CBSE Class 12 Operation And Maintenance Of Communication Devices Question Paper 2018 with Answer Key (April 7)

CBSE Class 12 Operation And Maintenance Of Communication Devices Question Paper 2018 with Answer Key Set 4 is available for download. The exam was conducted by the Central Board of Secondary Education on April 7, 2018 in the Morning 10:30 AM to 1:00 PM. The medium of paper was English & Hindi.The question paper comprised a total of 33 questions.

CBSE Class 12 Operation And Maintenance Of Communication Devices Question Paper 2018 with Answer Key (April 7)

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CBSE CLASS XII Questions

1.
For decomposition of $H_2O_2$ by $I^-$: Step I: $H_2O_2 + I^- \rightarrow H_2O + IO^-$ (slow). Step II: $H_2O_2 + IO^- \rightarrow H_2O + I^- + O_2$ (fast). (a) Write rate law. (b) Determine order w.r.t. $H_2O_2$ and $I^-$ and overall order. (c) Molecularity of Step II.

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6.
Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C

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CBSE Class 12 Operation And Maintenance Of Communication Devices Question Paper 2018 with Answer Key (April 7)

CBSE Class 12 Operation And Maintenance Of Communication Devices Question Paper 2018 with Answer Key (April 7)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.
For decomposition of $H_2O_2$ by $I^-$: Step I: $H_2O_2 + I^- \rightarrow H_2O + IO^-$ (slow). Step II: $H_2O_2 + IO^- \rightarrow H_2O + I^- + O_2$ (fast). (a) Write rate law. (b) Determine order w.r.t. $H_2O_2$ and $I^-$ and overall order. (c) Molecularity of Step II.

2.
Why is o-nitrophenol more acidic than o-methoxyphenol?

3.
Why are magnesium blocks attached to iron water pipelines?

4.
Write mechanism of acid dehydration of ethanol to ethene.

5.
What are reducing sugars?

6.
Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C

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CBSE Class 12 Operation And Maintenance Of Communication Devices Question Paper 2018 with Answer Key (April 7)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.For decomposition of $H_2O_2$ by $I^-$: Step I: $H_2O_2 + I^- \rightarrow H_2O + IO^-$ (slow). Step II: $H_2O_2 + IO^- \rightarrow H_2O + I^- + O_2$ (fast). (a) Write rate law. (b) Determine order w.r.t. $H_2O_2$ and $I^-$ and overall order. (c) Molecularity of Step II.

2.Why is o-nitrophenol more acidic than o-methoxyphenol?

3.Why are magnesium blocks attached to iron water pipelines?

4.Write mechanism of acid dehydration of ethanol to ethene.

5.What are reducing sugars?

6.Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C

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1.
For decomposition of $H_2O_2$ by $I^-$: Step I: $H_2O_2 + I^- \rightarrow H_2O + IO^-$ (slow). Step II: $H_2O_2 + IO^- \rightarrow H_2O + I^- + O_2$ (fast). (a) Write rate law. (b) Determine order w.r.t. $H_2O_2$ and $I^-$ and overall order. (c) Molecularity of Step II.

2.
Why is o-nitrophenol more acidic than o-methoxyphenol?

3.
Why are magnesium blocks attached to iron water pipelines?

4.
Write mechanism of acid dehydration of ethanol to ethene.

5.
What are reducing sugars?

6.
Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C