Total Number of Question/s - 3530

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  • 1. Some Basic Concepts of Chemistry - Quiz


    SAMPLE QUESTIONS


    1. The number of oxygen atoms in 4.4g of CO2 is
    a) 1.2 × 1023
    b) 6 × 1022
    c) 6 × 1023
    d) 12 × 1023

    2. The total number of valence electrons in 4.2g of $N_{3}^{-}$ ion is (NA is the avagadro number)
    a) 2.1 NA
    b) 4.2 NA
    c) 1.6 NA
    d) 3.2 NA

  • 2. Atomic Structure - Quiz


    SAMPLE QUESTIONS


    1. If uncertainty in position and momentum are equal than uncertainty in velocity is
    a) $\frac{1}{2m}\sqrt{\frac{h}{\pi}}$
    b) $\sqrt{\frac{h}{2\pi}}$
    c) $\frac{1}{m}\sqrt\frac{h}{\pi}$
    d) $\sqrt{\frac{h}{\pi}}$

    2. The maximum number of electrons in a subshell is given by the expression
    a) 4l-2
    b) 4l+2
    c) 2l+2
    d) 2n2

  • 3. Chemical Bonding - Quiz


    SAMPLE QUESTIONS


    1. Which one of the following has the highest dipole moment?
    a) AsH3
    b) SbH3
    c) PH3
    d) NH3

    2. For two ionic solids CaO and KI, identify the wrong statement among the following?
    a) Lattice energy of CaO is much larger than that of KI
    b) KI is soluble in benzene
    c) KI has lower melting point
    d) CaO has higher melting point

  • 4. Solutions - Quiz


    SAMPLE QUESTIONS


    1. 1.00 g of a non-electrolyte solute (molar mass 250 g mol-1) was dissolved in 51.2 g of benzene. If the freezing point depression constant , kf of benzene is 5.12 K kg mol-1 , the freezing point of benzene will be lowered by
    a) 0.4 K
    b) 0.3K
    c) 0.5K
    d) 0.2K

    2. The volume strength of 1.5 N H2O2 solution is
    a) 4.8
    b) 5.2
    c) 8.4
    d) 8.8

  • 5. States of Matter - Quiz


    SAMPLE QUESTIONS


    1. In a face centered cubic lattice, a unit cell is shared equally by how many unit cells?
    a) 8
    b) 4
    c) 2
    d) 6

    2. Van der Waals real gas, act as an ideal gas, at which condition?
    a) High temperature, low pressure
    b) Low temperature, high pressure
    c) High temperature, high pressure
    d) Low temperature, low pressure

  • 6. Nuclear Chemistry - Quiz


    SAMPLE QUESTIONS


    1. A human body required the 0.01 M activity of radioactive substance after 24h. Half-life of radioactive substance is 6h. Then , injection of maximum activity of radioactive substance that can be injected will be
    a) 0.08
    b) 0.04
    c) 0.16
    d) 0.32

    2. In a radioactive decay, an emitted electron comes from
    a) the nucleus of the atom
    b) the orbit with principal quantum number 1
    c) the inner orbital of the atom
    d) the outermost orbit of the atom

  • 7. Chemical Equilibrium - Quiz


    SAMPLE QUESTIONS


    1. The dissociation constants for acetic acid and HCN at 250C are 1.5 × 10-5 and 4.5 × 10-10, respectively. The equilibrium constant for the equilibrium ,
    CN- + CH3COOH HCN + CH3COO-
    would be
    a) 3.0 × 105
    b) 3.0 × 10-5
    c) 3.0 × 10-4
    d) 3.0 × 104

    2. The rate constants for forward and backward reaction of hydrolysis of ester are 1.1 × 10-2 are 1.5 × 10-3 per minute. Equilibrium constant for the reaction
    CH3COOC2H5 + H+     CH3COOH + C2H5OH is
    a) 4.33
    b) 5.33
    c) 6.33
    d) 7.33

  • 8. Ionic Equilibrium - Quiz


    SAMPLE QUESTIONS


    1. The ionisation constant of ammonium hydroxide is 1.77 × 10-5 at 298K . Hydrolysis constant of ammonium chloride is
    a) 5.65 × 10-10
    b) 6.50 × 10-12
    c) 5.65 × 10-13
    d) 5.65 × 10-12

    2. The solubility product of a sparingly soluble salt AX2 is 3.2 × 10-11 . Its solubility (in mol/L ) is
    a) 5.6 × 10-6
    b) 3.1 × 10-4
    c) 2 × 10-4
    d) 4 × 10-4

  • 9. Thermodynamics - Quiz


    SAMPLE QUESTIONS


    1. What is the entropy change (in JK-1 mol-1 ) when one mole of ice is converted into water at 00C? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol-1 at 00C.)
    a) 2.198
    b) 21.98
    c) 20.13
    d) 2.013

    2. Given the following entropy values (in JK-1mol-1) at 298K and 1 atm : H2(g) : 130.6 , Cl2(g) : 223. 0, HCl (g) : 186.7. The entropy change (in JK-1 mol-1) for the reaction
    H2(g) , cl2 (g) → 2HCl(g), is
    a)  +540.3
    b) + 727.0
    c) -166.9
    d) +19.8

  • 10. Chemical Kinetics - Quiz


    SAMPLE QUESTIONS


    1. Select the rate law that corresponds to data shown for the following reaction
                           A+B → Products
    Exp.        [A]        [B]         Initial rate
      1          0.012     0.035         0.1
      2          0.024     0.070         0.8
      3          0.024     0.035         0.1
      4          0.012     0.070         0.8
    a) rate = k[B]3
    b) rate = k[B]4
    c) rate = k[A][B]3
    d) rate = k[A]2[B]2

    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) $\frac{d[NH_{3}]}{dt} = -\frac{d[H_{2}]}{dt}$

  • 11. Electrochemistry - Quiz


    SAMPLE QUESTIONS


    1. Equivalent conductance of NaCl, HCl and C2H5COONa at infinite dilution are 126.45, 426.16 and 91 ohm-1 cm2, respectively. The equivalent conductance of C2H5COOH is
    a) 201.28 ohm-1 cm2
    b) 390.71 ohm-1 cm2
    c) 698.28 ohm-1 cm2
    d) 540.48 ohm-1 cm2

    2. The efficiency of a fuel cell is given by
    a) ΔG/ΔS
    b) ΔG/ΔH
    c) ΔS/ΔG
    d) ΔH/ΔG

  • 12. Surface Chemistry - Quiz


    SAMPLE QUESTIONS


    1. During dialysis
    a) only solvent molecules can diffuse
    b) solvent molecules, ions and colloidal particles can diffuse
    c) all kinds of particles can diffuse through the semipermeable membrane
    d) solvent molecules and ions can diffuse

    2. Which one of the following forms micelles in aqueous solution above certain concentration?
    a) Urea
    b) Dodecyl trimethyl ammonium chloride
    c) Pyridinium chloride
    d) Glucose

  • 13. Metallurgical Operations, Hydrogen and its Compounds - Quiz


    SAMPLE QUESTIONS


    1. The metal of zone refining of metals is based on the principle of
    a) greater noble character of the solid metal than that of the impurity
    b) greater solubility of the impurity in the molten state than in the solid
    c) greater mobility of the pure metal than that of impurity
    d) higher melting point of the impurity than that of the pure metal

    2. Calgon used as a water softner , is
    a) Na2[Na4(PO3)6]
    b) Na4[Na2(PO3)6]
    c) Na4[Na4(PO4)5]
    d) Na4[Na2(PO4)6]

  • 14. Chemical Periodicity - Quiz


    SAMPLE QUESTIONS


    1. In the periodic table from left to right in a period, the atomic volume
    a) decreases
    b) increases
    c) remains same
    d) first decrease then increases

    2. Which one of the following arrangements does not truly represent the property indicated against it?
    a) Br2 < Cl2 < F2 : Oxidising power
    b) Br2 < Cl2 < F2 : Electronegativity
    c) Br2 < F2 < Cl2 : Electron affinity
    d) Br2 < Cl2 < F2 : Bond energy

  • 15. Comparative Study of Elements - Quiz


    SAMPLE QUESTIONS


    1. The correct order of acid strength is
    a) HClO < HClO2 < HClO3 < HClO4
    b) HClO4 < HClO < HClO2 < HClO3
    c) HClO2 < HClO3 < HClO4 < HClO
    d) HClO4 < HClO3 < HClO2 < HClO

    2. Which of the following species has four lone pairs of electrons?
    a) I
    b) O-
    c) Cl-
    d) He

  • 16. d- and f-Block Elements - Quiz


    SAMPLE QUESTIONS


    1. In which of the following compounds transition metal has zero oxidation state?
    a) [Fe(CO)5]
    b) NH2.NH2
    c) NOClO4
    d) CrO5

    2. The common oxidation states of Ti are
    a) +2,+3
    b) +3,+4
    c) 3,-4
    d) +2,+3,+4

  • 17. Coordination Compounds - Quiz


    SAMPLE QUESTIONS


    1. Among [Ni(CO)4], [Ni(CN4]2+ , [NiCl4]2+ species, the hybridisation states of the Ni atom are, respectively (At no of Ni = 28)
    a) sp3,dsp2dsp2
    b) sp3,dsp2,sp3
    c) sp3,sp3,dsp2
    d) dsp2, sp3,sp3

    2. The number of geometrical isomers of the complex [Co(NO2)3(NH3)3] is
    a) 4
    b) 0
    c) 2
    d) 3

  • 18. Chemical Analysis - Quiz


    SAMPLE QUESTIONS


    1. An organic compound containing C, H and N gave the following results on analysis C = 40%, H = 13.33% , N = 46.67%. Its empirical formula would be
    a) C2H7N2
    b) CH5N
    c) CH4N
    d) C2H7N

    2. In steam distillation of toluene, the pressure of toluene in vapour is
    a) equal to the pressure of barometer
    b) less than the pressure of barometer
    c) equal to vapour pressure of toluene in simple distillation
    d) more than vapour pressure of toluene in simple distillation

  • 19. General Organic Chemistry - Quiz


    SAMPLE QUESTIONS


    1. Which of the following undergoes nucleophilic substitution exclusively by SN I mechanism?
    a) Benzyl chloride
    b) Ethyl chloride
    c) Chlorobenzene
    d) Isopropyl chloride

    2. The incorrect IUPAC name is
    a)

    b)

    c)

    d)


  • 20. Hydrocarbons - Quiz


    SAMPLE QUESTIONS


    1. Acetylenic hydrogens are acidic because 
    a) sigma electron density of C-H bond in acetylene is nearer to carbon which has 50%s-charater
    b) acetylene has only hydrogen on each carbon
    c) acetylene contains least number of hydrogens among the possible hydrocarbons having two carbons
    d) acetylene belong to the class of class of alkynes with molecular formula CnH2n-2

    2. In the free radical chlorination of methane the chain intiating step involves the formation of
    a) chlorine free radical
    b) hydrogen chloride
    c) methyl radical
    d) chloromethyl

  • 21. Alkyl Halides, Alcohols, Phenols and Ethers - Quiz


    SAMPLE QUESTIONS


    1. n-propyl alcohol and iso-propyl alcohol can be chemically distinguished by which reagent
    a) PCl5
    b) reduction 
    c) oxidation with potassium dichromate
    d) ozonolysis

    2. Which chloro derivative of benzene among the following would undergo hydrolysis most readily with aq NaOH to furnish the corresponding hydroxy derivative?
    a)
    b)
    c)
    d)

  • 22. Aldehydes and Ketones - Quiz


    SAMPLE QUESTIONS


    1. A strong base xan abstract an α-hydrogen from 
    a) alkene
    b) amine
    c) ketone
    d) alkane

    2. The reagent(s) which can be used to distinguish acetophenone from benzophenone is (are)
    a) 2,4-dinitrophenyl hydrazine
    b) aqueous solution of NaHSO3
    c) Benedict reagent
    d) I2 and Na2CO3

  • 23. Carboxylic Acids and their derivatives - Quiz


    SAMPLE QUESTIONS


    1. Among the following the strongest acid is
    a) CH3COOH
    b) CH2ClCH2COOH
    c) CH2ClCOOH
    d) CH3CH2COOH

    2. An ester is boiled with KOH. The product is cooled and acidified with conc HCl. A white crystalline acid seperates. The ester is
    a) methyl acetate
    b) ethyl acetate
    c) ethyl formate
    d) ethyl benzoate

  • 24. Nitrogen Compounds - Quiz


    SAMPLE QUESTIONS


    1. For carbylamine reaction, we need hot alcoholic KOH and
    a) any primary amine and chloroform
    b) chloroform and silver powder
    c) a primary amine and an alkyl halide
    d) a mono alkyl amine and trichloromethane

    2. When aniline reacts oil of bitter almonds (C6H5CHO) condensation takes place and benzal derivative is formed . This is known as
    a) Millons base
    b) Schiffs reagent
    c) Schiffs base
    d) Benedicts reagent

  • 25. Polymers - Quiz


    SAMPLE QUESTIONS


    1. In elastomer, the intermolecular forces are
    a) strong
    b) weak
    c) nil
    d) None of these

    2. which one of the following is not correctly matched?
    a)  
    b)
    c)
    d)

  • 26. Biomolecules and Chemistry in Everyday Life - Quiz


    SAMPLE QUESTIONS


    1. An example of bipolymer is
    a) teflon
    b) neoprene
    c) nylon-66
    d) DNA

    2. Enzymes are made up of
    a) edible proteins
    b) proteins with specific structure
    c) nitrogen containing carbohydrates
    d) carbohydrates