Class/Course - Class XI

Subject - Chemistry

Total Number of Question/s - 6390

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  • 1. Some Basic Concepts of Chemistry - Quiz

    1. 36.5% HCl has density equal to 1.20 g mL-1. The molarity (M) and molality (m), respectively, are:
    a) 15.7,15.7
    b) 12,12
    c) 15.7, 12
    d) 12,15.7

    2. Calculate the number of oxygen atoms required to combine with 7.0g of N2 to form N2O3 if 80% of N2 is converted into products.
    $N_{2} + \frac{3}{2}O_{2} \rightarrow N_{2}O_{3}$
    a) 3.24 x 1023
    b) 3.6 x 1023
    c) 18 x 1023
    d) 6.02 x 1023

  • 2. Structure of Atom - Quiz

    1. The energy of an electron in the first Bohr orbit of H atom is -13.6 eV. The possible energy value(s) of the excited state(s) for electrons in Bohr orbits of hydrogen is (are)
    a) -3.4 eV
    b) -4.2 eV
    c) -6.8 eV
    d) +6.8 eV

    2. Limiting line of any spectral series in the hydrogen spectrum is the line when n2 in the Rydberg formula is____________.
    a) external
    b) Infinity
    c) both
    d) none

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

    1. Consider the isoelectronic species, Na+ , Mg2+ , F- and O2-. The correct order of increasing length of their radii is_____________.
    a) F- < O2- < Mg2+ Na+
    b) Mg2+ < Na+ < F- < O2-
    c) O2- < F- < Na+ < Mg2+
    d) O2- < F- < Mg2+ < Na+

    2. Which of the following remains unchanged on descending a group in the periodic table
    a) Valence electrons
    b) Atomic size
    c) Density
    d) Metallic character.

  • 4. Chemical Bonding and Molecular Structure - Quiz

    1. In case of alkali metals, the covalent character decrease in the order
    a) MF > MCI > MBr > MI
    b) MF > MCl > MI > MBr
    c) MI > MBr > MCl > MF
    d) Mcl > MI > MBr > MF

    2. The species having pyramidal shape is
    a) SO3
    b) BrF3
    c) SiO32-
    d) OSF2

  • 5. States of Matter - Quiz

    1. A vessel is filled with a mixture of oxygen and nitrogen . At what ratio of partial pressures will the mass of gases be idenstical?
    a) P(O2) = 0.785P(N2)
    b) P(O2) = 8.75P(N2)
    c) P(O2) = 11.4P(N2)
    d) P(O2) = 0.875P(N2)

    2. In the van der waals equation
    a) b is the volume occupied by the gas molecules
    b) b is four times the volume occupied by the gas molecules
    c) b is the correction factor for intermolecular attraction
    d) None of these

  • 6. Thermodynamics - Quiz

    1. ΔE is always positive when
    a) System absorbs heat and work is done on it
    b) System emits heat and work is done on it
    c) System emits heat and no work is done on it
    d) System absorbs heat and work is done by it

    2. The molar enthalpies of combustion of C2H2(g), C(graphite) and H2(g) are -1300 , -394 and -286 kJ mol-1, respectively . The standard enthalpy of formation of C2H2(g) is
    a) -226 kJ mol-1
    b) -626 kJ mol-1
    c) 226 kJ mol-1
    d) 626 kJ mol-1

  • 7. Equilibrium - Quiz

    1. What will be the value of pH of 0.01 mol dm-3 CH3COOH (Ka = 1.74 x 10-5)?
    a) 3.4
    b) 3.6
    c) 3.9
    d) 3

    2. The solubility product of AgCI is 4.0 x 10-10 at 298 K. The solubility of AgCI in 0.04 m CaCI2 will be:
    a) 2.0 x 10-5 m
    b) 1.0 x 10-4 m
    c) 5.0 x 10-9 m
    d) 2.2 x 10-4 m.

  • 8. Redox Reactions - Quiz

    1. Two electrochemical cells, Zn | Zn2+ || Cu2+ |Cu and Fe | Fe2+ || Cu2+ | Cn are connected in series. What will be the net e.m.f. of the cell at 250 C?
    Given : Zn2+ | Zn = - 0.76 V, Cu2+ | Cu = + 0.34 V, Fe2+ | Fe = - 0.41 V
    a) + 1.85 V
    b) - 1.85 V
    c) + 0.83 V
    d) - 0.83 V

    2. Which of these will not be oxidised by ozone?
    a) KI
    b) FeSO4
    c) KMnO4
    d) K2MnO4

  • 9. Hydrogen - Quiz

    1. Hydrogen peroxide was first time prepared by
    a) Gay-Lussac
    b) Priestley
    c) Thenard
    d) Bernard

    2. The radioactive isotope of hydrogen is called___________and its nucleus contains __________proton and _____________neutrons.
    a) One, two, tritium
    b) Tritium , one , two
    c) Two , one, tritium
    d) None of these

  • 10. The s-Block Elements - Quiz

    1. One mole of magnesium nitride on reaction with an excess of water gives
    a) One mole of ammonia
    b) One mole of nitric acid
    c) Two moles of ammonia
    d) Two moles of nitric acid

    2. A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to its disinfectant nature. What is the chemical formula of A?
    a) Ca(HCO3)2
    b) CaO
    c) Ca(OH)2
    d) CaCO3

  • 11. The p-Block Elements - Quiz

    1. Dry ice is
    a) Solid NH3
    b) Solid SO2
    c) Solid CO2
    d) Solid N2

    2. Which one of the following has highest Lewis acid strength?
    a) BI3
    b) BBr3
    c) BF3
    d) BCI3

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

    1. The IUPAC name of

    a) N-Cyclohexylbenzamide
    b) N-Phenyl-N- cyclohexylmethanamide
    c) N-Phenylcyclohexanearcarboxamide
    d) N-Cyclohexyl-N-phenylmethanamide.

    2. Cycloheptatrienyl cation is a non-benzenoid aromatic compund.
    a) True
    b) False

  • 13. Hydrocarbons - Quiz

    1. Arrange the following carbanions in order of their decreasing stability.
    (A) H3C―C≡ C-
    (B) H―C≡C-
    (C )H3C―CH2-
    a) A > B > C
    b) B > A > C
    c) C > B > A
    d) C > A> B

    2. Intramolecular dehydration of alcohols is carried out with____________ to give ___________ .
    a) conc. H2SO4, alkenes
    b) conc. H2SO4, alkynes
    c) dil. H2SO4, alkenes
    d) None of these

  • 14. Environmental Chemistry - Quiz

    1. The inflow of nutrients from fertilizers into lakes resulting in the increases of phosphate in lake water and depletion of dissolved oxygen causing the fish to die is called___________.
    a) Eutrophication
    b) Biomagnification
    c) Disease
    d) None of these

    2. Which of the following is not a greenhouse gas?
    a) Methane
    b) Ozone
    c) Carbondioxide
    d) Nitrogen

  • 15. Chemical Equlibrium - Quiz

    1. In the dissociation of PCl5 as
    $PCl_{5} \rightleftharpoons PCl_{3}\left (g \right ) + Cl_{2} \left (g \right )$
    if the degree of dissociation is α at equilibrium pressure P, then the equilibrium constant for the reaction is
    a) $K_{P}$ = $\frac{\alpha^{2}}{1 + \alpha^{2}P}$
    b) $K_{P}$ = $\frac{\alpha^{2}P^{2}}{1 - \alpha^{2}}$
    c) $K_{P}$ = $\frac{P^{2}}{1 - \alpha^{2}}$
    d) $K_{P}$ = $\frac{\alpha^{2}P}{1 - \alpha^{2}}$

    2. For the reaction , H2(g) + I2(g) $\rightleftharpoons$ 2HI(g), the equilibrium constant Kp changes with
    a) Total pressure
    b) Catalyst
    c) The amounts of H2 and I2 present
    d) Temperature

  • 16. Ionic Equlibrium - Quiz

    1. Which of the following salts undergoes anionic hydrolysis?
    a) CuSO4
    b) NH4Cl
    c) FeCl3
    d) Na2CO3

    2. The pH of a slution is 5.00 . To this solution, sufficient acid is added to lower the pH to 2.00. The corresponding increase in H3O ion concentration is
    a) 1000 times
    b) 2.5 times
    c) 100 times
    d) 5 times

  • 17. Alkanes and Cycloalkanes - Quiz

    1. Consider the following reaction:

    Compound (B) is :

    2. The total number of isomers including stereisomers for 1,2-Dimethyl cyclobutane is :
    a) 2 , one cis and one trans (both optically inactive)
    b) 3, one cis and two optically active trans form
    c) 3, one trans and two optically active cis forms
    d) 4, two cis (optically active) and two trans (optically active_

  • 18. Alkenes and Alkadienes - Quiz

    d) All

    The final product (E) is:

  • 19. Alkynes - Quiz

    A, B and C are :

    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. The hydration enthalpy of Mg2+ is greater than
    a) Al3+
    b) Na
    c) Ca2+
    d) Sr2+

    2. Be and Al exhibits many properties which are similar. But the two elements differ in
    a) Forming covalent bonds
    b) Forming polymeric hydrides
    c) Exhibiting maximum covalency in compounds
    d) Exhibiting amphoteric nature in their oxides

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

    1. Which of these is not a monomer for a high molecular mass silicone polymer?
    a) Me3SiCl
    b) PhSiCl3
    c) MeSiCl3
    d) Me2SiCl2

    2. Carbon suboxide C3O2(O = C = C = C = O) is obtained as a colourless gas by the dehydration of malonic acid with
    a) Conc H2SO4
    b) H3PO4
    c) P4O10
    d) All

  • 22. Classification & Nomenclature of Organic Compounds - Quiz

    1. A compound (A) with molecular formula C5 H10 gives one monochlorination product. Compound (A) is:

    2. Which of the following is not the name of CH3 NC?
    a) Methyl isocyanide
    b) Aceto isonitrile
    c) Methyl carbylamine
    d) Acetonitrile

  • 23. Quantitative & Qualitative Analysis - Quiz

    1. In Liebigs method for the estimation of C and H, if the compound also contains halogens, which of the following is kept near the exit of the combustion tube?
    a) Silver wire
    b) PbCrO4
    c) Both (a) and (b)
    d) Cu gauge

    2. A compound contains 38.8% C, 16% H, and 45.2% N. The formula of the compound would be:
    a) CH3 NH2
    b) C2 H5 CN
    c) CH3 CN
    d) CH2 (NH2) 2

  • 24. Isomerism - Quiz

    1. Five compounds with formula C4H8Br2.
    How many structures of (X) are possible?
    a) 2
    b) 3
    c) 4
    d) 5

    2. Which of the following will not able to show optical isnomerism (enatiomerism)?
    a) 1,2-Propadiene
    b) 2,3-Pentadiene
    c) sec-Butyl alcohol
    d) All exhibit enationmerism

  • 25. General Organic Chemistry - Quiz

    1. The increasing order of pKb value of the following is:

    a) IV < III < II < I
    b) I < II < III < IV
    c) IV < II < III < I
    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. Which statement is correct about the following reaction?

    a) Major product is (I) and minor product is (II) by SN1 mechanism.
    b) Major product is (I) and minor product is (II) by SN2 mechanism
    c) Major product is (II) and minor product is (I) by SN1 mechanism
    d) Major product is (II) and minor product is (I) by SN2 mechanism.

    Reagent I and II, respectively are
    a) $OsO_{4}/NaHSO_{3},MMPP/H_{2}O$
    b) Cold alkaline $KMnoO_{4}, OsO_{4}/NaHSO_{3}$
    c) $PhCO_{3}H/H_{2}O$, Cold alkaline $KMnO_{4}$
    d) $MMPP/H_{2}O, HCO_{3}/H_{2}O$