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  • BISE Sahiwal 12th Class Chemistry Guess Paper 2019
  • BISE Multan 12th Class Chemistry Guess Paper 2019
  • BISE DG Khan 12th Class Chemistry Guess Paper 2019
  • BISE Rawalpindi 12th Class Chemistry Guess Paper 2019
  • BISE Lahore 12th Class Chemistry Guess Paper 2019
  • BISE Gujranwala 12th Class Chemistry Guess Paper 2019
  • BISE Faisalabad 12th Class Chemistry Guess Paper 2019
  • BISE Sargodha 12th Class Chemistry Guess Paper 2019

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12th Class Chemistry Guess Paper 2019

Chapter One

The position of hydrogens, oxides, hydroxide, and halides

Short question.

metallic oxides are basics and non-metallics are acidic why?

Periods in periodic table.merits and demerits of Mendeleev,s periodic tables..

what is lanthanide contraction?2nd electron affinity is exothermic why? hydration energy its factors?.

Amphotaric oxides. And question number 7 – 13 from exercise.

Chapter 2

Short question:

Discuss solubility of sulfates and carbonates. The reaction of alkali metals with oxygen and water. Lime mortar. How plaster of Paris is prepared from gypsum. Slacking of lime. Alkali metals are strong reducing agent why? How can K02 be used by mountainer? The solution of Na2Co3 is basic why? And question number 7

Long question:

(b) 9

(b) from exercises.

Peculiar behavior of lithium. Down cell and diaphragm cell.

Chapter 3

Short question:

What is inner pairs effect? How borax is prepared by to methods.

Uses of borax and Boric acids.

effects of heat on borax…

Uses of sodium silicates. CO2 is gas while SiO2 is solids why?

Peculiar behavior of carbons. Chemical garden.

Why silicones are more proffered over petroleum.

What are basic lead and lead chromates? borax bead tests. orthoboric acid is monobasic acid why.

Chapter 4

Short question:

What is laughing gas it is prepared.

Aqua regia.

Uses of nitric acids.

The reaction of nitric acid with bases carbon, phosphorus, sulfur, Cu, Sn. Zn

The reaction of P2O3 and P2O5 with cold & hot water.P2O5 as dehydrating agents.similarities and dissimilarities of sulfur and oxygen. Reaction of sulphuric acid( All)Reaction of NO2 with water and with phosphorus .ring test. And allotrope of phosphorus.

Chapter 5

Short question:

Halogens are oxidizing agents why.

How I205 can be used for quantitative analysis of C0. What is available chlorine?

Uses of fluorines, chlorine, bromine, and iodine separate. How xenon tetraoxide is prepared. Uses of noble gases. Question number 4 and 6 b 8 b from exercise.

Chapter 6

Long question :

Properties of transition element. Manufacture of steels. Type of steel. Electron chemicals theory.

Short question:

Typical and nontypical transition elements.

The melting point and its trend. Binding energy and its trend paramagnetism.

why transition elements compounds show colors. What are ligands? What is coordination sphere? What are chelates? Classification of steel.

Galvanizing of zinc. And cathode coating. Chromyl chloride test. How KMnO4 is prepared by two methods.

How chromates are converted into dichromates. Write reactions of KMnO4 with oxalic acid ferrous sulfate and KI

Chapter 07

Long question:

Cracking, reforming and geometrical isomerism.

Short questions:

What is peculiar nature of carbon? How is anthracite prepared? What is natural gas? What is the functional group? Give examples. Metamerism.tautomerism and functional group isomerism. Question 15 from exercise

Chapter 08

Acidic nature, halogenation of alkane. kolbe,s electrolytic method,

Short question:

Exercise

Chapter 9

Long question:

Friedel Crafts reactions. Nitration sulphonation. Stability of benzene. Kekule structure and points favoring it.

Short question:

Differentiate between mono and polycyclic aromatic compound. Prepare benzene by 2 methods especially from alkanes. Prepare glyoxal,oxalic acid,maliec acid benzoic acid and meta nitrochloro benzene from benzenes.

Chapter 10

Long question:

SN1 ,SN2 and E1 ,E2. Reactions of Grignard reagents.

Short question:

Reactivity of alkyl halides. Prepare alkyl halite by two methods. Electrophile,nucleotide.

Questions 8,12 from exercise.

Chapter 11

Long question:

Preparation of methanols. Reactions of phenols.

Short questions.

Acidic nature of phenol. Lucas tests. Oxidation and hydration of alcohol. Williamson,s synthesis.

Question 10,11,12 from exercises

Chapter 12

Long question:

Preparation of formaldehyde and acetaldehyde. Aldol condensation and Cannizzaro reactions. Iodoform reaction.

Short question:

Prepare lactic acid from ethanols. Addition of sodium sulfite in carbonyl compounds.  Reduction of carbonyl compounds. Uses of acetaldehyde. Question num 16,17 from exercises.

Chapter 13

Short question:

The reaction of a carboxylic acid with bases. Differentiate between aromatic carboxylic acid and fatty acids. Amino acids are amphoteric. Strecker synthesis. Differentiate between polypeptide and proteins. What are zwitterions? Prepare acetic acid from ethynes. Ester formation, acid halide, and amide formations. Reactions of acetic acids.

Chapter 14

Difference between addition and condensation polymerizations. POLYAMIDE resins . Disaccharide . Glycogen and starches. Denaturation and importance of protein . Specifications. Saponification numbers. Iodine numbers . Factors affecting enzymes . Steroids . Differentiate between DNA and RNA

Chapter 15

Macro and micronutrient.  Phosphorus ki importance and pralling . Raw materials for cement  Heating.

Chapter 16

Long question.

Components of the environment. Acid rain. Smog. Air pollution. DO,BOD,COD

Exercise: Q9 to Q1.