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Chemistry 12 Past Paper 2025 | Notely

HomePast papersChemistry 122025

All Chemistry 12 papers

Class 12 · Past paper

Chemistry 12 past paper 2025

50 published questions in this index. The full practice view lets you work through them and track your own attempts.

15 MCQs35 written questionsPractise this paper

Question index

1
Which of the following nuclei will be magnetically active in NMR spectroscopy?
MCQ1 marksannual
1
Justify the given statements: a. Al is considered as the best conductor in 3rd period elements. b. Size of Na⁺ is smaller than Na.
Part B3 marksannual
1
What is Grignard's reagent? Outline the step by step synthesis of Propanoic Acid, 2-Propanol and Ethane using suitable Grignard reagent.
Part C7 marksannual
2
The presence of specific functional groups in a molecule is commonly identified by:

This is a skimmable index, not a replacement for the study surface. Open the practice view to answer questions and use the linked study material.

MCQ1 marksannual

2

How does $Fe^{+2}$ act as a catalyst in the given reaction? Write its two-step mechanism: $S_2O_8^{2-} + 2I^- \xrightarrow{Fe^{+2}} 2SO_4^{2-} + I_2$

Part B3 marksannual

2

What is mass spectrometry? Explain its working and its applications in determining the relative atomic mass.

Part C7 marksannual

3

Which of the 3rd period elements has the highest melting point?

MCQ1 marksannual

3

Write two chemical reactions to show the acidic nature of $SO_3$.

Part B3 marksannual

3

Provide the chemical reactions for the hydrolysis of Group-IV tetrahalides. Explain why carbon tetrahalides are not hydrolysed and describe the trend in ease of hydrolysis of tetra…

Part C6 marksannual

4

Which of the following statement is correct regarding the density of Group-I elements?

MCQ1 marksannual

4

Why are group IIB and IIIB elements considered as non-typical transition elements?

Part B3 marksannual

4

Explain the mechanism of nitration and Friedel-Crafts acylation of benzene, highlighting key steps and intermediates.

Part C6 marksannual

5

Which sulphate of Group-II elements has the highest solubility in water?

MCQ1 marksannual

5

Complete and balance the given chemical equations.

Part B3 marksannual

5

Write chemical equations to illustrate the basic nature of Group-I normal oxides, per-oxides and super oxides using $Na_2O$, $Na_2O_2$ and $NaO_2$ as examples.

Part C6 marksannual

6

Coordination number in $[Cu(NH_2-NH_2)_2]SO_4$ is:

MCQ1 marksannual

6

Identify the type of synthesis (Partial or total) for each of the following: a. Conversion of Ethanol into Ethanal. b. Synthesis of vegetable Ghee from oil.

Part B3 marksannual

6

Provide the chemical equations for the Nucleophilic addition reactions between: a. Acetone and Phenyl Hydrazine b. Acetaldehyde and 2,4-Dinitrophenyl Hydrazine c. Formaldehyde and…

Part C6 marksannual

7

Identify the organic compound:

MCQ1 marksannual

7

Beryllium ($Be$) differs from other alkaline earth metals in terms of its reactions with hydrogen and alkalis. Describe these differences and provide the relevant chemical equation…

Part B3 marksannual

7

By providing resonance structures of their conjugate bases, explain why the order of acidic strength is: $RCOOH > Phenol > Alcohol$

Part C7 marksannual

8

Homolytic cleavage of covalent bond converts the bonded atoms into:

MCQ1 marksannual

8

Write chemical reactions of $KMnO_4$ in acidic medium with: a. $FeSO_4$ b. Mohr's Salt (Balancing is not necessary)

Part B3 marksannual

8

Describe the effects of pH, Temperature and Substrate Concentration on enzyme activity. (Include a general graphical representation illustrating the optimum conditions for enzyme a…

Part C7 marksannual

9

Which alcohol will yield alkenes more easily among the given options?

MCQ1 marksannual

9

Sodium and Magnesium belong to the same period but why is Sodium Carbonate more stable than Magnesium Carbonate?

Part B3 marksannual

10

Which of the following alkyl halides is most likely to undergo an $SN_2$ reaction?

MCQ1 marksannual

10

Identify the type of isomerism in given pairs: a. 1-Chloro propane and 2-Chloro propane b. Butanone and Butanal c. Diethyl Ether and Methyl Propyl Ether

Part B3 marksannual

11

Which alcohol is **NOT** the direct product of reaction when Grignard reagent reacts with aldehydes or ketones?

MCQ1 marksannual

11

Briefly explain the 'Coal' and 'Petroleum' as the source of organic compounds.

Part B3 marksannual

12

Which alcohol will yield an immediately oily layer according to Lucas test?

MCQ1 marksannual

12

Briefly explain simple, conjugated and derived proteins with one example in each case.

Part B3 marksannual

13

Which of the following will be more reactive towards nucleophilic addition reactions?

MCQ1 marksannual

13

Briefly describe any three types of adhesives.

Part B3 marksannual

14

Carboxylic acids are reduced to which product on reaction with $LiAlH_4$?

MCQ1 marksannual

14

Describe two sources of oxides of Nitrogen and Sulphur with one environmental impact associated with each of these pollutants.

Part B3 marksannual

15

Differentiate between qualitative and quantitative analysis with suitable example in each.

Part B3 marksannual

16

Differentiate between addition and condensation polymers with suitable example in each.

Part B3 marksannual

17

Ozone is being mainly destroyed by:

MCQ1 marksannual

17

How can ethanol and acetone be differentiated using I.R spectroscopy specifically through characteristic signals?

Part B3 marksannual

18

Provide the chemical equation to illustrate how ozonolysis of an alkyne can be used to prepare two molecules of acetic acid.

Part B3 marksannual

20

Explain why the basic strength of amines follows the order: Secondary amine > Primary amine > Tertiary amine

Part B3 marksannual

21

Arrange the following alcohols in order of increasing reactivity towards the cleavage of O-H bond: Ethanol, 2-Methyl-2-Propanol and 2-Propanol.

Part B3 marksannual

22

Which is the stronger acid between difluoroethanoic acid or trifluoroethanoic acid? Give reason.

Part B3 marksannual

23

Write any three differences between $E_2$ and $E_1$ reactions of alkyl halides.

Part B3 marksannual

24

What are the alternatives to ChloroFluoro carbons (CFCs)? How do they compare in terms of environmental impact and effectiveness?

Part B3 marksannual

25

Write the mechanism of the given reaction: $2CH_3OH \xrightarrow[140^{\circ}C]{\text{Conc. } H_2SO_4} CH_3OCH_3 + H_2O$

Part B3 marksannual

26

Briefly describe why ethanol exhibits three signals in its NMR spectrum, whereas acetone shows only one signal.

Part B3 marksannual

27

Complete the given chemical equations: a. $CH_3COCl + CH_3COOH \rightarrow$ b. $CH_3COOC_2H_5 + LiAlH_4 \rightarrow$ c. $CH_3MgBr + CH_3CN \rightarrow$

Part B3 marksannual

28

Write two chemical equations to show the amphoteric nature of $BeO$.

Part B3 marksannual