CBSE Class 12 Urdu Elective Question Paper 2019 with Answer Key (March 26)

CBSE Class 12 Urdu Elective Question Paper 2019 with Answer Key Set 4 is available for download. The exam was conducted by the Central Board of Secondary Education on March 26, 2019 in the Morning Session 10:30 AM to 1:30 PM. The medium of paper was Urdu. The question paper comprised a total of 11 questions.

CBSE Class 12 Urdu Elective Question Paper 2019 with Answer Key (March 26)

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CBSE Class 12 Previous Year Question Papers

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CBSE CLASS XII Questions

1.
Predict the alkene formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

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2.
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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3.
Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether
(b) p-Hydroxyphenethyl alcohol + HBr

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4.
Why are magnesium blocks attached to iron water pipelines?

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5.
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.
What are reducing sugars?

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CBSE Class 12 Urdu Elective Question Paper 2019 with Answer Key (March 26)

CBSE Class 12 Urdu Elective Question Paper 2019 with Answer Key (March 26)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.
Predict the alkene formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

2.
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

3.
Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether
(b) p-Hydroxyphenethyl alcohol + HBr

4.
Why are magnesium blocks attached to iron water pipelines?

5.
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.

6.
What are reducing sugars?

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CBSE Class 12 Urdu Elective Question Paper 2019 with Answer Key (March 26)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.Predict the alkene formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

2.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

3.Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether (b) p-Hydroxyphenethyl alcohol + HBr

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

5.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.

6.What are reducing sugars?

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1.
Predict the alkene formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

2.
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

3.
Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether
(b) p-Hydroxyphenethyl alcohol + HBr

4.
Why are magnesium blocks attached to iron water pipelines?

5.
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.

6.
What are reducing sugars?