Class/Course - Class XI

Subject - Chemistry

Total Number of Question/s - 6390


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  • 1. Some Basic Concepts of Chemistry - Quiz

    1. 3.28 of a sample of pure copper when heated in presence of oxygen for some time forms black copper oxide (CuO) which weighs 3.92 g. What approximate percent of copper remains unoxidized?
    a) 4.60%
    b) 5.60%
    c) 6.60%
    d) 7.60%

    2. 10g mixture of NaHCO3 and Na2CO3 has 1.68g NaHCO3. It is heated at 400K. Weight of the residue will be
    a) 9.38 g
    b) 8.32 g
    c) 10.0 g
    d) 1.68 g

  • 2. Structure of Atom - Quiz

    1. The orbital diagram in which the Pauli exclusion principle and Hund rule are violated is
    a)
    b)
    c)
    d)

    2. Which of the following set of quantum numbers represents the 19th electron in chromium (Z = 24 for Cr)
    a) 4, 0, 0, (1/2)
    b) 4, 1, -1, (1/2)
    c) 3, 2, 2, (1/2)
    d) 3, 2, -2, (1/2)

  • 3. Classification of Elements and Periodicity in Properties - Quiz

    1. The sizes of following species increase in the order:
    a) Mg2+ < Na+ < F- < Al
    b) F- < Al < Na+ < Mg2+
    c) Al < Mg2+ < F- < Na+
    d) Na+ < Al < F- < Mg2+

    2. The order of which of the following oxides is arranged according to decreasing basic nature?
    a) Na2O, MgO , Al2O3, CuO
    b) CuO, Al2O3, MgO, Na2O
    c) Al2O3, CuO, MgO, Na2O
    d) CuO, MgO, Na2O, Al2O3

  • 4. Chemical Bonding and Molecular Structure - Quiz

    1. Which of the following conditions is not correct for resonating structures?
    a) The contributing structures must have the same number of unpaired electrons
    b) The contributing structures should have similar energies.
    c) The contributing structures should be so written that unlike charges reside on atoms that are far apart
    d) The positive charge should be present on the electropositive element and the negative charge on the electronegative element.

    2. Orthonitrophenol is steam volatile but paranitrophenol is not because
    a) Orthonitrophenol has intramolecular hydrogen bonding while paranitrophenol has intermolecular hydrogen bonding
    b) Both ortho and paranitrophenol have intramolecular hydrogen bonding
    c) Orthonitrophenol has intermolecular hydrogen bonding and paranitrophenol has intramolecular hydrogen bonding
    d) van der waals forces are dominant in orthonitrophenol

  • 5. States of Matter - Quiz

    1. At what temperature will the total kinetic energy of 0.30 mol of He be same as the total kinetic energy of 0.40 mol of Ar at 400 K?
    a) 400 K
    b) 300 K
    c) 533 K
    d) 573 K

    2. 600 cc of a gas at a pressure of 750 mm is compressed to 500cc. Taking the temperature to remain constant, the increase in pressure is
    a) 150 mm
    b) 250 mm
    c) 350 mm
    d) 450 mm

  • 6. Thermodynamics - Quiz

    1. Assume each reaction is carried out in an open container. For which reaction will ΔH = ΔE?
    a) H2(g) +Br2(g) → 2HBr(g)
    b) C(s)+2H2O(g) → 2H2 (g) +CO2(g)
    c) PCl5(g) → PCl3(g) + Cl2(g)
    d) 2CO(g) + O2(g) → 2CO2(g)

    2. Formation of ozone takes place as
    O2 (g) +O (g) →O3 (g), ΔH0 = -107.2 kJ
    Assuming O=O bond energy as 498.8 kJ mol-1, the average bond energy of ozone is :
    a) 391.6 kJ mol-1
    b) 606.0 kJ mol-1
    c) 107.2 kJ mol-1
    d) 302.6 kJ mol-1

  • 7. Equilibrium - Quiz

    1. How much sodium acetate should be added to 0.1 m solution of CH3COOH to give a solution of pH 5.5 (pKa of CH3COOH = 4.5)
    a) 0.1 m
    b) 0.2 m
    c) 1.0 m
    d) 10.0 m

    2. pH of a solution of CuSO4 is___________ than 7 and that of solution of Na2CO3 is ___________than 7.
    a) greater, lesser
    b) less, greater
    c) less, lesser
    d) none of these

  • 8. Redox Reactions - Quiz

    1. A cell is constructed by coupling the two electrodes Sn/Sn2+ and Cu/Cu2+ . If E0 (Sn2+ , Sn), E0 (Cu2+, Cu) and E0 cell are - 0.14 V, 0.34 V and 0.48 V respectively, the correct representation of the cell is
    a) Sn (s) | Sn2+ (0.1 M) || Cu2+ (1.0 M ) | Cu (s)
    b) Sn (s) | Sn2+ (1.0 M )|| Cu (1.0 M) | Cu (s)
    c) Sn (s) | Sn2+ (1.0 M) || Cu2+ (1.0 M) | Cu (s)
    d) Cu (s) | Cu2+ (1.0 M) || Sn2+ (1.0 M) | Sn (s)

    2. The number of moles of KMnO4 reduced by 1 mol of KI in alkaline medium is
    a) 1
    b) 2
    c) 5
    d) 1/5

  • 9. Hydrogen - Quiz

    1. In which of the following reaction dihydrogen acts as an oxidising agnt?
    a) Ca + H2 → CaH2
    b) 2H2 + O2 → 2H2O
    c) H2 + F2 → 2HF
    d) 2CuO + H2 → Cu + H2O

    2. In the following reaction using isotope 18O in H2O2.
    2MnO-4 + 3H2O2 → 2MnO2 + 3O2 + 2H2O + 2OH-
    Isotopic oxygen goes:
    a) Both in O2
    b) Both in MnO2
    c) Both in OH-
    d) One in O2 and one in MnO2

  • 10. The s-Block Elements - Quiz

    1. In curing cement plasters, water is sprinkled from time to time. This helps in
    a) Converting sand into silic acid
    b) Keeping it cool
    c) Developing interlocking needle like crystals of hydrated silicates
    d) Hydrating sand and gravel mixed with cement

    2. Alkali metals react with water virgorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?
    a) Li
    b) Na
    c) K
    d) Cs

  • 11. The p-Block Elements - Quiz

    1. Which one of the following has lowest m.pt.?
    a) B
    b) Tl
    c) Al
    d) Ga

    2. The chief impurity present in bauxite is
    a) SiO2
    b) Fe2O3
    c) K2SO4
    d) NaF

  • 12. Organic Chemistry – Some Basic Principles and Techniques - Quiz

    1. The shape of CH3- is__________while that of CH3+ is_______________
    a) Planar, Pyramidal
    b) Pyramidal, planar
    c) Tripyramidal, planar
    d) Pyramidal, trogonal planar

    2. Paper chromatography is also called ____________ chromatography in which _______ constitutes the stationary phase while a __________ constitues the mobile phase.
    a) Partition or liquid/liquid, water chemically bound to paper, mixture of solutes
    b) Partition or liquid/liquid, water physically bound to paper, mixture of solvents
    c) Partition or liquid/liquid, water chemically bound to paper, mixture of solvents
    d) None of these

  • 13. Hydrocarbons - Quiz

    1. Which one of the following is most reactive towards electrophilic reagent?
    a)
    b)
    c)
    d)

    2. In presence of UV light, benzene reacts with chlorine forming ___________ .
    a) Benzene hexachloride
    b) Benzene trichloride
    c) Benzene chloride
    d) Benzene dichloride

  • 14. Environmental Chemistry - Quiz

    1. Which of the following is true about photochemical smog?
    a) It is reducing in nature
    b) It is formed in winter
    c) It is a mixture of smoke and fog
    d) It causes irritation in eyes

    2. Which of the following is true about photochemical smog?
    a) It is reducing in nature
    b) It is formed in winter
    c) It is a mixture of smoke and fog
    d) It causes irritation in eyes

  • 15. Chemical Equlibrium - Quiz

    1. For the reaction
    CO2(g) + H2O(g) $\rightleftharpoons$ CO2 (g) + H2(g)
    at a given temperature, the equilibrium amount of CO2(g) can be increased by
    a) Adding a suitable catalyst
    b) Adding an inert gas
    c) Decreasing the volume of the container
    d) Increasing the amount of CO(g)

    2. For a hypothetical reaction of the kind
    AB2(g) $\frac{1}{2}$B2(g) $\rightleftharpoons$ AB3(g); ΔH = -xkJ
    More AB3 could be produced at equilibrium by
    a) Using catalyst
    b) Removing some of B2
    c) Increasing the temperature
    d) Increasing the pressure

  • 16. Ionic Equlibrium - Quiz

    1. pH of an aqueous solution of 0.6 M NH2 and 0.4 M NH4Cl is 9.4 (pKb = 4.74). The new pH when 0.1 M Ca(OH)2 solution is added to it
    a) 9.86
    b) 9.53
    c) 9.7
    d) 9.4

    2. Fear or excitement, generally cause on to breathe rapidly and it results in the decrease of CO2 concentration in blood. In what way will it change the pH of blood?
    a) pH will increase
    b) pH will decrease
    c) No change
    d) pH will adjust to 7

  • 17. Alkanes and Cycloalkanes - Quiz

    1. The compound having only primary hydrogen atom is:
    a) Butane
    b) Isobutane
    c) Cyclohexane
    d) 2,2-Dimethyl butane

    2. Which of the statements is/are true about the reactivity of halogenation of alkanes? The reactivity order is F2 > Cl2 > Br2 > I2.
    Lower the activation energy for the chain initiation step, more reactive is the halogen.
    II. Lower the activation energy for the first chain propagation step, more reactive is the halogen.
    III. More negative is the overall herat of the reaction (ΔHr0) of halogenation of alkane, more reactive is the halogen.
    IV. Lower the activation energy for the second chain-propagation step, more reactive is the halogen
    a) (I),(II),(III)
    b) (I),(III)
    c) (II),(III),(IV)

  • 18. Alkenes and Alkadienes - Quiz

    1. Arrange the following compounds in the decreasing order of acidic charcter.
    I. Butane II. But-I-ene
    III. But-1-yne IV. Butan-1-ol
    a) (I) > (II) > (III) > (IV)
    b) (IV) > (II) > (III) > (I)
    c) (IV) > (III) > (II) > (I)
    d) (I) > (III) > (II) > (IV)

    2.
    Compound (B) is:
    a)
    b)
    c)
    d) All

  • 19. Alkynes - Quiz

    1.
    The major amount of (C) is :
    a)
    b)
    c)
    d)

    2.
    A, B and C are :

    a) (I),(II), and (III)
    b) (II),(I), and (III)
    c) (II),(III) and (I)
    d) (I),(III), and (II)

  • 20. s-Block Elements (Alkaline Earth Metal) - Quiz

    1. Which of the following decomposes at highest temperature?
    a) SrCO3
    b) BaCO3
    c) CaCO3
    d) MgCO3

    2. Typical elements is the name is given to the elements of
    a) Zero group
    b) Group 2
    c) 2nd and 3rd period
    d) Group 1

  • 21. p-Block Group 14 (Carbon Family) - Quiz

    1. Which of the following oxides has a three-dimensional structure?
    a) CO
    b) CO2
    c) SiO2
    d) SO2

    2. SiO4]4- has a tetrahedral structure. The silicate formed by using three oxygen has a
    a) Linear polymeric structure
    b) Three-dimensional structure
    c) Pyrosilicate structure
    d) Two-dimensional sheet structure

  • 22. Classification & Nomenclature of Organic Compounds - Quiz

    1. The systematic nomenclature of the following spirocompound is:

    a) 2-Methyl spiro [3.4] octane
    b) 3-Methyl spiro [3.4] octane
    c) 6-Methyl spiro [3.4] octane
    d) 7-Methyl spiro [3, 4] octane

    2. Which group is always taken as a substituent in the IUPAC system of nomenclature?
    a) -NO2
    b) -C$\equiv$N
    c)
    d) -NH2

  • 23. Quantitative & Qualitative Analysis - Quiz

    1. The empricial formula of a compound is CH2 O and its vapour density is 30. The molecular formula of the compound is:
    a) C3 H6 O3
    b) C2 H4 O2
    c) CH2O
    d) C2 H6 O3

    2. 0.5 gm of an organic substance containing phosphorous was heated with cone. HNO3 in the Carius tube. The phosphoric acid thus formed was precipitated with magnesia maxture (MgNH4 PO4) which on ignition gave a residue of 1.0 gm of magnesium pyrrophosphate (Mg2 P2 O7). The percentage of phosphorous in the organic compound is:
    a) 55.85%
    b) 29.72%
    c) 19.18%
    d) 20.50%

  • 24. Isomerism - Quiz

    1. Predict the number of stereoisomers for 2,5-heptadiene.
    a) 4
    b) 3
    c) 2
    d) 5

    2. Mesotartaric acid is optically inactive due to the presence of
    a) Geometrical isomerism
    b) Two chiral carbon atoms
    c) Molecular symmetry
    d) External compensation

  • 25. General Organic Chemistry - Quiz

    1. The decreasing order of basic characters of the following is :
    I. Aniline II. O-Nitroaniline
    III. M-Nitroaniline IV. P-Nitroaniline
    a) I > II > III > IV
    b) IV > III > II > I
    c) I > III > IV > II
    d) I < III < II < IV

    2. Arrange of the following in their decreasing order of acidity.


    a) III > IV > I > II
    b) I > II > III > IV
    c) IV > III > II > I
    d) II > III > I > IV

  • 26. Organic Reaction & Mechanism - Quiz

    1. Equal amount of an RCl(C4H9Cl) is reacted at the same temperature with equal volume of 0.2M and 0.4M solution of KOH, respectively , in two separate experiments. The time taken for the reaction of 50% of (C4H9Cl) was found to be same, the alkyl halide is :
    a)
    b)
    c)
    d)

    2. Necessary conditions for Diels-Alder reactions are:
    (I) Non-linearity of dienes
    (II) S-cis conformation of dienes
    (III) Dienes with EDG and dienophile with EWG groups
    (IV) Dienes with EWG and sienophile with EGDs group
    a) (I), (II), (III)
    b) (I), (II), IV)
    c) (II), (III)
    d) (II), (IV)