Class/Course - Class XI

Subject - Chemistry

Total Number of Question/s - 6390


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  • 1. Some Basic Concepts of Chemistry - Quiz

    1. 10mL of 1M BaCl2 solution and 5mL, 0.5 M K2SO4 are mixed together to precipitate out BaSO4. The amount of BaSO4 precipitated will be
    a) 0.005 mol
    b) 0.00025 mol
    c) 0.025 mol
    d) 0.0025 mol

    2. One amu (or u) has mass equal to__________kg.
    a) 1.66 x 10-25 kg
    b) 1.66 x 10-27 kg
    c) 1.66 x 10-26 kg
    d) 1.66 x 10-24 kg

  • 2. Structure of Atom - Quiz

    1. Which one of the following options does not represent ground state electronic configuration of an atom?
    a) 1 s2 2s2 2p6 3s2 3p6 3d8 4s2
    b) 1 s2 2s2 2p6 3s2 3p6 3d9 4s2
    c) 1 s2 2s2 2p6 3s2 3p6 3d10 4s1
    d) 1 s2 2s2 2p6 3s2 3p6 3d5 4s1

    2. Which of the following is false?
    a) The d orbitals are no more degenerate in the presence of a magnetic field
    b) The spin number was introduced to explain the splitting of spectral lines of hydrogen atom in the presence of a magnetic field
    c) Pauli exclusion exclusion principle is followed by fermions which have half integral spins.
    d) The energy of an orbital in an atom remains the same with increase in the positive charge in its nucleus.

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

    1. The highly metallic element will have the configuration of
    a) 2, 8, 7
    b) 2, 8, 8, 5
    c) 2, 8, 8, 1
    d) 2, 8, 2

    2. The correct sequence which shows decreasing order of the ionic radii of the element is
    a) O2- > F- > Na+ > Mg2+ > Al3+
    b) Al3+ > Mg2+ > Na+ > F- > O2
    c) Na+ > Mg2+ > Al3+ > O2- > F-
    d) Na+ > F- > Mg2+ > O2- > Al3+

  • 4. Chemical Bonding and Molecular Structure - Quiz

    1. Which one of the following species does not exit under normal conditions?
    a) Li2
    b) Be2 +
    c) Be2
    d) B2

    2. Which of the following contains both covalent and ionic bonds?
    a) CCl4
    b) CaCl2
    c) NH4Cl
    d) H2O

  • 5. States of Matter - Quiz

    1. What would be the ratio of mean square velocity of hydrogen gas at 50 K and that of oxygen gas at 800 K?
    a) 1
    b) 2
    c) 4
    d) 16

    2. The temperature at which the volume of a gas is zero is
    a) 00C
    b) 0 K
    c) 0 F
    d) None of these

  • 6. Thermodynamics - Quiz

    1. Consider the following reactions
    (i) H+(aq) + OH-(aq) = H2O(l)                         -x1 kJ mol-1
    (ii) H2(g) + $\frac{1}{2}$O2(g) = H2O (l)            x2 kJ mol-1
    (iii) CO2(g)+ H2(g) = CO(g) +H2O(l)               -x3 kJ mol-1
    (iv) C2H2 (g) + $\frac{5}{2}$O2 (g) + H2O (l)     +x4 kJ mol-1
    Enthalpy of formation of H2O (l) is
    a) -x2 kJ mol-1
    b) +x3 kJ mol-1
    c) -x4 kJ mol-1
    d) +x1 kJ mol-1

    2. On heating one end of a piece of metal, the other end becomes hot because of
    a) resistance of the metal
    b) mobility of atoms in the metal
    c) energised electrons moving to the other end
    d) minor perturbation in the energy of atoms

  • 7. Equilibrium - Quiz

    1. Sulphide ions in alkaline solution react with solid sulphur to form S2-2 and S2-3. The formation constants of S22 and S2-3 from S2- and S are 1.8 and 5.4 respectively. Formation constant of S2-3 from S2-2 and S is
    a) 1.8
    b) 5.4
    c) 9.72
    d) 3

    2. Choose the correct order arranged in decreasing order of basicity
    a) CH ≡ C- > CH3O- > OH-
    b) OH- > CH3 O- > CH ≡ C-
    c) CH3O- > OH- > CH ≡C-
    d) CH3O- > CH ≡ C- > OH-

  • 8. Redox Reactions - Quiz

    1. Which of the following is a redox reaction?
    a) NaCl + KNO3 → NaNO3 + KCl
    b) CaC2O4 + 2HCl → CaCl2 + H2C2O4
    c) Mg(OH)2 + 2NH4Cl → MgCl2 + 2NH4OH
    d) Zn + 2AgCN → 2Ag + Zn(CN)2

    2. In compounds, all the atoms of a particular element have the same oxidation number.
    a) True
    b) False

  • 9. Hydrogen - Quiz

    1. Given colourless liquid will be determined whether it is water or not?
    a) By smelling
    b) By tasting
    c) By phenolphthalein
    d) By adding a pinch of anyhydrous CuSO4

    2. In the reaction, H2S + H2O2 →S + 2H2O
    a) H2S is an acid H2O2 is a base
    b) H2S is a base and H2O2 is an acid
    c) H2S is an oxidising agent and H2O2 is an oxidising agent
    d) H2S is hydrolysed to S

  • 10. The s-Block Elements - Quiz

    1. The set representeding the correct order of ionic radii is
    a) Na+ > Li+ > Mg2+ > Be2+
    b) Li+ > Na+ > Mg2+ > Be2+
    c) Mg2+ > Be2+ > Li+ > Na+
    d) Li+ > Be2+ > Na+ > Mg2+

    2. The melting points of the following halides follow the order
    a) LiCi < NaCl < KCI < RbCI
    b) RbCI < KCI < NaCI < LiCI
    c) LiCI < KCI < RbCI < NaCI
    d) LiCI < RbCI < KCI < NaCI

  • 11. The p-Block Elements - Quiz

    1. SnCI2 acts as a ____________--agent.
    a)
    b) Reducing
    d) None of these

    2. The B-F bond length is longer in [BF4]- than in BF3.
    a) Tru
    b) Fals

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

    1. Consider thiol anion (RSѳ) and alkoxy anion (ROѳ).Which of the following statement is correct?
    a) RSѳ is less basic and less nucleophilic than ROѳ
    b) RSѳ is less basic but more nucleophilic than ROѳ
    c) RSѳ is more basic and more nucleophilic than ROѳ
    d) RSѳ is more basic but less nucleophilic than ROѳ

    2. The IUPAC name of

    a) 1, 1-dimethyl-3-bromoethyl-5-chloropentane
    b) 3-bromomethyl-1-chloro-5-methylhexane
    c) 1-bromomethyl-1-2-chloroethyl-4-methylpentane
    d) 4-bromomethyl-1-chloro-6-methylheptane

  • 13. Hydrocarbons - Quiz

    1. Enthalpy of hydrogen of cyclohexene is-119.5 kJ mol-1. If resonance energy of benzene is-150.4 kJ mol-1, its enthalpy of hydrogen would be
    a) -358.5 kJ mol-1
    b) -508.9 kJ mol-1
    c) -208.1 kJ mol-1
    d) -269.9 kJ mol-1

    2. The Z-isomer among the following is
    a)
    b)
    c)
    d)

  • 14. Environmental Chemistry - Quiz

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

    2. Which one of the following statement is not true?
    a) Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant
    b) pH of drinking water should be between 5.5-9.5
    c) Concentration of DO below 6 ppm is good for the growth of fish
    d) Clean water would have a BOD value of less than 5 ppm

  • 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. 1 mol of N2 is mixed with 3 mol of H2 in a litre container. If 50% of N2 is converted into ammonia by the reaction N2(g) + 3H2(g) $\rightleftharpoons$ 2NH3(g), then the total number of moles of gas at the equilibrium are
    a) 1.5
    b) 4.5
    c) 3.0
    d) 6.0

  • 16. Ionic Equlibrium - Quiz

    1. Auto-ionisation of liquid NH3 is
    $NH_{3} \rightleftharpoons NH_{4}^{\oplus} + NH_{2}^{\circleddash}$
    and KNH3 = $\left [NH_{4}^{\oplus} \right ] \left [NH_{2}^{\circleddash} \right ]$ = $10^{-30}$ at -500C
    Number of amide ions $ NH_{2}^{\circleddash}$, present per mm3 of pure liquid NH3 is
    a) 602
    b) 301
    c) 200
    d) 100

    2. In the third group of qualitative analysis, the precipitating reagent is NH4Cl/NH4OH. The function of NH4Cl is to
    a) Increase the ionisation of NH4OH
    b) Suppress the ionisation of NH4OH
    c) Convert the ions of group third into their respective chlorides
    d) Stabilise the hydroxides of group III cations

  • 17. Alkanes and Cycloalkanes - Quiz

    1. Arrange the following in the decreasing order of their boiling points:

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

    2. Octane number can be changed by:
    a) Alkulation
    b) Cyclisation
    c) Isomerisation
    d) All of these

  • 18. Alkenes and Alkadienes - Quiz

    1.
    The number of geometrical isomers of (A) can be:
    a) 2
    b) 3
    c) 4
    d) 5

    2.
    Compounds (B) and (C) are:
    a)
    b)
    c)
    d)

  • 19. Alkynes - Quiz

    1.
    Compounds (B) and (C) are:
    a)
    b)
    c)
    d) Both is (II) and (C) is (III)

    2.
    The intermediate species formed in the above reaction is:
    a)
    b)
    c)
    d)

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

    1. Magnesium is an important component of which biomolecule occuring extensively in living world?
    a) Haemoglobin
    b) ATP
    c) Chlorophyll
    d) Vitamin B12

    2. Shine at freshly cut sodium is because of
    a) Oscillations of free electrons
    b) Weak metallic bonding
    c) Absorption of light in crystal lattice
    d) Presence of free valency at the surface

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

    1. Which statement is not true about CO?
    a) It is colouless gas
    b) It is an odourless gas
    c) It is highly soluble in water
    d) It is poisonous gas

    2. What is the formula of carbon suboxide?
    a) CO
    b) CO2
    c) C2O4
    d) C3O4

  • 22. Classification & Nomenclature of Organic Compounds - Quiz

    1. The number of 10 , 20 , and 30 H atoms in 2,5,6-trimethyl octane, respectively, is:
    a) 16, 5, 3
    b) 15, 6, 3
    c) 16, 6, 3
    d) 15, 5, 2

    2. The systematic naming of the following cycloalkane is:

    a) 6-Methyl bicyclo [3.2.0] heptane
    b) 7-Methyl bicyclo [3.2.0] heptane
    c) 2-Methyl bicyclo [3.2.0] heptane
    d) 3-Methyl bicyclo [3.2.0] heptane

  • 23. Quantitative & Qualitative Analysis - Quiz

    1. 0.24 gm of a volatile liquid upon vaporisation given 45 ml of vapours at STP. What will be the vapour density of the substance? (Density of H2 = 0.089 gm litre-1)
    a) 9.539
    b) 59.93
    c) 5.993
    d) 95.39

    2. The empirical formula of an organic compound is CH2. The mass of 1 mol of it is 42 gm. The molecular formula of the compound is:
    a) C4 H8
    b) C2 H4
    c) C3 H6
    d) CH2

  • 24. Isomerism - Quiz

    1. The keto form of phenol contains:
    a) 3π, 13σ, 4 non-bonding electrons.
    b) 3π, 9σ, 4 non-bonding electrons
    c) 3π, 9σ 2 non-bonding electrons
    d) 3π , 8σ, 4 non-bonding electrons

    2. The degree of unsaturation or index of hydrogen deficiency in the following is:
    (i) C6H14 (ii) C4H6 (iii) C6H6
    a) 0,2,4
    b) 1,0,2
    c) 4,1,0
    d) 2,0,4

  • 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. Which of the following is a soft base ?
    a) CO
    b) $CO_{3}^{2-}$
    c) Cl3+
    d) Pb2+

  • 26. Organic Reaction & Mechanism - Quiz

    1. Arrange the following in the decreasing order of NA (nucleophilic addition) reaction.
    (I) MeCOMe (II) PhCOMe (III) PhCOPh (IV) PhCH2COMe
    a) (I) > (II) > (III) > (IV)
    b) (IV) > (III) > (II) > (I)
    c) (IV) > (I) > (II) > (III)
    d) (III) > (II) > (I) > IV)

    2. The decreasing order of dehydrohalogenation of the following compounds is:

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