Class/Course - Class XI

Subject - Chemistry

Total Number of Question/s - 6390


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  • 1. Some Basic Concepts of Chemistry - Quiz

    1. An organic compound contains 4 sulphur . Its minimum molecular weight is
    a) 200
    b) 400
    c) 800
    d) 1600

    2. A person has as many notes as number of oxygen atoms in 24.8 g Na2S2O3.5 H2O (mol.wt. = 248). A note counting machine counts 48 million notes per day. How many days it would take to count these notes?
    a) 1012
    b) 1014
    c) 1016
    d) 1018

  • 2. Structure of Atom - Quiz

    1. Which of the following is true?
    a) The ionisation energy of a hydrogen-like species in its ground state is equal to the magnitude of energy of the orbit having n = 1.
    b) The ionisation energy of a hydrogen-like species in its ground state increases in proportion to the positive charge in its nucleus
    c) According to the uncertainty principl$\Delta p \Delta x \le \frac{h}{4\pi}$.
    d) The energy of an electron in an orbital of a multielectron atom depends only on the principle quantum numbers n.

    2. In Rutherford scattering experiment, if lithium metal is used in place of thin foil of gold, no scattering will be observed.
    a) True
    b) False

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

    1. Which of the following is incorrect?
    a) An element has high electronegativity always has high electron gain enthalpy
    b) Electron gain enthalpy is the property of an isolated atom
    c) Electronegativity is the property of bonded atom
    d) Both electronegativity and electron gain enthalpy are usually directely related to nuclear charge and inversely related to atomic size

    2. The electronic configuration of the element with atomic number 58 is _______it belongs ___________block elements.
    a) 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4f1 5s2 5p6 5d1 6s2, d-block elements.
    b) 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4f1 5s2 5p6 5d2 6s1, d-block elements.
    c) 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4f1 5s2 5p6 5d4 6s2, d-block elements.
    d) 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4f1 5s2 5p6 5d3 6s2, d-block elements.

  • 4. Chemical Bonding and Molecular Structure - Quiz

    1. Which of the following has greater bond length?
    a) P-O
    b) S-O
    c) Cl-O
    d) O=O

    2. The dipole moment of is 1.5 D. The dipole moment of is
    a) 1.5 D
    b) 2.25 D
    c) 1 D
    d) 3 D

  • 5. States of Matter - Quiz

    1. In which one of the following does the given amount of chlorine gas exert the least pressure in a vessel of cap[acity 1 dm3 at 273 K?
    a) 0.0355 g
    b) 0.071 g
    c) 6.023 x 1021 molecules
    d) 0.02 mole

    2. When two ice-cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together?
    a) Dipole forces
    b) Van der Waals forces
    c) Covalent forces
    d) Hydrogen bond forces

  • 6. Thermodynamics - Quiz

    1. The following two reactions are known
    Fe2O3(s) + 3 CO(g) →2 Fe(s) + 3 CO2(g) ; Δ H = - 26.8 kJ
    FeO(s) + CO(g) → Fe(s) + CO2(g) ; ΔH = - 16.5 KJ
    The value of ΔH; for the following reaction
    Fe2O3(s) + CO(g)→ 2 FeO(s) + CO2(g) is
    a) + 10.3 kJ
    b) -43.3 KJ
    c) -10.3 KJ
    d) + 6.2 KJ

    2. During complete combustion of one mole of butane, 2658 kJ of heat is released. The thermochemical reaction for above change is
    a) 2 C4H10 (g) + 13 O2 (g)   →   8 CO2(g) + 10H2O(l) ΔH = -2658.0 kJ mol-1
    b) C4H10(g) + (13/2) O2 (g)   →   4CO2(g) + 5H2O(g) ΔH = -1329.0 kJ mol-1
    c) C4 H10 (g) + (13/2)O2 (g)   →    4 CO2 (g) + 5 H2O(l) ΔH = -2658.0 kJ mol-1
    d) C4H10(g) + (13/2) O2 (g)   →   4 CO2 (g) + 5 H2O (l) Δ H = +2658.0 kJ mol-1

  • 7. Equilibrium - Quiz

    1. Determine the pH of the solution that results from the addition of 20.00 mL of 0.01 M Ca(OH)2 to 30.00 mL of 0.01 M HCI
    a) 11 .30
    b) 10.53
    c) 2.7
    d) 8.35

    2. 2.5 mL of 2.5 M weak monoacidic base (Kb = 1 x 10-12 at 250C) is titrated with (2/15) M HCI in water at 250C. The concentration of H+ at equivalence points is (Kw = 1 x 10-14 at 250C)
    a) 3.7 x 10-13 M
    b) 3.2 x 10-7 M
    c) 3.2 x 10-2 M
    d) 2.7 x 10-2

  • 8. Redox Reactions - Quiz

    1. For decolourisation of 1 mol of KMnO4 , the moles of H2O2 required is
    a) 1/2
    b) 3/2
    c) 5/2
    d) 7/2

    2. The largest oxidation number exhibited by an element depends on its outer electronic configuration. With which of the following outer electronic configuration the element will exhibit largest oxidation number?
    a) 3 d1 4s2
    b) 3d3 4s2
    c) 3 d5 4s1
    d) 3d5 4s2

  • 9. Hydrogen - Quiz

    1. Hydrogen can be placed in group 17 of the periodic table because
    a) hydrogen forms hydrides like NaH
    b) hydrogen has isotopes D and T
    c) it is light
    d) hydrogen combines with halogens

    2. Consider the following reactions:
    I : AIH3 + H- → AIH-4
    II : H2 O + H- → H2 + OH-
    Select the correct statement from the following :
    a) H- is a Lewis acid in I and Lewis base in II
    b) H- is a Lewis base in I and Bronsted base in II
    c) H- is a Lewis acid in I and Bronsted base in II
    d) H- is a Lewis base in I and II

  • 10. The s-Block Elements - Quiz

    1. A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is
    a) Magnesium nitrate
    b) Calcium nitrate
    c) Barium nitrate
    d) Strontium nitrate

    2. A compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO2 is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid C on gentle heating gives back A. The compound is
    a) CaCO3
    b) Na2CO3
    c) K2CO3
    d) CaSO4.2 H2O

  • 11. The p-Block Elements - Quiz

    1. Aluminium forms [AIF6]3- but boron forms [BF4]-.
    a) Tru
    b) Fals

    2. BF3 exists as discrete molecules but AICI3 exists as a dimer.
    a) Tru
    b) Fals

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

    1. The increasing order of stability of the following free radicals is
    a) (CH3)2 < (CH3)3C < (C6H5)2CH < (C6H5)3C
    b) (C6H5)3C < (C6H5)2CH < (CH3)3)C < (CH3)2CH
    c) (C6H5)2CH < (C6H5)3C < (CH3)3C < (CH3)2CH
    d) (CH3)2CH <(CH3)3 C < (C6H5)3C < (C6H5)2CH

    2. The IUPAC name of the following compound is

    a) 4-Bromo-3-cyanophenol
    b) 2-Bromo-5-hydroxybenzonitrile
    c) 2-Cyano-4-hydroxybromobenzene
    d) 6-Bromo-3-hydroxybenzonitril

  • 13. Hydrocarbons - Quiz

    1. Which of the following reactions of methane is incomplete combustion:
    a)
    b)
    c) CH4 + 02 →C(s) + 2 H2O (l)
    d) CH4 + 2O2 →Co2(g) + 2 H2O (l)

    2. Which of the following compounds is not aromatic?
    a)
    b)
    c)
    d)

  • 14. Environmental Chemistry - Quiz

    1. Pick up the correct statement:
    a) CO which is a major pollutant resulting from the combustion of fuels in automobiles plays a major role in photochemical smog.
    b) Classical smog has an oxidizing character while the photochemical smog is reducing in character.
    c) Photochemical smog ocuurs in day time whereas the classical smog occurs in the morning hours.
    d) During formation of smog the level of ozone of ozone in the atmosphere goes down.

    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. In a chemical reaction, equilibrium is said to have been established when the
    a) Concentration of reactants and products are equal
    b) Opposing reaction ceases
    c) Velocities of opposing reaction become equal
    d) Temperature of opposing reaction are equal

    2. According to Le chatliers principle, adding heat to a solid liquid in equilibrium will cause the
    a) Amount of solid to decrease
    b) Amount of liquid to decrease
    c) Temperature to rise
    d) Temperature to fall

  • 16. Ionic Equlibrium - Quiz

    1. At what pH will a 10-3M solution of indicator with Kb = 10-10 changes colour?
    a) 10
    b) 4.0
    c) 3
    d) 7

    2. Ka for the reaction;
    Fe3+(aq) + H2O (l) $\rightleftharpoons$ Fe(OH)2+(aq) + H3O(aq)
    is 6.5 x 10-3, what is the maximum pH value could be used so that at least 80% of the total iron (III) in a dilute solution exists as Fe3+ ?
    a) 2
    b) $\sim$ 2.4
    c) $\sim$ 2.8
    d) $\sim$ 1.6

  • 17. Alkanes and Cycloalkanes - Quiz

    1. In the free-radical chlorination of methane, the chain initiation step involves the formation of
    a) HCl
    b)
    c)
    d)

    2. Which of the following reactions will not give propane?
    a)
    b)
    c)
    d)

  • 18. Alkenes and Alkadienes - Quiz

    1. What is the wrong statement?
    a) In oxymercuration and demercuration reaction, alcohol is formed by Markonvikov addition.
    b) In hydroboration oxidation reaction , alcohol is formed by anti-Merkonikov addition.
    c) Regiospecificity of HBO reaction is syn.
    d) Regispecificity of oxymervuration and demercuration reaction is anti and rearrangement occurs.

    2.
    Which statement is correct about (A) and (C) ?
    a)
    b)
    c)
    d)

  • 19. Alkynes - Quiz

    1.
    Products P,Q and R are :

    a) P ⇒ I,O and R ⇒ II
    b) P and Q both I and II, R ⇒ II
    c) P is both I and II, Q and R ⇒ II
    d) P,Q and R → All II

    2.
    Products A, B, C, D, E and F, respectively , are:

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

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

    1. Mixture of CaCN2 and C is called
    a) Barytes
    b) Anhydride
    c) Nitrolim
    d) Iceland spar

    2. The following compounds have been arranged in order of their increasing stabilities. Identify the correct order.
    K2CO3 (I) MgCO3 (II)
    CaCO3 (III) BeCO3 (IV)
    a) I < II < III < IV
    b) IV < II < III < I
    c) IV < II < I < III
    d) II < IV < III < I

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

    1. C60 can be regarded as a huge ball made up of:
    a) Several conjugated alkene units rather than an aromatic molecule
    b) Graphite units
    c) Several aromatic benzene molecules
    d) Several tetradrons

    2. The anhydride of carbonic acid is:
    a) CO
    b) CO2
    c) C3O2
    d) none of these

  • 22. Classification & Nomenclature of Organic Compounds - Quiz

    1. The number of σ - and π - bonds in 5-oxohexanoic acid, respectively is:
    a) 18, 2
    b) 18, 1
    c) 17, 2
    d) 17, 1

    2. Which of the following is correctly named?
    a)
    b)
    c)
    d)

  • 23. Quantitative & Qualitative Analysis - Quiz

    1. A compound contains C = 90% and H = 10%. Empirical formula of the compound is:
    a) C15 H30
    b) C15 H20
    c) C3 H4
    d) C3 H10

    2. 0.3 hm of platinichloride of an organic diacidic base left 0.09 gm of platinum on ignition. The molecular weight of the organic base is:
    a) 120
    b) 240
    c) 180
    d) 60

  • 24. Isomerism - Quiz

    1. Which of the following statements is correct?
    a) The presence of chiral carbon is essential condition for enantiomerism.
    b) Functional isomerism is a kind of sterreoisomerism.
    c) The compounds containing one chiral carbon only are always chiral.
    d) All statements are wrong

    2. The IUPAC name of its compound with formuls CnH2n+2, having the lowest possible molecular mass and capable of showing enantiomerism is:
    a) 3-Methyl hexane
    b) 2,3-Dimethyl pentane
    c) Methane
    d) Both (a) and (b)

  • 25. General Organic Chemistry - Quiz

    1. The decreasing order of -I effect of the following is : $R_{4}N^{\oplus }$ II. NO2 III. CN IV. SO3H V. COOH
    a) I > II > III > IV > V
    b) II > I > III > IV > V
    c) I > II > III > V > IV
    d) II > I > V > IV > III

    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.
    Which statement is correct about the above reaction?
    a) Product (B) is (I) by SN1 mechanism.
    b) Product (B) is (II) by SN2 mechanism
    c) Product (B) is (I) by SN2 mechanism
    d) Product (B) is (II) by SN1 reaction

    2. In which of the following reactions, SN2 rate increases on changing the solvent from (95% acetone + 5% H2O) to (80% acetone + 20% H2O)?
    a)
    b)
    c)
    d)