Conc. H₂SO₄ ?

MEDIUM

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

What is the chemistry of chromyl chloride test?

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

What happens when:

$K_{2} {Cr}_{2} O_{7}$ is heated

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

Which of the following statements(s) is (are) correct when a mixture of

NaCl

and

K_{2} {Cr}_{2} O_{7}

is gently warmed with conc.

H_{2} {SO}_{4}

HARD

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

A metallic chloride

(A)

does not respond to the chromyl chloride test. However,

(A)

gives a white precipitate with a limited amount of another metal chloride

(B)

and a grey precipitate with an excess amount of

(B)

(A)

when treated with

KI

, gives a scarlet precipitate, which dissolves in excess of

KI

forming an important reagent

(C)

used in qualitative analysis. Identify

(A), (B)

and

(C)

. Write all the reactions.

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

When potassium dichromate reacts with cold sulphuric acid, the red crystals formed are of

{CrO}_{3}

MEDIUM

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

One of the product formed when

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

reacts with conc.

H_{2} S O_{4}

in cold is

HARD

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.

(i) Cu⁺ undergoes disproportionation to Cu and Cu²⁺ in aqueous solution

(ii) Hg₂Cl₂ does not impart chromyl chloride test

(iii) Sulphide ions react with sodium nitroprusside to form a purple coloured complex. In this reaction, oxidation state of iron changes.

HARD

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

What happens when:

$K_{2} {Cr}_{2} O_{7}$ heated with $NaCl$ in presence of conc. $H_{2} {SO}_{4}$ .

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

What happens when acid is added to the yellow coloured potassium chromate solution?

MEDIUM

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

How can you convert potassium dichromate into chromyl chloride? Give equations for the reactions involved.

EASY

Chemistry>Inorganic Chemistry>d- and f-Block Elements>Potassium Dichromate

Cotyledons are also called-

Write the reaction of potassium dichromate with hot concentrated sulphuric acid.

Important Questions on d- and f-Block Elements

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