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CHXI08:REDOX REACTIONS

315248 Oxidation number of $Fe$ in ${[Fe (CN)_{6}]}^{- 3}$ ,
${[Fe (CN)_{6}]}^{- 4}, {[Fe (SCN)_{1}]}^{+ 2}$ and ${[Fe {(H_{2} O)}_{6}]}^{+ 3}$ respectively would be

1

+ 3, + 2, + 3

and +3

2

+ 3, + 3, + 3

and +3

3

+ 3, + 2, + 2

and +2

4

+ 2, + 2, + 2

and +2

Explanation:

Oxidation number of $Fe$ in
$\begin{matrix} F i r s t & S e c o n d & T h i r d & F o u r t h \\ x - 6 = - 3 & x - 6 = - 4 & x = + 3 & x + 0 = + 3 \\ x + 6 \times 0 = + 3 & x = + 2 & x = + 3 & x = + 3 \end{matrix}$

CHXI08:REDOX REACTIONS

315249 In which among the following compounds, oxidation number of nitrogen is +5 ?

1

N_{2} O

2

N_{2} O_{3}

3

{NO}_{2}

4

{HNO}_{3}

Explanation:

Oxidation number of nitrogen is +5 in ${HNO}_{3}$ .
$1 + x + 3 (- 2) = 0$
$x - 5 = 0$
$x = + 5$

MHTCET - 2019

CHXI08:REDOX REACTIONS

315250 On combustion of ${CH}_{4}$ to ${CO}_{2}$ and $H_{2} O$ , the oxidation number of carbon changes by:

1 8

2 Zero

3 4

4 3

Explanation:

$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$
Oxidation No. of C in $C H_{4} = - 4$
Oxidation No. of C in $C O_{2} = + 4$
Thus, the change in oxidation No. $= 4 - (- 4) = 8$ .

CHXI08:REDOX REACTIONS

315251 Which of the following is correctly matched?
supporting img

1 A - P, B - Q, C - R, D - S

2 A - S, B - R, C - Q, D - P

3 A - S, B - R, C - P, D - Q

4 A - P, B - Q, C - S, D - R

Explanation:

${AlF}_{3} \to x + 3 (- 1) = 0 \Rightarrow x = + 3$
$P_{4} O_{10} \Rightarrow 4 x + 10 (- 2) = 0$
$\Rightarrow x = + 5$
${HClO}_{4} : + 1 + x + 4 (- 2) = 0$
$\Rightarrow x = + 7$
$\underset{―}{S_{4}} O_{6}^{- 2} : 4 x + 6 (- 2) = - 2$
$x = + 2.5$

CHXI08:REDOX REACTIONS

315248 Oxidation number of $Fe$ in ${[Fe (CN)_{6}]}^{- 3}$ ,
${[Fe (CN)_{6}]}^{- 4}, {[Fe (SCN)_{1}]}^{+ 2}$ and ${[Fe {(H_{2} O)}_{6}]}^{+ 3}$ respectively would be

1

+ 3, + 2, + 3

and +3

2

+ 3, + 3, + 3

and +3

3

+ 3, + 2, + 2

and +2

4

+ 2, + 2, + 2

and +2

Explanation:

Oxidation number of $Fe$ in
$\begin{matrix} F i r s t & S e c o n d & T h i r d & F o u r t h \\ x - 6 = - 3 & x - 6 = - 4 & x = + 3 & x + 0 = + 3 \\ x + 6 \times 0 = + 3 & x = + 2 & x = + 3 & x = + 3 \end{matrix}$

CHXI08:REDOX REACTIONS

315249 In which among the following compounds, oxidation number of nitrogen is +5 ?

1

N_{2} O

2

N_{2} O_{3}

3

{NO}_{2}

4

{HNO}_{3}

Explanation:

Oxidation number of nitrogen is +5 in ${HNO}_{3}$ .
$1 + x + 3 (- 2) = 0$
$x - 5 = 0$
$x = + 5$

MHTCET - 2019

CHXI08:REDOX REACTIONS

315250 On combustion of ${CH}_{4}$ to ${CO}_{2}$ and $H_{2} O$ , the oxidation number of carbon changes by:

1 8

2 Zero

3 4

4 3

Explanation:

$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$
Oxidation No. of C in $C H_{4} = - 4$
Oxidation No. of C in $C O_{2} = + 4$
Thus, the change in oxidation No. $= 4 - (- 4) = 8$ .

CHXI08:REDOX REACTIONS

315251 Which of the following is correctly matched?
supporting img

1 A - P, B - Q, C - R, D - S

2 A - S, B - R, C - Q, D - P

3 A - S, B - R, C - P, D - Q

4 A - P, B - Q, C - S, D - R

Explanation:

${AlF}_{3} \to x + 3 (- 1) = 0 \Rightarrow x = + 3$
$P_{4} O_{10} \Rightarrow 4 x + 10 (- 2) = 0$
$\Rightarrow x = + 5$
${HClO}_{4} : + 1 + x + 4 (- 2) = 0$
$\Rightarrow x = + 7$
$\underset{―}{S_{4}} O_{6}^{- 2} : 4 x + 6 (- 2) = - 2$
$x = + 2.5$

CHXI08:REDOX REACTIONS

315248 Oxidation number of $Fe$ in ${[Fe (CN)_{6}]}^{- 3}$ ,
${[Fe (CN)_{6}]}^{- 4}, {[Fe (SCN)_{1}]}^{+ 2}$ and ${[Fe {(H_{2} O)}_{6}]}^{+ 3}$ respectively would be

1

+ 3, + 2, + 3

and +3

2

+ 3, + 3, + 3

and +3

3

+ 3, + 2, + 2

and +2

4

+ 2, + 2, + 2

and +2

Explanation:

Oxidation number of $Fe$ in
$\begin{matrix} F i r s t & S e c o n d & T h i r d & F o u r t h \\ x - 6 = - 3 & x - 6 = - 4 & x = + 3 & x + 0 = + 3 \\ x + 6 \times 0 = + 3 & x = + 2 & x = + 3 & x = + 3 \end{matrix}$

CHXI08:REDOX REACTIONS

315249 In which among the following compounds, oxidation number of nitrogen is +5 ?

1

N_{2} O

2

N_{2} O_{3}

3

{NO}_{2}

4

{HNO}_{3}

Explanation:

Oxidation number of nitrogen is +5 in ${HNO}_{3}$ .
$1 + x + 3 (- 2) = 0$
$x - 5 = 0$
$x = + 5$

MHTCET - 2019

CHXI08:REDOX REACTIONS

315250 On combustion of ${CH}_{4}$ to ${CO}_{2}$ and $H_{2} O$ , the oxidation number of carbon changes by:

1 8

2 Zero

3 4

4 3

Explanation:

$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$
Oxidation No. of C in $C H_{4} = - 4$
Oxidation No. of C in $C O_{2} = + 4$
Thus, the change in oxidation No. $= 4 - (- 4) = 8$ .

CHXI08:REDOX REACTIONS

315251 Which of the following is correctly matched?
supporting img

1 A - P, B - Q, C - R, D - S

2 A - S, B - R, C - Q, D - P

3 A - S, B - R, C - P, D - Q

4 A - P, B - Q, C - S, D - R

Explanation:

${AlF}_{3} \to x + 3 (- 1) = 0 \Rightarrow x = + 3$
$P_{4} O_{10} \Rightarrow 4 x + 10 (- 2) = 0$
$\Rightarrow x = + 5$
${HClO}_{4} : + 1 + x + 4 (- 2) = 0$
$\Rightarrow x = + 7$
$\underset{―}{S_{4}} O_{6}^{- 2} : 4 x + 6 (- 2) = - 2$
$x = + 2.5$

CHXI08:REDOX REACTIONS

315248 Oxidation number of $Fe$ in ${[Fe (CN)_{6}]}^{- 3}$ ,
${[Fe (CN)_{6}]}^{- 4}, {[Fe (SCN)_{1}]}^{+ 2}$ and ${[Fe {(H_{2} O)}_{6}]}^{+ 3}$ respectively would be

1

+ 3, + 2, + 3

and +3

2

+ 3, + 3, + 3

and +3

3

+ 3, + 2, + 2

and +2

4

+ 2, + 2, + 2

and +2

Explanation:

Oxidation number of $Fe$ in
$\begin{matrix} F i r s t & S e c o n d & T h i r d & F o u r t h \\ x - 6 = - 3 & x - 6 = - 4 & x = + 3 & x + 0 = + 3 \\ x + 6 \times 0 = + 3 & x = + 2 & x = + 3 & x = + 3 \end{matrix}$

CHXI08:REDOX REACTIONS

315249 In which among the following compounds, oxidation number of nitrogen is +5 ?

1

N_{2} O

2

N_{2} O_{3}

3

{NO}_{2}

4

{HNO}_{3}

Explanation:

Oxidation number of nitrogen is +5 in ${HNO}_{3}$ .
$1 + x + 3 (- 2) = 0$
$x - 5 = 0$
$x = + 5$

MHTCET - 2019

CHXI08:REDOX REACTIONS

315250 On combustion of ${CH}_{4}$ to ${CO}_{2}$ and $H_{2} O$ , the oxidation number of carbon changes by:

1 8

2 Zero

3 4

4 3

Explanation:

$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$
Oxidation No. of C in $C H_{4} = - 4$
Oxidation No. of C in $C O_{2} = + 4$
Thus, the change in oxidation No. $= 4 - (- 4) = 8$ .

CHXI08:REDOX REACTIONS

315251 Which of the following is correctly matched?
supporting img

1 A - P, B - Q, C - R, D - S

2 A - S, B - R, C - Q, D - P

3 A - S, B - R, C - P, D - Q

4 A - P, B - Q, C - S, D - R

Explanation:

${AlF}_{3} \to x + 3 (- 1) = 0 \Rightarrow x = + 3$
$P_{4} O_{10} \Rightarrow 4 x + 10 (- 2) = 0$
$\Rightarrow x = + 5$
${HClO}_{4} : + 1 + x + 4 (- 2) = 0$
$\Rightarrow x = + 7$
$\underset{―}{S_{4}} O_{6}^{- 2} : 4 x + 6 (- 2) = - 2$
$x = + 2.5$

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