Important Questions for Class 12 Chemistry

Important Questions CBSE Class 12 Chemistry Chapter 14 – Biomolecules

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1.Give some examples of bimolecules Ans. Examples of biomolecules – carbohydrates, proteins, Nucleic acids, Lipids, enzymes etc. 2.What are carbohydrates? Ans. Carbohydrates are optically active polyhydroxy aldehydes or ketones or the compounds which produce such units on hydrolysis. 3.Give one example of each- Monosaccharide, disaccharide and polysaccharide Ans. Monosaccharide – Glucose, Fructose etc. Disaccharide – Sucrose, maltose etc. … Read more

Important Questions for CBSE Class 12 Chemistry Chapter 13 – Amines 1 Mark Questions

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For an amine RNH2, write an expression to indicate its basic strength. Ans. 2. Give one use of quaternary ammonium salts. Ans. Quaternary ammonium salts are widely used for manufacture of synthetic detergents. 3. Give one example of Hoffmann – Bromamide reaction Ans. In Hoffmann – Bromamide reaction an acid amide is reacted with Bromine in presence … Read more

NCERT Solutions For Class 12 Chemistry Chapter 1 The Solid State

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NCERT TEXTBOOK QUESTIONS SOLVED 1.1.Why are solids rigid?Ans: The constituent particles in solids have fixed positions and can oscillate about their mean positions. Hence, they are rigid. 1.2.Why do solids have a definite volume?Ans: The constituent particles of a solid have fixed positions and are not free to move about, i.e., they possess rigidity. That is why … Read more

Important Questions Class 12 Chemistry Chapter 8 The d and f Block Elements 1 Mark Questions

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1. Zinc, cadmium and mercury are not considered as transition metals. Why? Ans. Zinc, cadmium and mercury have fully filled configuration. Therefore they are not considered as transition metal. 2. Write the general configuration of d- block elements. Ans. General electronic configuration of d- block elements is. 3. What are the factors that decide the ionization potential? Ans.The … Read more

Important Questions Class 12 Chemistry Chapter 7 The p-Block Elements 1 Mark Questions

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1. Write the elements of group 15? Ans. The elements of group 15 are Nitrogen (N), Phosphorous (P) , Arsenic (As) , Antimony (Sb) and Bismuth (Bi). 2.  Write chemical name & formulae of a) Chile saltpetre b) Indian saltpetre Ans. (a) Chile saltpetre – Sodium nitrate –  (b) Indian saltpetre – Potasium nitrate –  3.  … Read more

Important Questions CBSE Class 12 Chemistry Chapter 9 Coordination Compounds 1 Marks Questions

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1. What is the shape of Iron pentacarbonyl? Ans.  Geomectry = Trigonal bipyramidal/span> 2. What do you understand by stability of a complex and instability constant of coordination compounds? Ans. The stability of a complex in solution is the degree of association between the two species involved in the state of equilibrium. The instability constant is … Read more

Important Questions Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements 1 Mark Questions

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1. What is pig iron? Ans. The iron which is obtained from blast furnace and contains about 4% carbon and many other impurities in smaller amounts like S, P, Si, Mn etc, is called pig iron. 2.  What is cast iron? Ans. Iron obtained by melting pig iron with scrap iron and coke using hot air blast … Read more

Important Questions Class 12 Chemistry Chapter 5 Surface Chemistry 1 Mark Questions

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1. What do you mean by the term –Adsorption ? Ans.  The accumulation of molecular species at the surface rather than in bulk of a solid liquid is termed as Adsorption. 2. Explain the terms – Adsorbate and Adsorbent with examples Ans. The molecular species which get concentrated or accumulated at the surface are adsorbate eg. etc. … Read more

Important Questions Class 12 Chemistry Chapter 4 Chemical Kinetics 1 Mark Questions

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1. Is rate of reaction always constant? Ans. No. rate of a reaction is not always constant. It depends on many factors such as concentration, temperature etc. 2. Can order of reaction be zero? Give example. Ans. Yes, decomposition of ammonia on a hot platinum surface is a zero order of reaction at high pressure. 3. What … Read more

Important Questions Class 12 Chemistry Chapter 3 Electrochemistry 1 Mark Questions

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1. Can you store AgCl solution in Zinc pot? Ans. No. We can’t store AgCl solution in Zinc pot because standard electrode potential of Zinc is less than silver. 2. Define the term – standard electrode potential? Ans. When the concentration of all the species involved in a half-cell is unity, then the electrode potential is called … Read more

Important Questions Class 12 Chemistry Chapter 2 Solutions 1 Mark Questions

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1. Define the term –solubility? Ans. The maximum amount of a substance that can be dissolved in a specified amount of solvent is called its solubility. 2. What is the effect of pressure on solubility of a gas? Ans. The solubility of a gas increases with increases of pressure. 3. State Henry’s Law. Ans. Henry’s Law states that … Read more

Important Questions Class 12 Chemistry Chapter 12 – Aldehydes Ketones and Carboxylic Acids 1 Mark Questions

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1. Give one use of Formalin. Ans. Formalin is used as a disinfectant, preservative for biological specimens and in leather industry. 2. What is the chemical name of Tollen’s reagent and Fehling’s solution. Ans. Tollen’s reagent  = Ammoniacal Silver Nitrate Fehlings solution =  Sodium Potassium Tartarate. 3. Write the structure of alkenes that on ozonolysis will … Read more

Important Questions Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers 1 Mark Questions

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1. Write IUPAC names of :- i.  Ans. 5 – Methyloctan-3-ol ii.  Ans. 1-Chloro propan-2-ol iii.  Ans. Pentan – 1,3,4 – triol iv.  Ans. 2 – Methylpropan -2-ol v.  Ans. 1,3 – Dibromo – 4- chloro – 2- butanol vi.  Ans. 5 – Chloro – 4 – ethyl – 5- methyl hexanol. vii.  Ans. 2 – Phenyl ethanol viii.  Ans. 2- Methyl phenol. … Read more

Important Questions Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes 1 Mark Questions

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1. Give IUPAC names of following compounds (i). (ii). (iii). (iv). (v).   (vi). (vii).  (viii). (ix). (x). Ans. (i). 1, 3- Dibromobutane (ii). 1- Cholopropan-2-ol(iii). 2, 3 – Dibromo-1-chloro-3-methylpentane(iv). 2-Choloro-3-ethyl-2-methyl pentane(v). 1-Chloro-2-phenylethane(vi). 1-Chloro-1-phenyl ethane(vii). 1, 2, 3, 4, 5, 6- hexachlorocyclohexane(viii). 2, 2- Dihexyl 1, 1, 1-Trichloro ethane(ix). 4, 4-dibromobiphenyl(x). 1, 3-Dibromo -3- methyl … Read more

Important Questions for CBSE Board Exams (Chemistry)

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This section will be updated regularly. Stay tuned!!! Q.1) Which point defect in crystals does not alter the density of the relevant solid? Answer: Frenkel defect. Q.2) Define the term ‘Tyndall effect’. Answer: The scattering of light by colloidal particles is known as Tyndall effect. Q.3) Why is the froth floatation method selected for the … Read more

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