12th Chemistry Additional Important 2,3 & 5 Marks

5 Marks : Appeared Once In Question Paper

  • Extraction of copper from copper pyrites?Ln1 pg8
  • How will you prepare producer gas?Ln2 Pg43
  • What happens when borax is heated?Pg34 Ln2
  • Write a note on metallic nature of p-block elements. Q11 Ln2
  • Why does bleeding stop by rubbing moist alum? Pg 40 Ln2
  • Give one example for each of the following Ln 2 Q10
  • Write the molecular formula and structural formula for the following molecules. BB14 (1) Ln3
    •  a) Nitric acid b) dinitrogen pentoxide c) phosphoric acid d) phosphine
  • Give a reaction between nitric acid and a basic oxide.Q18 Ln3
  • Write the structure of marshall’s acid? Ln3 Pg81
  • List out the uses of potassium di chromate?Ln4(1)
  • State Hume – Rothery rule?Ln4 Pg111
  • Describe the nature of bonding in metallic carbonyls?(1) Ln5
  • Write the expression for the solubility product of Hg2cl2?(1) Ln8
  • Establish a relationship between the solubility product and molar solubility for the following a) BaSO b) Ag (CrO ) Example 8.10 Pg26 ln8
  • Describe the construction of Daniel cell. Write the cell reaction.?BB6 (1) Ln9
  • Various application of colloids?Ln10 Pg98
  • How colloids are used in tanning of leather and in Rubber industry?(1) Ln10
  • What are promoters?Pg79(1) Ln10
  • Write a note on electrophoresis?Ln10 Pg94
  • What is brownian movement?ln10 Pg 93
  • Explain williamson’s synthesis with mechanism?(1) Ln11
  • What is baeyer’s reagent? How it is useful to convert ethane to ethane-1,2-diol?Ln11(1) Ln11
  • Anisole – Halogenation , Nitration?Ln11 Pg138
  • Write any three electrophilic substitution of phenol(Nitrosation,Nitration,Halogenation,Sulphonation)Ch11 Pg128
  • What is the action of HCN on Ln12 Q8
  • benzoin condensation reaction?Ln12 Pg164
  • Why ionic crystals are hard and brittle?Q13 Ln6
  • Reduction of nitro benzene under different conditions?pg204(1) Ln13
  • What are vitamins? give two examples?(1) Ln14
  • Classify the following into monosaccharides, oligosaccharides and polysaccharidesLn14  Q11
  • What are called antacids?Give example?(1)
  • Classify the following as linear, branched or cross linked polymers BB17(1)
  • a) Bakelite b) Nylon-6,6 c) LDPE d) HDPE

3 Marks : Appeared Once In Question Paper

  • Preparation of phosphine by using caustic soda(NAOH)?pg68(1)Ln3
  • Describe the position of f block elements in the periodic table?Pg118(1)Ln4
  • Out of Lu(OH)3 and La(OH)3 which is more basic and why?Q19 Ln4
  • Why do zirconium and Hafnium exhibit similar properties?Q21 Ln4
  • Imperfections in solid play an important role in various process.Justify?Ln6 Pg192
  • How do concentrations of the reactant influence the rate of reaction?Q21 Ln7
  • How does ethane-1,2-diol react with anhydrous zncl2 under pressure?(1)  Ln8
  • Define ionic product of water. Give its value at room temperature. ?Ln8 Q10
  • Derive an expression for the hydrolysis constant and degree of hydrolysis of salt of strong acid and weak base?Ln8 Q18
  • Mention the anode,Cathode,Electrolyte and the uses of mercury button cell?(1) Ln9
  • Write a notes on Helmholt’s electriccal double layer?(1) Ln10
  • Explain the characterisics of a catalyst?(1)Pg78 Ln10
  • Define Heterogeneous catalysis?Pg77(1) Ln10
  • Peptising agent is added to convert precipitate into colloidal solution. Explain with an example. Q6 Ln10
  • Write note on emulsions,types of emulsions and any two uses of emulsion?Ln10 Pg97
  • Explain Freundlich adsorption isotherm?Ln10 Pg74
  • what is optimum temperature in enzyme catalysed reaction?pg84(1) Ln10
  • Identify the enzyme catalyst in the following reactions?Pg83(1) Ln10
    • Oxidation of ethanol into acetic acid
    • Hydrolysis of starch into maltose
    • Hydrolysis of urea
  • How do you prepare the following? A)Picric acid B)TNGLn11(1) Ln 11
  • What is the major product obtained when 2,3 – dimethyl pentan -3 – ol is heated in the presence of H S2 4 O .Pg117 Evaluate Ln 11
  • What is Glycerose ? How is it formed?Ln11 pg121
  • Explain the coupling reaction of phenol?Ln11 Pg131
  • Action of con h2so4 on glycol?Ln11 Pg120
  • Conversion of ethyl alcohol to ethene?Ln11 pg115 Elimination reaction  | Ethylene glycol to Ethanal 
  • Uses of carboxylic acids and its derivatives?(1) Ln12
  • What is Perkins reaction?Ln12 Pg165
  • Reducing action of formic acid?Ln12 Pg177
  • How will you prepare propan – 1- amine from Ln13 Q10
  • What happens when i. 2 – Nitropropane boiled with HCl ii. Nitrobenzene undergo electrolytic-reduction in strongly acidic medium Ln13 Q3
  • Explain Levine and Hauser acetylation?Ln13 Pg225
  • Write a note on denaturation of proteins ?Q8 Ln14
  • What is called Mutarotation?Ln14 Pg244
  • Uses of teflon?Ln15 Pg288
  • Convert the following : A.Methyl acetate – ethyl acetate B.Benzaldehyde to Malachite green dye C.Ethane Nitrile to Ethanal

2 Marks : Appeared Once In Question Paper

  • How copper matte is formed? (Ln1 – 1)
  • How bleaching powder is prepared? (Ln3 – 1)
  • Why HF cannot be stored in glass bottles?Ln3 Pg88
  • What is Bayer’s reagent? (Ln4 – 1)
  • Mention the conditions of formation of alloys?Ln4 Pg111
  • Write the IUPAC name of the following compounds. (Ln5 – 1)
  • Explain coordination isomerism with example. (Ln5 – 1)
  • Write IUPAC ligand name for the following. (Ln5 – 1)
  • Define central atom in coordination compounds. (Ln5 – 1)
  • Write the formula of zeise’s salt and Magnu’s green salt?Ln5 Pg136
  • What is linkage isomerism? (Ln5 – 1)
  • What are “F” Centres?Ln Pg194
  • If 6 close packed spheres, calculate octahedral & tetrahedral voids. (Ln6 – 1)
  • Radius of sodium atom in BCC structure calculation. (Ln6 – 1)
  • Acidic nature of HClO₄ – Bronsted Lowry theory. (Ln8 – 1)
  • Define buffer solution. (Ln8 – 1)
  • Why conductivity decreases on dilution? (Ln9 – 1)
  • Silver nitrate electrolysis calculation. (Ln9)
  • Calculate EMF of Zn|Zn²⁺ || Cu²⁺|Cu cell. (Ln9)
  • Factors affecting adsorption. (Ln10 – 1)
  • Catalytic poisons with example. (Ln10 – 1)
  • Negative catalysis. (Ln10 – 1)
  • Why lyophilic sols are more stable than lyophobic sols? (Ln10)
  • Product of 1-methoxypropane with HI. (Ln11 – 1)
  • Glycerol reaction with KHSO₄. (Ln11 – 1)
  • Saponification reaction. (Ln11 – 1)
  • Rosenmund reduction reaction. (Ln12 – 1)
  • Popoff’s rule. (Ln12 – 1)
  • Convert acetone to propane. (Ln12 – 1)

Compulsory Additional

Q1.The time for half change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant. How much of A will be left after 180 seconds?Ln7 Q25

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