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12th-class chemistry pairing scheme 2023
, you are on the right page. Here we will provide the 2nd year chemistry pairing scheme 2023. Pairing Scheme Helps the student in the Preparation of the Paper because the Scheme focuses on the essential topics related to the Exam Point Of View. This 12th class chemistry pairing scheme 2023 is valid for all Punjab Board Including Lahore Board, Multan Board, Gujranwala Board, Sahiwal Board, Sargodha Board, DG Khan Board, Faisalabad Board, and BISE Jammu Kashmir. To Download the 2nd year chemistry pairing scheme 2023 Multan board Click on the Download Button Given Below.
| Chapter | MCQ's | Chapter | MCQ's | Chapter | MCQ's |
|---|---|---|---|---|---|
| 1 | 1 | 7 | 1 | 13 | 1 |
| 2 | 1 | 8 | 1 | 14 | 1 |
| 3 | 1 | 9 | 1 | 15 | 1 |
| 4 | 1 | 10 | 1 | 16 | 1 |
| 5 | 1 | 11 | 2 | ||
| 6 | 1 | 12 | 1 |
| Question #2 | Question #3 | Question #4 | |||
|---|---|---|---|---|---|
| Chapter No. | No. Of Questions | Chapter No. | No. Of Questions | Chapter No. | No. Of Questions |
| 3 | 3 | 4 | 2 | 6 | 3 |
| 9 | 3 | 7 | 3 | 11 | 3 |
| 14 | 3 | 8 | 3 | 12 | 2 |
| 16 | 3 | 10 | 2 | 13 | 1 |
| 15 | 2 |
| Question #5 | Question #6 | Question #7 | Question #8 | Question #9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| (a) | (b) | (a) | (b) | (a) | (b) | (a) | (b) | (a) | (b) |
| Ch-01 | Ch-02 | Ch-05 | Ch-15 | Ch-07 | Ch-09 | Ch-08 | Ch-10 | Ch-12 | Ch-13 |
2nd year chemistry guess paper 2023- Important Questions chapterwise
Below is the detailed guess paper for Chemistry class 12 which includes all chapter important questions 2023. This Guess Paper is made Following the previous years' exam and important topics according to most senior professors. In this 12th chemistry model question paper are also included.
Chapter 1
Important short questions
1. Why metals are good conductors?
2. Define hydration energy with examples.
3. Diamond is a non-conductor but graphite is a good conductor. Why?
4. Ionization energy increases from left to right in a period. Justify.
5. How does hydrogen resemble group IV-A elements.
6. Why oxidation number of noble gases is usually zero?
7. What is electron affinity? Give its trend in the periodic table.
8. Justify the position of hydrogen at the top of group VII-A elements.
9. Give reasons the hydration energy of Al3+ ions more than Mg2+ ion?
10. Give differences between lithium from its own family members.
11. Why the size of an anion is always greater than its parent atom?
12. Name various classes of hydrides.
13. Why metallic character increases from top to bottom in a group of metals?
14. Alkali metals give ionic hydrides. Why?
15. Give four uses of nitric acid.
Important long questions
1. Give trends of metallic character in groups and periods and discuss the impact of atomic size on it.
2. Explain the term periodic table and discuss the improvements made in Mendeleeve’s periodic table.
3. What are hydrides? Discuss their classification and properties.
Chapter 2
Important short questions
1. How does hydrogen resemble alkali metals?
2. Write the formula of borax and Chile saltpeter.
3. Give the formula of natron and halite.
4. How will you distinguish between ethanol and propanol.
5. Give two similar properties of lithium and magnesium.
6. Write the chemical formula of Beryl and Barite.
7. What are two major problems faced during the working of diaphragm cells?
8. Why Down’s cell is the preferable method for the preparation of sodium on a large scale?
9. Give the formula of (i). Dolomite (ii.) Asbestos
10. What reaction occurs when (i). Lithium carbonate is heated (ii). Sodium bicarbonate is heated
Important long questions
1. Discuss the preparation of sodium hydroxide on a commercial scale by diaphragm cell or Nelson’s cell.
2. Describe the process of sodium metal manufacturing by Down’s cell.
3. Complete and balance the following equations
i. Li2O + H2O ii. Na2O + H2O iii. Mg + (OH)2 iv. NaNO3
Chapter 3
Important short questions
1. Write four uses of Borax.
2. What is the borax bread test?
3. How is Borax used as water softening agent?
4. Why are borate glazes preferred over silicate glazes?
5. Give any four uses of aluminum in our daily life.
6. Give two similarities between carbon and silicate.
7. Give a reaction of P2O5 with cold and hot water
8. The aqueous solution of borax is alkaline. Give reason.
9. What is carbonization?
10. Explain the structure of CO2.
11. Write two uses of sodium silicate. (2)
12. How borax can be prepared from Colemanite? Give equation
13. Write names and formulas of oxyacids of nitrogen.
Important long questions
1. Write a note on aluminum silicate.
2. Write a method for the preparation of water glass. Also, write uses of water glass.
3. How will you convert boric acid into borax and vice versa.
Chapter 6
Important short questions
1. All exercise short questions.
Important long questions
1. Write a note: i) Binding energy ii) Paramagnetism.
2. Explain the following properties for the transition element. I) Paramagnetic ii) Colour
Chapter 7
Important Short Questions
1. What is meant by organic chemistry?
2. What are homocyclic and heterocyclic compounds? Give examples.
3. Why is ethene an important industrial element?
4. Define isomers. Write the names of its four types.
5. What is meant by a functional group? Name typical functional groups containing oxygen.
6. Define thermal cracking and steam cracking.
7. What is meant by catenation? Give examples.
8. What is meant by cis-trans isomerism?
9. Define tautomerism and give an example.
10. Define alicyclic and aromatic compounds.
11. What is petroleum? Give its origin.
12. Why is ethene an important industrial chemical?
13. What is coal tar? Give its fractions.
14. How will you define the octane number? How it can be improved?
15. What is iodized salt?
16. Write the structural formula of two possible isomers of C4H10.
17. Describe important sources of organic compounds.
18. What is catalytic cracking?
Important long questions
1. What is orbital hybridization? Explain,, and mode of hybridization
2. Describe the important sources of organic compounds.
3. Define Isomerism. Explain its types.
4. 2. Write down the process of cracking petroleum.
Chapter 8
Important short questions
1. How do you distinguish between ethane and ethyne?.
2. Why the Ï€ bond is more reactive than Ï bond?
3. Convert 1-butene to 1-butyne.
4. Give four uses of methane.
5. Synthesize i.benzene ii. Oxalic acid from ethyne.
6. Convert ethene into ethyl alcohol?
7. What is Markonikov’s rule?
8. Write a note on the acidity of ethene?
9. Convert methane into formic acid.
10. What is Raney-Nickel? Give its uses.
11. Alkanes are less reactive than alkenes. Comment.
12. Convert ethyne into acetaldehyde.
13. How cis and trans alkenes are produced? Give reactions.
14. Convert ethene into ethyl alcohol?
15. What is hydrogenolysis?
16. What is Baeyer’s Test? Give its uses
Important Long questions
1. Describe with examples the acidic nature of alkynes?
2. Give a comparison of the reactivity of alkanes, alkenes, and alkynes.
3. Prepare Ethane from Kolbe’s Electrolytic method. Write down its mechanism.
4. Give the chemical reactions of ethene with:
(i) O2 in the presence of Ag2O (ii) Conc. H2SO4 (iii) S2Cl2 (iv) HOCl.
Chapter 9
Important short questions
1. Briefly describe x-ray studies of benzene structure.
2. Define electrophile. Give two examples.
3. Give the reaction of benzene with ozone. (ozonolysis)
4. How benzene is converted into maleic acid by catalytic oxidation?
5. What are aromatic compounds?
6. Why benzene is less reactive than alkene?
7. What is Wurts Fitting reaction? Give its importance.
8. Give two oxidation reactions of benzene.
9. What are fused rings' aromatic compounds?
10. Give the reaction of benzene with SO3.
11. Prepare benzene from i. n-Hexane ii. Sodium benzoate
12. Give the mechanism of nitration of Benzene.
13. Give reactivity of benzene towards electrophiles.
14. Show Benzene’s cyclic structure with a diagram.
15. Define aromatization.
Important long questions
1. Convert Benzene into:
i) Cyclohexane ii) Maleic acid iii) Glyoxal iv) Benzene sulphonic acid
2. What are Friedel-Crafts reactions? Explain the mechanism of alkylation and acylation of benzene
3. Write any four chemical methods for the preparation of benzene.
4. Give reactions of benzene concerning (i) nitration (ii) sulphonation
Chapter 10
Important Short Questions
1. Prepare (i) ethyl bio alcohol (ii) ethyl acetate from ethyl bromide.
2. What are primary, secondary, and tertiary alkyl halides? Give an example of each.
3. Explain Markownikov’s rule with a suitable example.
4. Starting from C2H4Br how will you prepare ethane and ethene?
5. Explain the following reaction: CH4 CH3CH2COOH.
6. How do you compare SN1 and SN2 mechanisms?
7. How do we get alkyl nitriles from Grignard’s reagent?
8. What are elimination reactions? Give an example of an E1 reaction.
9. What is Grignard reagent?
10. What are Alkyl halides? Give their general formula.
11. What are the types of nucleophilic substitution reactions?
12. Convert ethyl alcohol into their respective halides by using PCl3 and PI5
13. What is Wurtz synthesis?
14. What is Grignard reagent?
Important Long Questions
1. Describe the SN2 reaction of alkyl halides with details.
2. Explain the mechanism of nucleophilic substitution reaction.
3. Describe β elimination reaction E2 with an example.
4. How the presence of a double bond can be detected by using Baeyre’s reagent?
Chapter 11
Important short questions
1. Convert methanol into ethanol
2. Differentiate between primary and secondary alcohols.
3. Write the structural formula of a)carbolic acid b)glycerol
4. What are rectified spirit, commercial alcohol, and absolute alcohol?
5. Why water has a higher boiling point than ethanol?
6. Convert methanol into ethanol and acetone into ethyl alcohol.
7. What is Lucas's test?
8. Give the uses of ethylene alcohols and methyl alcohols.
9. Ethyl alcohol is liquid while methyl chloride is a gas. Why?
10. Write the names and formulas of two polyhydric alcohols.
11. Define fermentation. Give its conditions.
12. Absolute alcohols cannot be prepared by fermentation. Why?
13. What is wood spirit? How is it prepared from water gas?
14. Write an equation for the reaction of C2H5OH with PBr3, PCI5
Important Long Question
1. How alcohols are prepared? Give their properties and uses.
2. What is either? Give its reactions.
3. Explain the following properties concerning phenol: i) Esterification ii)sulphonation
Chapter 12
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Chapter 13
Important Short Questions
1. What are peptides and peptide linkage?
2. What is the ninhydrin test?
3. What are aromatic carboxylic acids?
4. Give the mechanism for the esterification of the carboxylic acids.
5. What are essential and non-essential amino acids?
6. Name five dicarboxylic acids and give their formulas.
7. What is Strecker’s synthesis?
8. Give four uses of nitric acid.
9. How carboxylic acid is converted into a-amino acids?
10. Give four uses of acetic acid.
11. How ethanol is converted into acetic acid and vice versa?
12. Define proteins? How do they differ from polypeptides?
13. What are fatty acids? Give examples.
14. What are Zwitter ions? Give equation.
15. How will you prepare acetic acid from ethyne?
Chapter 14
1. Define carbohydrates. Classify them and give an example of each.
2. What do you mean by the rancidity of fats and oils?
3. Define the following: i. proteins ii. Lipids iii. polymers
4. How is polystyrene prepared? Give its two uses.
5. Give the structure of cholesterol.
6. Write down the uses of proteins.
7. What are saponification number and iodine number?
8. What are fatty acids? Give examples.
9. How polymers are classified based on heat effect?
Chapter 15+16
1. What reaction takes place in the decomposition zone during the manufacturing of cement?
2. Which type of woody raw material is used in the paper industry?
3. Write two woody and two nonwoody raw materials for paper pulp manufacture.
4. What are macronutrients?
5. What is the role of chlorofluorocarbons in destroying ozone?
6. How do you compare SN1 and SN2 mechanisms?
7. What is the need for fertilizers?
8. What do you mean by prilling of urea?
9. What are some commonly used bleaching agents in paper manufacture?
10. Define clinker? How is it used in the manufacturing of Cement?
11. What is meant by the setting of cement?
12. What is the role of phosphorus in the growth of plants?
13. Give the role/importance of potassium in the growth of plants.
14. Write names of steps in the paper making process.
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