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Chemistry 12 Past Paper 2024 | Notely

HomePast papersChemistry 122024

All Chemistry 12 papers

Class 12 · Past paper

Chemistry 12 past paper 2024

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

14 MCQs36 written questionsPractise this paper

Question index

1
Reducing smog contains high concentration of:
MCQ1 marksannual
1
Write chemical equations to show what happens when the following compounds are heated: a. $LiNO_3$ b. $NaNO_3$ c. $Mg(NO_3)_2$
Part B3 marksannual
1
Justify that $CO_2$ is an acidic oxide. How do the dioxides of $Ge$, $Sn$, and $Pb$ differ in nature from $CO_2$? Explain by giving two chemical reactions for each in support of yo…
Part C7 marksannual
2
Which one is NMR inactive nucleus?

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

What is the difference between the functional groups present in the following pairs of compounds? a. Acid halides and Acid amides b. Ethers and Esters c. Aldehydes and Ketones

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2

How is the refining of Crude oil carried out? State the basic principle involved and explain the steps in industrial process. (Do not describe the fractions)

Part C7 marksannual

3

In which of the following pairs both elements have no tendency to form dichlorides?

MCQ1 marksannual

3

Write down the electronic configuration of Copper and Chromium. Why do these electronic configurations violate the Aufbau principle?

Part B3 marksannual

3

Why Carbon and Silicon show +4 oxidation states whereas Ge, Sn and Pb show +4 as well as +2 oxidation states in their compounds? Explain. Also compare the relative stability of +4…

Part C6 marksannual

4

Describe the geometries of complex ions with coordination number 4 and 6.

Part B3 marksannual

4

Explain the structure of Benzene on the basis of molecular orbital concept. How does this concept justify the stability of benzene? Why does benzene preferably give electrophilic s…

Part C6 marksannual

5

Which of the following elements will react with $O_2$ to form an **amphoteric oxide**?

MCQ1 marksannual

5

State Fajan's rule and justify it by giving two examples.

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5

How can Acetyl Chloride be prepared from carboxylic acid? Write down the reactions of $CH_3-C(=O)-Cl$ with: a. Acetic acid b. Ethanol c. $NH_3$

Part C6 marksannual

6

Identify the colourless complex ion:

MCQ1 marksannual

6

Write down the reactions of Acetic anhydride with: a. $H_2O$ b. $NH_3$ c. $C_2H_5OH$

Part B3 marksannual

6

Describe lipids. How can essential and non-essential lipids be differentiated? Write down the following reactions of a general triglyceride: a. Hydrolysis b. Saponification

Part C6 marksannual

7

Identify the functional group in the compound formed by the reaction of an alcohol with a carboxylic acid:

MCQ1 marksannual

7

Justify that the restricted rotation about C-C bond in 1,2-dimethyl cyclopropane is responsible for geometrical isomerism.

Part B3 marksannual

7

What is mass spectrometry? Write down its basic principle. Explain the construction and working of a mass spectrometer.

Part C7 marksannual

8

How can aldehydes and ketones be differentiated by giving two chemical tests?

Part B3 marksannual

8

What is the order of acidic strength of phenol, alcohol and carboxylic acid? Justify your answer by giving $pK_a$ values, and stability of their conjugate bases.

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9

Which of the following alkenes on ozonolysis produces formaldehyde only?

MCQ1 marksannual

9

Write down the mechanism of $S_N1$ reactions.

Part B3 marksannual

10

Predict which of the following compound is more basic:

MCQ1 marksannual

10

Write down three differences between addition and condensation polymerization.

Part B3 marksannual

11

In Kolbe-Schmitt reaction, phenol is reacted with:

MCQ1 marksannual

11

How do $Cr_2O_7^{2-}$ and $CrO_4^{2-}$ ions exist in equilibrium with one another? How can they be interconverted due to this equilibrium?

Part B3 marksannual

12

An alcohol reacts with $PBr_3$ as $3R-OH + PBr_3 \rightarrow 3R-Br + H_3PO_3$. The reactivity of alcohol will be greater if it is:

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12

Briefly describe enzyme inhibition. What are its types?

Part B3 marksannual

13

Which of the following will undergo aldol condensation reaction with a mild base?

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13

How can 1-Butyne be prepared using a suitable vicinal dihalide and a geminal dihalide? Give chemical reactions with conditions.

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14

All the acid derivatives can be converted back into corresponding carboxylic acid by their reaction with:

MCQ1 marksannual

14

What is the greenhouse effect? Give its brief description.

Part B3 marksannual

15

Which of the following nitrogenous bases is **NOT** present in DNA?

MCQ1 marksannual

15

Write down the reactions of Phenol with conc. $HNO_3$, aq. $Br_2$ and conc. $H_2SO_4$.

Part B3 marksannual

16

Nylon-6,6 is the polymer of:

MCQ1 marksannual

16

Describe the type of electronic transition that occurs when UV-Vis radiations of 200-800 nm wavelength are passed through $CH_2=CH-CH_2-OH$.

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17

Write down three differences between E1 and E2 reactions.

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18

Describe the significance of Functional group region and Finger print regions in the IR spectrum.

Part B3 marksannual

19

Justify that $Al(OH)_3$ is amphoteric but $Mg(OH)_2$ is basic.

Part B3 marksannual

20

Write down the reactions of $CH_3-CH_2-Mg-Br$ with: a. Acetone b. $CO_2$.

Part B3 marksannual

21

Describe anomalous trends in the ionization energies of elements of 3rd period in the periodic table.

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22

Why is Acetaldehyde more reactive than Acetone in nucleophilic addition reactions?

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23

Write down two reactions in which O-H bond of alcohol is broken. What is reactivity order of different alcohols in these reactions?

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24

What is the role of chloro-fluoro carbons (CFCs) in destroying the ozone layer in the stratosphere?

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25

Write down the chemical reactions for the following observations: a. Calcium when heated in air (containing O₂ and N₂) results in the formation of two compounds. b. One of the abov…

Part B3 marksannual

26

Naturally occurring magnesium has three isotopes: $Mg-24$ (mass=24 amu, 78.70%), $Mg-25$ (mass=25 amu, 10.13%), $Mg-26$ (mass=26 amu, 11.17%). Calculate relative atomic mass of $Mg…

Part B3 marksannual

27

How can ethene be converted into: a. Ethanol b. Ethylene chlorohydrin

Part B3 marksannual

28

Acetone undergoes aldol condensation reaction with a mild base. Write down the mechanism of this reaction of acetone.

Part B3 marksannual