Redox Reactions Test

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Redox Reactions Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

The brown ring complex compound is formulated as $$[Fe(H_{2}O)_{5}(NO)]SO_{4}$$. The oxidation state of iron in this complex is:

A
$$0$$

B
$$+1$$

C
$$+2$$

D
$$+3$$
Question 2
1 / -0

In which of the following, iron is present in its lowest oxidation state?

A
$$FeSO_{4}.7H_{2}O$$

B
$$Fe(CO)_{5}$$

C
$$Fe_{0.94}O$$

D
$$Fe_{3}O_{4}$$

Solution

The oxidation state of iron in iron pentacarbonyl is $$0$$.

In all other compounds, iron has a positive oxidation state.

Thus, $$Fe(CO)_5$$ has the lowest oxidation state of iron.
Question 3
1 / -0

Oxidation state of iron in $$Na_{2}[Fe(CN)_{5}(NO)]$$ is:

A
$$+1$$

B
$$+2$$

C
$$0$$

D
$$+3$$

Solution

Let $$x$$ be the oxidation number of $$Fe$$.
The oxidation numbers of $$Na^+, \:CN^-$$, $$NO$$ and are $$+1, \: -1,\: 0$$ respectively.
The sum of the oxidation numbers is zero.
Hence, $$2(+1)+x+5(-1)+0=0$$ or $$x=+3$$.
Thus, the oxidation state of iron in $$Na_2[Fe(CN)_5(NO)]$$ is $$+3$$.
Question 4
1 / -0

The oxidation state of phosphorus is maximum in_________.

A
phospine $$(PH_{3})$$

B
diphosphine $$(P_{2}H_{4})$$

C
metaphosphoric acid $$(HPO_{3})$$

D
phosphorus acid $$(H_{3}PO_{3})$$

Solution

The oxidation states of phosphorus in phosphine, diphosphine, metaphosphoric acid and phosphorus acid are $$-3,-2,+5$$ and $$+3 $$ respectively. Hence, it is maximum in metaphosphoric acid.
Question 5
1 / -0

Consider the following reaction:
$$6NaOH +3Cl_{2} \rightarrow 5NaCl +A+ 3H_{2}O$$

What is the oxidation number of chlorine in $$A$$?

A
$$+5$$

B
$$-1$$

C
$$+3$$

D
$$+1$$

Solution

Balancing the above equation, the formula of $$A$$ is $$NaClO_3$$.

Since, $$Na$$ is highly electropositive, it has an oxidation number of $$+1$$.

Hence, the $$ClO_3$$ group has an oxidation number of $$-1$$.

We also know that the oxidation number of oxygen in $$ClO_3$$ is $$-2$$, since it is more electronegative than chlorine.

Let the oxidation number of $$Cl$$ in $$ClO_3$$ be $$x$$.

Therefore,
$$x-3(2)=-1$$
or, $$x-6=-1$$
Therefore, $$x=+5$$

The oxidation number of $$Cl$$ in $$NaClO_3$$ be $$+5$$.
Question 6
1 / -0

The oxidation state of oxygen is maximum in_________.

A
bleaching powder $$(CaOCl_{2})$$

B
oxygen difluoride $$(OF_{2})$$

C
dioxygen difluoride $$(O_{2}F_{2})$$

D
hydrogen peroxide $$(H_{2}O_{2})$$

Solution

The oxidation states of oxygen in bleaching powder, oxygen difluoride, dioxygen difluoride and hydrogen peroxide are $$0,\: 2,\: 1$$ and $$-1$$ respectively. Hence, it is maximum in $$OF_2$$.
Question 7
1 / -0

Oxidation state of nitrogen is not an integer in:

A
hydroxyl amine $$(NH_{2}OH)$$

B
ammonia $$(NH_{3})$$

C
hydrazine $$(N_{2}H_{4})$$

D
hydrazoic acid $$(N_{3}H)$$

Solution

In $$N_3H$$, the oxidation state of $$N$$ is $$-\dfrac{1}{3}$$. Hence, it is not an integer.

The oxidation state of $$N$$ in $$NH_2OH$$, $$NH_3$$ and $$N_2H_4$$ are $$-1,\:-3$$ and $$-2$$ respectively.
Question 8
1 / -0

Oxidation state of molybdenum in $$Mo_{2}Cl_{8}^{4-}$$ ion is:

A
$$+4$$

B
$$-4$$

C
$$+1$$

D
$$+2$$

Solution

Let the oxidation state of molybdenum in $$Mo_2Cl^{4-}_8$$ be $$x$$.
Therefore, $$2x - 8= -4 \implies x =+2$$.

So, the oxidation state of $$Mo$$ is +2.
Correct option is 'D'
Question 9
1 / -0

The oxidation state of the metal atom is zero in:

A
ferrous sulphate

B
ferric sulphate

C
rust

D
iron carbonyl

Solution

In iron carbonyl, the oxidation state of metal is zero. In all other given compounds, metal has positive oxidation state.
Question 10
1 / -0

The oxidation number of chlorine is maximum in __________.

A
$$HOCl$$

B
$$Cl_{2}O_{6}$$

C
$$KClO_{4}$$

D
$$NaClO_{3}$$

Solution

The oxidation numbers of chlorine in $$HOCl$$, $$Cl_2O_6, KClO_4$$ and $$NaClO_3$$ are $$+1,\: +6,\: +7$$ and $$+5$$ respectively. Hence, the oxidation number of chlorine is maximum in $$KClO_4$$.

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Re-Attempt Weekly Quiz Competition

Redox Reactions Test - 14

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Redox Reactions Test - 14

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Question 1

$$0$$

$$+1$$

$$+2$$

$$+3$$

Question 2

$$FeSO_{4}.7H_{2}O$$

$$Fe(CO)_{5}$$

$$Fe_{0.94}O$$

$$Fe_{3}O_{4}$$

Solution

Question 3

$$+1$$

$$+2$$

$$0$$

$$+3$$

Solution

Question 4

phospine $$(PH_{3})$$

diphosphine $$(P_{2}H_{4})$$

metaphosphoric acid $$(HPO_{3})$$

phosphorus acid $$(H_{3}PO_{3})$$

Solution

Question 5

$$+5$$

$$-1$$

$$+3$$

$$+1$$

Solution

Question 6

bleaching powder $$(CaOCl_{2})$$

oxygen difluoride $$(OF_{2})$$

dioxygen difluoride $$(O_{2}F_{2})$$

hydrogen peroxide $$(H_{2}O_{2})$$

Solution

Question 7

hydroxyl amine $$(NH_{2}OH)$$

ammonia $$(NH_{3})$$

hydrazine $$(N_{2}H_{4})$$

hydrazoic acid $$(N_{3}H)$$

Solution

Question 8

$$+4$$

$$-4$$

$$+1$$

$$+2$$

Solution

Question 9

ferrous sulphate

ferric sulphate

rust

iron carbonyl

Solution

Question 10

$$HOCl$$

$$Cl_{2}O_{6}$$

$$KClO_{4}$$

$$NaClO_{3}$$

Solution

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