Pradeep's New Course CHEMISTRY Vol.II>Chapter 8 - Redox Reactions>TEST YOUR GRIP>Q 4

MEDIUM

11th CBSE

IMPORTANT

Earn 100

${CrO}_{5}$ has structure as shown:

The oxidation number of chromium in the above compound is

60.98% studentsanswered this correctly

Important Questions on Redox Reactions

MEDIUM

11th CBSE

IMPORTANT

Pradeep's New Course CHEMISTRY Vol.II>Chapter 8 - Redox Reactions>TEST YOUR GRIP>Q 5

The reaction,

P_{4} + 3 NaOH + 3 H_{2} O \to 3 {NaH}_{2} {PO}_{2} + {PH}_{3}

is an example of

EASY

11th CBSE

IMPORTANT

Pradeep's New Course CHEMISTRY Vol.II>Chapter 8 - Redox Reactions>TEST YOUR GRIP>Q 6

When

{KMnO}_{4}

acts as an oxidizing agent and ultimately forms

{MnO}_{4}^{2 -}

,

{MnO}_{2}

,

{Mn}_{2} O_{3}

and

{Mn}^{2 +}

, then the number of electrons transferred in each case respectively is

HARD

11th CBSE

IMPORTANT

Pradeep's New Course CHEMISTRY Vol.II>Chapter 8 - Redox Reactions>TEST YOUR GRIP>Q 7

In the given reaction,

K_{2} {Cr}_{2} O_{7} + {XH}_{2} {SO}_{4} + {YSO}_{2} \to K_{2} {SO}_{4} + {Cr}_{2} {({SO}_{4})}_{3} + {ZH}_{2} O

X, Y, Z

are?

MEDIUM

11th CBSE

IMPORTANT

Pradeep's New Course CHEMISTRY Vol.II>Chapter 8 - Redox Reactions>TEST YOUR GRIP>Q 8

The values of

x

and

y

in the following redox reaction,

x {Cl}_{2} + 6 {OH}^{-} \to {ClO}_{3}^{-} + y {Cl}^{-} + 3 H_{2} O

are:

EASY

11th CBSE

IMPORTANT

Pradeep's New Course CHEMISTRY Vol.II>Chapter 8 - Redox Reactions>TEST YOUR GRIP>Q 9

A standard hydrogen electrode has zero electrode potential because

EASY

11th CBSE

IMPORTANT

Pradeep's New Course CHEMISTRY Vol.II>Chapter 8 - Redox Reactions>TEST YOUR GRIP>Q 10

If the half cell reactions are given as
(i)

{Fe}^{2 +} (aq) + 2 e^{-} \to Fe (s); E ° = - 0 .44 V

(ii)

2 H^{+} (aq) + \frac{1}{2} O_{2} (g) + 2 e^{-} \to H_{2} O (l); E ° = + 1 .23 V

The

E °

for the reaction (In Volts),

Fe (s) + 2 H^{+} (aq) + \frac{1}{2} O_{2} (g) \to {Fe}^{2 +} (aq) + H_{2} O (l)

is

EASY

11th CBSE

IMPORTANT

Pradeep's New Course CHEMISTRY Vol.II>Chapter 8 - Redox Reactions>TEST YOUR GRIP>Q 2

The compound ${YbBa}_{2} {Cu}_{3} O_{7}$ which shows superconductivity, has copper in oxidation state _____ $(- \frac{7}{3} / + \frac{7}{3})$ . Assume that the rare earth element ytterbium is in the usual $+ 3$ oxidation state.

EASY

11th CBSE

IMPORTANT

Pradeep's New Course CHEMISTRY Vol.II>Chapter 8 - Redox Reactions>TEST YOUR GRIP>Q 5

When the oxidation number of an element is maximum, it can act only as _____. (Reducing agent/Oxidizing agent)