Some Important Compounds of Transition Metals

IMPORTANT

Some Important Compounds of Transition Metals: Overview

This topic covers concepts, such as Important Compounds of d-Block Elements, Potassium Dichromate, Preparation of Potassium Dichromate, pH Dependent Equilibrium between Dichromate and Chromate Ions, Potassium Permanganate, etc.

Important Questions on Some Important Compounds of Transition Metals

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 1

A compound which is a strong oxidizing agent and has orange coloured crystal. It is used in the preparation of azo compounds. Identify the compound:

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 2

On oxidation of S2O32− by MnO4−  in neutral aqueous medium, the oxidation number of S would change from:

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 3

On complete oxidation of   Fe 2+  by  Cr 2 O 7 2−  in acidic medium, the oxidation state of Cr will change from:

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 4

The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is:

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 5

When K2Cr2O7 crystals are heated with conc. HCl, the gas evolved is

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 6

In the dichromate ion

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 7

The purple colour of permanganate ion is due to

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 8

When a manganous salt is treated with KMnO4​ in alkaline medium, the oxidation number if Mn changes from +2 to:

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 9

What is the colour change when solid potassium dichromate is heated with concentrated sulphuric acid?

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 10

Solid potassium dichromate when heated with concentrated sulphuric acid gives which of the following product?

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 11

K2Cr2O7  when reacts with cold conc. H2SO4 gives red crystal of

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 12

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

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 13

The fusion of chromite ore FeCr2O4 with Na2CO3 in air gives a yellow solution upon addition of water. Subsequent treatment with H2SO4 produces an orange solution. The yellow and orange colours, respectively, are due to the formation of

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 14

When thiosulphate ion is oxidised by iodine, which one of the following ion is produced?
 

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 15

What is the melting point of potassium dichromate?

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 16

Which of the following statements is correct about tetrahedral manganate and permanganate ions?

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 17

Which of the following species has oxygen in -1 oxidation state?

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 18

How many peroxy linkages are present in CrO5 ?

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 19

Treatment of alkaline KMnO4 solution with KI solution oxidizes iodide to:-

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Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals> Q 20

During oxidation of ferrous sulphate using mixture of dilute H2SO4 and potassium dichromate, oxidation state of chromium changes from