Class/Course - Class XII

Subject - Chemistry

Total Number of Question/s - 4730


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  • 1. The Solid State - Quiz

    1. An ionic solid A⊕$B^{\circleddash}$ crystallizes as a bcc structure. The distance between cation and anion in the lattice is 338 pm. The edge length of cell is
    a) 338 pm
    b) 390.3 pm
    c) 292.7 pm
    d) 507 pm
    2. Na and Mg crystallize in bcc- and fcc-type crystals, respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystal is
    a) 4 and 2
    b) 9 and 14
    c) 14 and 9
    d) 2 and 4
  • 2. Solutions - Quiz

    1. The boiling point of an azeotropic mixture of water and ethyl alcohol is less than that of the theoretical value of water and alcohol mixture. Hence the mixture shows
    a) The solution is highly saturated
    b) Positive deviation from Raoult law
    c) Negative deviation from Raoult law
    d) Nothing can be said
    2. Blood has been found to be isotonic with
    a) Normal saline solution
    b) Saturated NaCl solution
    c) Saturated KCl solution
    d) saturated solution of a 1:1 mixture of NaCl and KCl
  • 3. Electrochemistry - Quiz

    1. In passing 3F of electricity through three electrolytic cells connected in series containing Ag⊕, Ca2+ and Al3+ ions, respectively. The molar ratio in which the three metal ions are liberated at the electrodes is
    a) 1:2:3
    b) 2:3:1
    c) 6:3:2
    d) 3:4:2
    2. The increases in the molar conductivity of HCl with dilutiuon is due to
    a) Increase in the self ionization of water
    b) Hydrolysis of HCl
    c) Decrease in the self ionization of water
    d) Decreases in the interionic forces
  • 4. Chemical Kinetics - Quiz

    1. The activation energy for a hypothetical reaction A → X is 12.49 kcal mol-1. If temperature is raised to 305 from 295K , the reaction rate increased by 0.002 kcal K-1 mol-1 is almost equal to
    a) 60%
    b) 50%
    c) 100%
    d) Unpredictable
    2. Consider the reaction
    N2(g) + 3H2(g) → 2NH3(g)
    the equality relationship between $\frac{d[NH_{3}]}{dt}  and  -\frac{d[H_{2}]}{dt}$ is
    a) $\frac{d[NH_{3}]}{dt} = -\frac{1}{3}\frac{d[H_{2}]}{dt}$
    b) $+\frac{d[NH_{3}]}{dt} = -\frac{2}{3}\frac{d[H_{2}]}{dt}$
    c) $+\frac{d[NH_{3}]}{dt} = -\frac{3}{2}\frac{d[H_{2}]}{dt}$
    d) $\frac{d[NH_{3}]}{dt} = -\frac{d[H_{2}]}{dt}$
  • 5. Surface Chemistry - Quiz

    1. The stabilization of a dispersal phase in a lyophobic colloid is due to
    a) The adsorption of charged substance on dispersed phase
    b) The large electro-kinetic potential developed in the colloid
    c) The formation of an electrical layer between two phases
    d) The viscosity of the medium
    2. Gold number of a lyophilic sol is such a property that
    a) The larger its value, the greater is the peptizing power
    b) The lower its value, the greater is the peptizing power
    c) The lower its value, the greater is the protecting power
    d) The larger its value, the greater is the protecting power.
  • 6. General Principles and Processes of Isolation of Elements - Quiz

    1. CO on passing over heated nickel gives
    a) Ni(CO)4
    b) NiCO3
    c) CO + H2
    d) CO2 + H2
    2. Bauxite ore is made up of Al2O3 + SiO2 + TiO2 + Fe2O3. This ore is treated with conc. NaOH solution at 500 K and 35 bar pressure for a few hours and filtered hot. In the filtrate, the species present are
    a) NaAl(OH)4 only
    b) Na2 Ti(OH)6 only
    c) NaAl(OH)4 and Na2SiO3 both
    d) Na2SiO3 only
  • 7. The p-Block Elements - Quiz

  • 8. The d-and f-Block Elements - Quiz

    1. Percentage of gold in 21.6 carat gold is
    a) 21.80%
    b) 90%
    c) 10%
    d) 70%
    2. The colour of FeF3 is
    a) Brown
    b) Red brown
    c) Light brown
    d) White
  • 9. Coordination Compounds - Quiz

    1. The closed ring compounds formed by bisdentate ligands, on binding to a metal or metal ions are called:
    a) Monodentate ligand
    b) Chelates
    c) Ambidentate
    d) None of these
    2. In which of the following pairs both the complexes show optical isomerism?
    a) cis-[Cr(C2O4)2Cl2]3-, cis-[Co(NH3)4Cl2]
    b) [Co(en)3]Cl3, cis-[Co(en)2Cl2Cl
    c) [Co(NO3)3(NH3)3], cis-Pt(en)2Cl2
    d) [PtCl(en)Cl], [NiCl2Br2]2-
  • 10. Haloalkanes and Haloarenes - Quiz

  • 11. Alcohols, Phenols and Ethers - Quiz

    1. Which of the following structure represents Vanillin?
    a)
    b)
    c)
    d)
    2. Which is the best method for the conversion of (A) pentan-3-ol to 3-bromopentane?
    a)
    b)
    c) $\left ( A \right )\overset{HBr}{\rightarrow}\left ( B \right )$
    d) Both (a) and (b)
  • 12. Aldehydes, Ketones and Carboxylic Acids - Quiz

    1. In the following reaction, product P is
    p
    a) RCH2OH
    b) RCCOH
    c) RCHO
    d) RCH3
    2. The relative reactivities of acyl compounds towards nucleophilic substitution  are in the order of
    a) acyl chloride > acid anhydride > ester > amide
    b) ester > acyl chloride > amide > acid anyhydride
    c) acid > anyhydride > amide > ester > acyl chloride
    d) acyl chloride > ester > acid anyhydride > amide
  • 13. Amines - Quiz

  • 14. Biomolecules - Quiz

    1. Which structural feature distinguishes proline from other natural α-amino acids?
    a) It is optically inactive.
    b) It contains aromatic group.
    c) It is a dicarboxylic acid
    d) It has a secondary amine.
    2. Which is the correct statement?
    a) Starch is a polymer of α-glucose
    b) Amylose is a component of cellulose.
    c) Proteins are composed of only one type of amino acids.
    d) In cyclic structure of furanose, there are four carbon atoms and one oxygen atom.
  • 15. Polymers - Quiz

  • 16. Chemistry in Everyday Life - Quiz

  • 17. Nuclear Chemistry - Quiz

    1. In which of the following the magic numbers of both protons and neutrons are present
    a) 15Sn123
    b) 82Pb208
    c) 82Pb206
    d) 50Sn118
    2. The number of protons and neutrons for most stable element is
    a) Even -odd
    b) Even-even
    c) Odd-odd
    d) Odd-even
  • 18. p-Block Group 16 Elements (Oxygen Family) - Quiz

    1. Oxalic acid when heated with conc. H2SO4 it gives out
    a) H2O and CO2
    b) Oxalic sulphate
    c) CO2 and H2S
    d) CO and CO2
    2. Catalyst used in contact process is
    a) Platinised asbestos (Badiche process)
    b) Vanadium pentaoxide
    c) Finely divided platinum deposited on magnesium sulphate (Grillo process)
    d) All
  • 19. p-Block Group 17 Element (Halogen Family) - Quiz

    1. Mark the strongest reducing agent.
    a) H2F2
    b) HCl
    c) HBr
    d) HI
    2. The strongest oxidising agent among the following is
    a) Ozone
    b) Oxygen
    c) Fluorine
    d) Chlorine
  • 20. p-Block Group 18 Element (Inert Gases) - Quiz

    1. Which statement about noble gases is not correct?
    a) Xe forms XeF6
    b) Ar is used in electric bulbs
    c) Kr is obtaind during radioactive disintegration
    d) He has the lowest boiling point among all the noble gases
    2. Helium is used in gas balloons instead of hydrogen because
    a) it is higher than H2
    b) it is non-combustible
    c) it is more abundant than H2
    d) its linkage can be detected easily
  • 21. Grignard Reagents & Organometallic Compounds - Quiz

    1. Ethyl ester $\xrightarrow[excess]{MeMgBr}P$. The product P will be:
    a)
    b)
    c)
    d)
    2. Reactivity of with the following G.R. in the decreasing order is:
    (i). MeMgBr (ii) EtMgBr
    (iii) Me2Ch-MgBr (iv)Me3C-MgBr
    a) (i) > (ii) > (iii) > (iv)
    b) (iv) > (iii) > (ii) > (i)
    c) (i) > (ii) > (iv) > (iii)
    d) (iv) > (ii) > (iii) > (i)
  • 22. Oxydation 7 Reduction of Organic Compounds - Quiz

    1. Compound (A) $\xrightarrow[HIO_{4}]{2 \ mol \ of}$ 2 mol of glyoxalic acid. The compound (A) is:
    a)
    b)
    c)
    d)
    2. Which of the following reactions is correct?
    a)
    b)
    c)
    d)
  • 23. Aliphetic & Aromatic Aldehyde and Ketones - Quiz

    1. On treatment of acetone with dilute Ba(OH)2, the product formed is:
    a) Aldol
    b) Phorone
    c) Propionaldehyde
    d) 4-Hydroxy-2-pentanone
    2. Fluorobenzee (C6H5F) can be by synthesised in the laboratory:
    a) By heating phenol with HF and KF.
    b) From aniline by diazotisation followed by heating the diazonium salt with HBF4.
    c) By direct fluorination of benzene with F2 gas.
    d) By reacting PhBr with NaF solution.
  • 24. Carboxlic Acid & Its Derivatives - Quiz

    1. Which of the following tests would help in the distinction of HCOOH and CH3COOH?
    a) Treatment with Tollens reagent
    b) Treatment with NaOH
    c) Treatment with Na
    d) Formation of their respective amides
    2. CH3CH = CHCHO is oxidised to CH3CH = CHCOOH using:
    a) Alkaline KMnO4
    b) Selenium dioxide
    c) Ammoniacal AgNO3
    d) All
  • 25. Organic Compounds with Functional Group - Quiz

    1. When PhNO2 is reduced in alkaline medium, the product is:
    a)
    b) Ph-N=N-Ph (Azobenzene)
    c) Ph-NH-NH-Ph (Hydrazobenzene)
    d) All
    2. A nitrogenous substance (X) is treated with HNO2 and the product so formed is further treated with NaOH solution, which produces blue colouration. Which of the following can (X) be?
    a) CH3CH2NH2
    b) CH3CH2NO2
    c) CH3CH2ONO
    d) (CH3)2CHNO2
  • 26. Synthetic and Natural Polymer - Quiz

    1. Nylon-6 is prepared from:
    a) Adipic acid and hexamethylene diamine
    b) Caprolactum
    c) Urea and formaldehyde
    d) None of these
    2. The repeating units of PTFE are:
    a) Cl2CH - CH3
    b) F2C = CF2
    c) F3C - CF3
    d) FCIC = CF2
  • 27. p-Block Group 15 Elements (Nitrogen Family - Quiz

    1. Conc. HNO3 stains and wood yellow because
    a) The wood is burned by acid
    b) Nitrocellulose is formed
    c) The proteins are converted into xanthoproteins
    d) The water is removed acid
    2. It is recommended that ammonia bottles be opened after cooling in ice for sometime. This is because
    a) It brings tears to eyes
    b) It has high vapour pressure
    c) It is corrosive liquid
    d) It is mild explosive