CBSE Class 12 Chemistry Answer Key 2023: The Class 12 Chemistry annual examinations of the CBSE Board were held today, February 28, 2023. Students have a lot to discuss after the exam and Chemistry is a particularly tricky subject. Check the CBSE Class 12 Chemistry question paper and answer key in pdf format here.

CBSE Class 12 Chemistry Answer Key 2023: The Central Board of Secondary Examination (CBSE) Class 12 examinations have begun, and the highly important science stream exam of Chemistry was conducted today, February 28, 2023, from 10:30 AM to 1:30 PM. Millions of students gave the exam, and all had varied experiences. Some found it tough, others too simple. One long-running after-exam tradition among students is discussing the question papers. It’s not a recommended practice, but quite irresistible. However, going over answers after exams can also reveal mistakes in questions. Students can know how and what to dispute in case their score suffers due to an external mistake. But it's important to know the SET 1, 2, 3 and 4 CBSE Class 12 answer key for that. The board doesn’t release the CBSE Class 12 Chemistry exam 2023 answer key this soon. However, you can check the but correct answer key for the CBSE class 12 Chemistry paper 2023 here. It’ll help you get a faint idea of your exam score. You can refer to the CBSE class 12 Chemistry paper 2023 answer key in this article.

CBSE hasn’t released the 2023 class 12 Chemistry question paper or answer key yet. However, you can check out the genuine question paper and CBSE Class 12 Chemistry answer key 2023 here. The official consensus of the paper was moderately difficult.

Answer: (b)  O 2 N-CH 2 -COOH

(c) H 2 -O 2 Fuel cell

Answer: (c)  H 2 -O 2 Fuel cell

Fe 3+ (aq) + e - —> Fe 2+ (aq) E o = + 0.77 V

MnO 4- (aq) + 8H + + 5e - —-> Mn 2+ (aq) + 4H 2 O (l) E o = + 1.51V

What is the cell potential for the redox reaction?

A(g) + B(g) —-> C(g) + D(g)

Initial [ A (g) ] / mol / dm -3

Initial [B (g) ]  / mol / dm -3

Initial rate  / mol / dm -3

What are the orders with respect to A(g) and B(g)?

Order with respect to A(g)

Order with respect to B(g)

Sn 2+ (aq) + 2e - -->Sn (s) E o =-0.14 V

Fe 3+ (aq) +e - --> Fe 2+ (aq) E o =+0.77 V

Which statement is correct about this voltaic cell?

(a) Fe 2+ is oxidised and the voltage of the cell is -0.91 V.

(b) Sn is oxidised and the voltage of the cell is 0.91 V.

(c) Fe2 + is oxidised and the voltage of the cell is 0.91 V.

(d) Sn is oxidised and the voltage of the cell is 0.63 V.

(a) It is an aldohexose.

(b) On heating with HI it forms n-hexane.

(c) It is present in pyranose form.

(d) It gives 2,4 DNP test.

Answer: (d) It gives 2,4 DNP test.

12. Four half reactions I to IV are shown below:

 Which two of these reactions are most likely to occur when concentrated brine is electrolysed?

13. Which property of transition metals enables them to behave as catalysts?

Answer: (d) Variable oxidation states

14. Which of the following would not be a good choice for reducing nitrobenzene to aniline?

For the questions 15 to 18 , two statements are given - one labeled as Assertion (A) and the other labelled as Reason (R ). Select the correct answer to these questions from the codes (a), (b), (c ), and (d) as given below:

(a) Both Assertion (A) and Reason (R ) are true and (R) is the correct explanation of the Assertion (A).

(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

(c) Assertion (A) is true but Reason (R) is false.

(d) Assertion (A) is false, but Reason (R) is true.

Answer: (a) Both Assertion (A) and Reason (R ) are true and (R) is the correct explanation of the Assertion (A).

Reason (R) : Vitamin C is fat soluble and is excreted from the body in urine.

Answer: (c) Assertion (A) is true but Reason (R) is false

Reason (R) : In first order kinetics when concentration of reactant is doubled, its half life is doubled.

Reason (R) : Carboxyl group increases the electron density at the meta position.

Answer: (a) Both Assertion (A) and Reason (R ) are true and (R) is the correct explanation of the Assertion (A).

Reason (R) : EDTA has 2 nitrogen and 4 oxygen donor atoms.

Answer: (a) Both Assertion (A) and Reason (R ) are true and (R) is the correct explanation of the Assertion (A).

OH-, NH + 4 , CH3NH2, H20

Answer: NH4+ ion cannot act as a ligand as it does not possess any lone pair of electrons which it can donate to central metal ion. Therefore, it does not form complexes.

(b) The complex [Co(NH3)5(NO2)]Cl2 is red in colour. Give IUPAC name of its linkage isomer.

Answer: The complex [Co(NH3)5(NO2)]Cl2 is obtained in red colour when the nitrite ligand is bound through oxygen. 

IUPAC name of its linkage isomer is - Pentamminenitrocobalt(III) chloride.

(a) Why is phenol more acidic than cyclohexanol?

(b) Give one chemical test to distinguish between the two.

(a)  Phenol is more acidic than cyclohexanol  because the phenoxide ion is more stable than the alkoxide ion. Phenoxide ion is stabilised by resonance whereas no resonance structures are possible for alkoxide ion of cyclohexanol.

(b) Bromine water test can be used to distinguish between phenol and cyclohexanol. Phenol decolorises bromine water and gives white ppt. of 2, 4, 6- tribromophenol. But cyclohexanol does not give this test.

(ii) How can the activating effect of -NH2 group in aniline be controlled?

(a) (i) Zwitter ion structure for sulphanilic acid:

(ii) The activating effect of −NH2 group can be controlled by acetylation of  −NH2 group.

Also Read: CBSE Chemistry Class 12 Syllabus 2022-2023

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