Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 2 - Mole Concept - 2>KVPY PROBLEMS (PREVIOUS YEARS)>Q 29

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The formal oxidation number of $Cr$ and $Cl$ in the ions ${Cr}_{2} O_{7}^{2 -}$ and ${ClO}_{3}^{-},$ respectively, are:

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Important Questions on Mole Concept - 2

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 2 - Mole Concept - 2>EXERCISE>Q 1

The oxidation number of oxygen in

{Na}_{2} O_{2}

is:

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 2 - Mole Concept - 2>EXERCISE>Q 2

In

{FeCr}_{2} O_{4},

the oxidation numbers of

Fe

and

Cr

are :

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 2 - Mole Concept - 2>EXERCISE>Q 3

The oxidation number of phosphorus in

{Mg}_{2} P_{2} O_{7}

is :

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 2 - Mole Concept - 2>EXERCISE>Q 4

A reducing agent is a substance:

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 2 - Mole Concept - 2>EXERCISE>Q 5

In the reaction

2 Ag + 2 H_{2} {SO}_{4} ⟶ {Ag}_{2} {SO}_{4} + 2 H_{2} O + {SO}_{2}

, sulphuric acid acts as :

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 2 - Mole Concept - 2>EXERCISE>Q 6

Consider the following reaction:

3 {Br}_{2} + 6 {CO}_{3}^{2 -} + 3 H_{2} O ⟶ 5 {Br}^{-} + {BrO}_{3}^{-} + 6 {HCO}_{3}^{-}

. Which of the following statements is true regarding this reaction?

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 2 - Mole Concept - 2>EXERCISE>Q 7

Which of the following is a redox reaction?

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 2 - Mole Concept - 2>EXERCISE>Q 8

In which of the following reactions, is there a change in the oxidation number of nitrogen atom?