Some Important Compounds of Transition Metals

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Some Important Compounds of Transition Metals: Overview

This topic covers concepts, such as, Important Compounds of d-Block Elements, Potassium Dichromate, Reaction of K2Cr2O7 with Conc. Cold H2SO4 & Reaction of K2Cr2O7 with Conc. Heated H2SO4 etc.

Important Questions on Some Important Compounds of Transition Metals

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

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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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The solution of potassium dichromate is prepared from which of the following compound and how its colour changes with change in pH:

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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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The following steps are involved in the manufacturing of potassium dichromate:

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What is the difference in the oxidation number of Cr between X and Y?

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

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

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

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

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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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What is the melting point of potassium dichromate?

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

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Which of the following statements is/are false?

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A solution of KMnO4 is reduced to various products depending upon its pH.

I. At pH<7, it is reduced to a colourless solution (A).

II. At pH=7, it forms a brown precipitate (B).

III. At pH>7, it gives a green solution (C).

Then A, B and C, respectively are

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Which of the following sodium salts, on heating with solid  K2Cr2O7  and concentrated H2SO4, gives red vapour?

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

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How many peroxy linkages are present in CrO5 ?

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

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2MnO2 + 4KOH + O2  _____+ 2H2O3MnO42- + 4H+  2MnO4-  +_____  + 2H2O
The above reactions give us permanganate ion from potassium oxide. The no. of manganese dioxide in the product side for both the reactions are: