CBSE Class 12 Biology Question Paper 2019 with Answer Key (March 15, Set 2- 57/5/2)

CBSE Class 12 Biology Question Paper 2019 with Answer Key Set 2- 57/5/2 is available for download. The exam was conducted by the Central Board of Secondary Education on March 15, 2019 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 to Moderate level. The question paper comprised a total of 27 questions divided among 4 sections.

CBSE Class 12 Biology Set 2- 57/5/2 Question Paper 2019 with Answer Key (March 15)

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CBSE Class 12 Previous Year Question Papers

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CBSE CLASS XII Questions

1.
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

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2.
Explain: (i) Presence of carbonyl group in glucose. (ii) Presence of five $-$OH groups attached to different carbon atoms.

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3.
Why is o-nitrophenol more acidic than o-methoxyphenol?

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4.
Under what condition can a bimolecular reaction become kinetically first order?

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5.
Why are magnesium blocks attached to iron water pipelines?

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6.
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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CBSE Class 12 Biology Question Paper 2019 with Answer Key (March 15, Set 2- 57/5/2)

CBSE Class 12 Biology Set 2- 57/5/2 Question Paper 2019 with Answer Key (March 15)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

2.
Explain: (i) Presence of carbonyl group in glucose. (ii) Presence of five $-$OH groups attached to different carbon atoms.

3.
Why is o-nitrophenol more acidic than o-methoxyphenol?

4.
Under what condition can a bimolecular reaction become kinetically first order?

5.
Why are magnesium blocks attached to iron water pipelines?

6.
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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CBSE Class 12 Biology Set 2- 57/5/2 Question Paper 2019 with Answer Key (March 15)

CBSE Class 12 Previous Year Question Papers

CBSE CLASS XII Questions

1.Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

2.Explain: (i) Presence of carbonyl group in glucose. (ii) Presence of five $-$OH groups attached to different carbon atoms.

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

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

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

6.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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1.
Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

2.
Explain: (i) Presence of carbonyl group in glucose. (ii) Presence of five $-$OH groups attached to different carbon atoms.

3.
Why is o-nitrophenol more acidic than o-methoxyphenol?

4.
Under what condition can a bimolecular reaction become kinetically first order?

5.
Why are magnesium blocks attached to iron water pipelines?

6.
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.