CBSE Class 12 Biology Question Paper 2015 with Answer Key (March 23, Set 3

CBSE Class 12 Biology Question Paper 2015 with Answer Key Set 3 - 57/3 is available for download. The exam was conducted by the Central Board of Secondary Education on March 23, 2015 in the Morning Session 10:30 AM to 1:30 PM. The medium of paper was English & Hindi. In terms of difficulty level, CBSE Class 12 Biology paper was of Easy level. The question paper comprised a total of 26 questions divided among 5 sections.

CBSE Class 12 Biology Set 3 - 57/3 Question Paper 2015 with Answer Key (March 23)

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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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2.
Under what condition can a bimolecular reaction become kinetically first order?

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3.
What are reducing sugars?

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4.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

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5.
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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6.
Write mechanism of acid dehydration of ethanol to ethene.

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CBSE Class 12 Biology Question Paper 2015 with Answer Key (March 23, Set 3 - 57/3)

CBSE Class 12 Biology Set 3 - 57/3 Question Paper 2015 with Answer Key (March 23)

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.
Under what condition can a bimolecular reaction become kinetically first order?

3.
What are reducing sugars?

4.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

5.
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

6.
Write mechanism of acid dehydration of ethanol to ethene.

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CBSE Class 12 Biology Set 3 - 57/3 Question Paper 2015 with Answer Key (March 23)

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.Under what condition can a bimolecular reaction become kinetically first order?

3.What are reducing sugars?

4.Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

5.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

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

Comments

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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.
Under what condition can a bimolecular reaction become kinetically first order?

3.
What are reducing sugars?

4.
Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

5.
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

6.
Write mechanism of acid dehydration of ethanol to ethene.