Redox Reactions Test

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Redox Reactions Test - 59

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Weekly Quiz Competition

Question 1
1 / -0

Balance the following equation and choose the quantity which is the sum of the coefficients of reactants and products:
......... $$ PtCl_4 $$ + ........... $$ XeF_4 \rightarrow PtF_{6} $$ + ....$$ClF $$ + ....$$Xe $$

A
$$16$$

B
$$13$$

C
$$18$$

D
$$12$$

Solution

Balanced reaction is
$$ PtCl_4 + 5XeF_4 \rightarrow PtF_{6} + 4ClF + 5Xe $$
$$ \therefore $$ Sum of stoichiometric coefficients
$$ = 1 + 5 + 1 + 4 + 5 = 16 $$
Question 2
1 / -0

Oxidation number of carbon in $$CH_2Cl_2$$ is:

A
$$0$$

B
$$+1$$

C
$$+2$$

D
$$+4$$

Solution

$$CH_2Cl_2$$

Let the oxidation number of C is $$x$$.

$$\to x+2(+1)+2(-1)=0$$

$$\Rightarrow x=0$$
Question 3
1 / -0

The value of coefficients to balance the following reaction are
$$Cr(OH)_3+ClO^-+OH^- \rightarrow CrO_4^{2-}+Cl^-+H_2O$$

A
$$Cr(OH)_3\ 2,\ ClO^-\ 3,\ CrO_4^{2-}\ 3,\ Cl^-\ 3$$

B
$$Cr(OH)_3\ 2,\ ClO^-\ 4,\ CrO_4^{2-}\ 3,\ Cl^-\ 2$$

C
$$Cr(OH)_3\ 2,\ ClO^-\ 4,\ CrO_4^{2-}\ 4,\ Cl^-\ 2$$

D
$$Cr(OH)_3\ 2,\ ClO^-\ 3,\ CrO_4^{2-}\ 2,\ Cl^-\ 3$$

Solution
Question 4
1 / -0

Oxidation number of iodine in $$IO_3^-, IO_4^- , KI$$ and $$I_2$$ respectively is:

A
$$-2, -5, -1, 0$$

B
$$+5,+7,-1,0$$

C
$$+2,+5,+1,0$$

D
$$-1,+1,0,+1$$

Solution

$$IO_3^- \to x+3(-2)=-1\Rightarrow x=+5$$

$$IO_4^-\to x+4(-2)=-1\Rightarrow x=+7$$

$$KI \to +1+x=0\Rightarrow x=-1$$

$$I_2 \to 0 \Rightarrow x=0$$
Question 5
1 / -0

Oxidation state of Osmium (Os) in $$ \mathrm{OsO}_{4} $$ is

A
$$ +7 $$

B
$$ +6 $$

C
$$ +4 $$

D
$$ +8 $$

Solution

$$ +8 $$
Question 6
1 / -0

The reaction, $$ 3 \mathrm{ClO}^{-}(a q) \rightarrow $$ $$ \mathrm{ClO}_{3}^{-}(a q)+2 \mathrm{Cl}^{-}(a q) $$ is an example of

A
Oxidation reaction

B
Reduction reaction

C
Disproportionation reaction

D
Decomposition reaction.

Solution

Disproportionation reaction
Question 7
1 / -0

Oxidation number of sodium in sodium amalgam is

A
$$+1 $$

B
0

C
$$-1 $$

D
$$ +2 $$

Solution

Sodium amalgam is a homogenous mixture of Na and $$ \mathrm{Hg} $$ and as such Na exists in the elemental state and hence its O.N. is zero.
Question 8
1 / -0

The oxidation number of phosphorus in $$ \mathrm{Ba}\left(\mathrm{H}_{2} \mathrm{PO}_{2}\right)_{2} \ \mathrm{is} $$

A
$$+3 $$

B
$$+2 $$

C
$$+1 $$

D
$$-1 . $$

Solution

c. $$+1 $$
Question 9
1 / -0

If a half cell reaction, $$ A+e^{-} \longrightarrow A^{-} $$ has a large negative reduction potential, it follows that

A
$$ \mathrm{A} $$ is easily reduced

B
$$A $$ is readily oxidized

C
$$ \mathrm{A}^{-} $$ is readily reduced

D
$$ \mathrm{A}^{-} $$ is readily oxidised.

Solution

$$\text{Large negative potential for the reaction, } A + e ^ { - } \rightarrow \mathrm{A}^{-} $$ implies that the reverse reaction occurs,i.e., $$ A^{-} $$ is readily oxidised.
Question 10
1 / -0

In which of the following pairs, there is the greatest difference in the oxidation number of the underlined elements?

A
$$ \underline{\mathrm{N}}O_{2} $$ and $$ \underline{\mathrm{N}_{2}} \mathrm{O}_{4} $$

B
$$ \underline{P}_{2} \mathrm{O}_{5} $$ and $$ \underline{\mathrm{P}}_{4} \mathrm{O}_{10} $$

C
$$ \underline{N}_{2} O$$ and $$ \underline{N} O$$

D
$$ \underline{\mathrm{S}} \mathrm{O}_{2} $$ and $$ \underline{\mathrm{S}}O_{3} $$

Solution

d.$$ \underline{\mathrm{S}} \mathrm{O}_{2} $$ and $$ \underline{\mathrm{S}}O_{3} $$

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Re-Attempt Weekly Quiz Competition

Redox Reactions Test - 59

Result

Redox Reactions Test - 59

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SHARING IS CARING

Question 1

$$16$$

$$13$$

$$18$$

$$12$$

Solution

Question 2

$$0$$

$$+1$$

$$+2$$

$$+4$$

Solution

Question 3

$$Cr(OH)_3\ 2,\ ClO^-\ 3,\ CrO_4^{2-}\ 3,\ Cl^-\ 3$$

$$Cr(OH)_3\ 2,\ ClO^-\ 4,\ CrO_4^{2-}\ 3,\ Cl^-\ 2$$

$$Cr(OH)_3\ 2,\ ClO^-\ 4,\ CrO_4^{2-}\ 4,\ Cl^-\ 2$$

$$Cr(OH)_3\ 2,\ ClO^-\ 3,\ CrO_4^{2-}\ 2,\ Cl^-\ 3$$

Solution

Question 4

$$-2, -5, -1, 0$$

$$+5,+7,-1,0$$

$$+2,+5,+1,0$$

$$-1,+1,0,+1$$

Solution

Question 5

$$ +7 $$

$$ +6 $$

$$ +4 $$

$$ +8 $$

Solution

Question 6

Oxidation reaction

Reduction reaction

Disproportionation reaction

Decomposition reaction.

Solution

Question 7

$$+1 $$

0

$$-1 $$

$$ +2 $$

Solution

Question 8

$$+3 $$

$$+2 $$

$$+1 $$

$$-1 . $$

Solution

Question 9

$$ \mathrm{A} $$ is easily reduced

$$A $$ is readily oxidized

$$ \mathrm{A}^{-} $$ is readily reduced

$$ \mathrm{A}^{-} $$ is readily oxidised.

Solution

Question 10

$$ \underline{\mathrm{N}}O_{2} $$ and $$ \underline{\mathrm{N}_{2}} \mathrm{O}_{4} $$

$$ \underline{P}_{2} \mathrm{O}_{5} $$ and $$ \underline{\mathrm{P}}_{4} \mathrm{O}_{10} $$

$$ \underline{N}_{2} O$$ and $$ \underline{N} O$$

$$ \underline{\mathrm{S}} \mathrm{O}_{2} $$ and $$ \underline{\mathrm{S}}O_{3} $$

Solution

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