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Chemistry 12 Past Paper 2022 | Notely

HomePast papersChemistry 122022

All Chemistry 12 papers

Class 12 · Past paper

Chemistry 12 past paper 2022

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

27 MCQs41 written questionsPractise this paper

Question index

1
Which of the following carbides is decomposed by water to form $CH_4$ gas?
MCQ1 marksannual
1
Why thermal stability of carbonates of Group-II elements increases down the group? Describe by giving examples.
Part B3 marksannual
1
Predict the products of reaction between $Na_2O_2$ and ice-cold water:
MCQ1 marksannual
1
Justify why $AlCl_3$ is non-conductor in both solid and molten states (under high pressure) whereas $NaCl$ is conductor in molten state.

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.

Part B3 marksannual

1

$CO_2$ is gas whereas $SiO_2$ is solid. Explain with the help of their structures.

Part C6 marksannual

2

Explain the regular and anomalous trends in ionization energies of elements of the 3rd period.

Part B3 marksannual

2

Identify the elements which show anomalous trend in ionization energy across the third period of periodic table:

MCQ1 marksannual

2

Give reasons for: a. BeO is amphoteric b. BeO is covalent in nature but has high melting point.

Part B3 marksannual

3

Which of the following will form yellow coloured complex compound?

MCQ1 marksannual

3

Write down the reactions of $[Fe(H_2O)_6]^{3+}$ with $NH_3$, $CO_3^{2-}$ and $SCN^{-}$.

Part B3 marksannual

3

Which of the following compounds is used as NMR reference?

MCQ1 marksannual

3

a. Why is PbCl₄ thermally unstable whereas PbCl₂ is stable? b. Why does CCl₄ not undergo hydrolysis?

Part B3 marksannual

3

What is geometrical isomerism? Write down its conditions. Explain with reference to Alkenes and Cycloalkanes giving one example for each.

Part C7 marksannual

4

Geometry of $[Pt(NH_3)_4]^{2+}$ is square planar. Hybridization of $Pt$ in the complex ion is:

MCQ1 marksannual

4

Why do transition elements show variable oxidation states?

Part B3 marksannual

4

Write down the chemical reactions to show the oxidation of $[Cr(H_2O)_6]^{3+}$ to $CrO_4^{2-}$ in three steps.

Part B3 marksannual

4

What is meant by inhibition of enzymes? Explain giving its types.

Part C6 marksannual

5

In destructive distillation, **Coal** is heated at $500-1000^{\circ}C$ in the absence of air. It gives:

MCQ1 marksannual

5

What is **homologous series**? Draw structures of first four members of homologous series of **acid amides**.

Part B3 marksannual

5

Describe how $Fe^{2+}$ acts as a catalyst in reaction between peroxodisulphate ion ($S_2O_8^{2-}$) and iodide ion ($I^-$).

Part B3 marksannual

5

What is iodoform test? Give its any three applications.

Part C6 marksannual

6

How can **1-Butyne** be prepared from: a. A vicinal dihalide b. A geminal dihalide

Part B3 marksannual

6

Predict the type of isomerism shown by the following compounds: $CH_3-CH_2-OH$ and $CH_3-O-CH_3$.

MCQ1 marksannual

6

Why is the concept of functional group important in organic chemistry?

Part B3 marksannual

6

What is Ozone hole? Describe three reasons for its formation. How ozone layer can be protected?

Part C7 marksannual

7

Which of the following is a **meta-directing group** in electrophilic aromatic substitution reactions of monosubstituted benzene?

MCQ1 marksannual

7

Why the salts of $Be^{2+}$ cannot have more than four water molecules of crystallization?

Part B3 marksannual

7

Which of the following is more basic?

MCQ1 marksannual

7

Differentiate between structural and stereo isomerism.

Part B3 marksannual

8

Which of the following base will favour substitution reaction as compared to the elimination reaction?

MCQ1 marksannual

8

Differentiate between **Propyne** and **Propene** by giving two chemical tests.

Part B3 marksannual

8

Give chemical reactions to predict the products of reaction between 1-Butene and: a. $Br_2 / CCl_4$ b. $Cl_2 + H_2O$ c. $C_6H_5-C(=O)-O-O-H$ (Peroxybenzoic acid)

Part B3 marksannual

9

Write down the mechanism of $E_1$ reaction and support it by giving one evidence.

Part B3 marksannual

9

Identify the reactant $X$ in the following conversion: $CH_3-CO-NH_2 + X \rightarrow CH_3-NH_2$

MCQ1 marksannual

9

What is the trend of halide ions as reducing agents? Justify your answer.

Part B3 marksannual

10

Which of the following alcohols on reaction with $K_2Cr_2O_7/H_2SO_4$ will give an **alkene**?

MCQ1 marksannual

10

Write down the reactions of $CH_3MgCl$ with: a. $CH_3CHO$ b. Formaldehyde ($HCHO$)

Part B3 marksannual

10

Which of the following alcohols is most reactive in a reaction involving the cleavage of C-O bond?

MCQ1 marksannual

10

What are diazonium salts? How can this salt be prepared from Aniline? What happens when this salt is heated above 10°C?

Part B3 marksannual

11

Oxidative cleavage of ethane-1,2-diol (glycol) with $HIO_4$ gives:

MCQ1 marksannual

11

Compare **basicity** of following compounds by giving reasons: a. $CH_3-CH_2-NH_2$ b. $NH_3$ c. $CH_3-NH_2$

Part B3 marksannual

11

Identify the correct order of acidic strength of carboxylic acids, phenols and alcohols.

MCQ1 marksannual

11

Write down the mechanism for dehydration of excess of Ethanol with conc. H₂SO₄ at 140°C.

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12

Which of the following tests is applied to differentiate between **Ethanal** and **Propanal**?

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12

Why is phenol more acidic than alcohols?

Part B3 marksannual

12

Describe the Kolbe-Schmitt reaction of phenol.

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13

Acetic acid is reacted with $NH_3$ and the resulting compound is strongly heated. Identify the compound formed.

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13

How can Primary, Secondary and Tertiary alcohols be differentiated by Lucas test?

Part B3 marksannual

13

Which of the following organic compounds will undergo **Cannizzaro's reaction**?

MCQ1 marksannual

13

Write down two tests to differentiate between Aldehydes and Ketones.

Part B3 marksannual

14

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

MCQ1 marksannual

14

Write down the reactions of **Acetaldehyde** with: a. Zn/Hg-HCl b. 2,4-DNPH c. C₂H₅OH

Part B3 marksannual

14

Sucrose is the disaccharide of:

MCQ1 marksannual

14

Write down the reactions for following conversions: a. Acetamide into Ethyl amine b. Acetyl chloride into acetic anhydride c. Calcium acetate into acetone

Part B3 marksannual

15

Nylon-6,6 is the polymer of:

MCQ1 marksannual

15

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

Part B3 marksannual

15

Nail polish remover is the mixture of:

MCQ1 marksannual

15

How can $CH_3COOH$ be prepared from: a. A Grignard reagent b. A Nitrile c. An Alcohol

Part B3 marksannual

16

Identify **greenhouse gases**:

MCQ1 marksannual

16

How can $CH_3COOH$ be converted into: a. $CH_3CH_2OH$ b. $CH_3CONH_2$

Part B3 marksannual

16

Which of the following parameters indicates the concentration of oxidizable material in water?

MCQ1 marksannual

16

Write down three differences between DNA and RNA.

Part B3 marksannual

17

In IR spectrum, a strong peak at $1720 \text{ cm}^{-1}$ indicates the presence of:

MCQ1 marksannual

17

Co-ordination number of Cobalt in $[Co(en)_2Cl_2]Cl$ is:

MCQ1 marksannual

17

How can petrochemical raw materials be classified?

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18

What is meant by refining of petroleum? State its basic principle.

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19

What type of electronic transition takes place when an organic compound is subjected to visible radiation in the wavelength range of $200-800 \text{ nm}$?

Part B3 marksannual

20

Differentiate between Atomic emission spectroscopy and Atomic absorption spectroscopy.

Part B3 marksannual