Total Number of Question/s - 3121

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  • 1. Some Basic Concepts of Chemistry - Quiz


    1. The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250mL of 2M HCl will be
    a) 0.875 M
    b) 1.00 M
    c) 1.75 M
    d) 0.0975 M

    2. The mass of potassium dichromate crystals required to oxidise 750 cm2 of 0.6 M Mohr's salt solution is (molar mass = 392)
    a) 0.49 g
    b) 0.45 g
    c) 22.05 g
    d) 2.2 g

  • 2. States of Matter - Quiz


    1. The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of cation is 110 pm, the radius of the anion is
    a) 288 pm
    b) 398 pm
    c) 618 pm
    d) 144 pm

    2. In van der Waals equation of state of the gas law, the constant b is a measure of
    a) intermolecular replusion
    b) intermolecular attraction
    c) volume occupied by the molecules
    d) intermolecular collisions per unit volume

  • 3. Atomic Structure - Quiz


    1. The electrons identified by quantum numbers n and l
    (1) n=4, l=1
    (2) n=4 , l=0,br> (3) n=3 , l = 2
    (4) n = 3, l = 1
    can be placed in the order of increasing energy as
    a) (3)<(4)<(2)<(1)
    b) (4)<(2)<(3)<(1)
    c) (2)<(4)<(1)<(3)
    d) (1)<(3)<(2)<(4)

    2. Uncertainty in position of a particle  of 25 g in space is 10-5. Hence, uncertainty in velocity (ms-1) is Plancks constant, h = 6.6 × 10-34 Js)
    a) 2.1 × 10-28
    b) 2.1 × 10-34
    c) 0.5 × 10-34
    d) 5.0 × 10-24

  • 4. Chemical Bonding - Quiz


    1. The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species?
    a) Bond length in NO+ is greater than in NO
    b) Bond length in NO is greater than in NO+
    c) Bond length in NO+ is equal to that in NO
    d) Bond length is unpredictable

    2. Which of the following molecules/ions does not contain unpaired electrons?
    a) $O_{2}^{2-}$
    b) B2
    c) $N_{2}^{+}$
    d) O2

  • 5. Thermodynamics - Quiz


    1. The standard enthalpy of formation $\left (\Delta H_{f}^{0} \right )$ at 298 K for methane, CH4(g) is -74.8 kJ mol-1. The addition information required to determine the average energy for C-H bond formation would be
    a) the dissociation energy of H2 and enthalpy of sublimation of carbon
    b) latent heat of vaporisation methane
    c) the first four ionisation energies of carbon and electron gain enthalpy of hydrogen
    d) the dissociation energy of hydrogen molecule, H2

    2. In view of the signs of ΔrG0 for the following reactions
    PbO2 + Pb → 2PbO , ΔrG0 < 0
    SnO2 + Sn → 2SnO , ΔrG0 > 0
    Which oxidation states are more characteristic for lead and tin?
    a) For lead + 4, for tin +2
    b) For lead +2, for tin +4
    c) For lead +4, for tin +4
    d) For lead +2, for tin +4

  • 6. Solutions - Quiz


    1. Which one of the following aqueous solutions will exhibit highest boiling point?
    a) 0.01 M Na2SO4
    b) 0.01 M KNO3
    c) 0.015 M urea
    d) 0.015 M glucose

    2. The molaltiy of a urea solution in which 0.0100 g of urea, [(NH2)2CO] is added to 0.3000 dm3 of water at STP is
    a) 0.555 m
    b) 5.55 x 10-4 m
    c) 33.3 m
    d) 3.33 x 10-2 m

  • 7. Equilibrium - Quiz


    1. At 250C, the solubility product of Mg(OH)2 is 1.0 x 10-11 . At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions?
    a) 9
    b) 10
    c) 11
    d) 8

    2. For the reaction equilibrium ,
    N2O4 (g) $\rightleftharpoons$ 2NO2 (g)
    the concentrations of N2O4 and NO2 at equilibrium are 4.8 x 10-2 and 1.2 x 10-2 mol L-1, respectively. the value of Kc for the reaction is
    a) 3.3 x 102 mol L-1
    b) 3 x 10-1 mol L-1
    c) 3 x 10-3 mol L-1
    d) 3 x 103 mol L-1

  • 8. Redox Reactions and Electrochemistry - Quiz


    1. Consider the following E0 values:
    $E_{Fe^{3+}/Fe^{2+}}$ = + 0.77 V
    $E_{Sn^{2+}/Sn}$ = -0.14 V
    Under standard conditions, the potential for the reaction
    Sn(s) + 2Fe3+(aq) → 2Fe2+(aq) + Sn2+(aq) is
    a) 1.68 V
    b) 1.40 V
    c) 0.91 V
    d) 0.63 V

    2. The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 250 C are given below
    $\Lambda{^{0}}_{CH_{3}COONa}$ = 91.0 S cm2 /equiv
    $\Lambda{^{0}}_{HCl}$ = 426.2 S cm2/equiv
    What additional information\quantity one needs to calculate &Lmabda;0 of an aqueous solution of acetic acid?
    a) Λ0 of NaCl
    b) Λ0 of CH3COOK
    c) The limiting equivalent conductance of H+0H+)
    d) Λ0 of chloroacetic acid (ClCH2COOH)

  • 9. Chemical Kinetics and Surface Chemistry - Quiz


    1. Rate constant , k of the first order reaction when initial concentration (C0) and concentration (Ct) at time t, is given by equation kt = log C0 - log Ct
    Graph is a straight line if we plot
    a) t vs log C0
    b) t vs log Cr
    c) t-1 vs log Cr
    d) log C0 vs log Cr

    2. The rate of a reaction double when its temperature changes from 300K to 310 K. Activation energy of such a reaction will be (R = 8.314 JK-1 mol-1 and log 2 = 0.301)
    a) 53.6 kJ mol-1
    b) 58.6 kJ mol-1
    c) 58.5 kJ mol-1
    d) 60.5kJ mol-1

  • 10. Periodicity of Elements - Quiz


    1. Which one of the following ions has the highest value of ionic radius?
    a) Li+
    b) B3+
    c) O2-
    d) F-

    2. The increasing order of the ionic radii of the given isoelectronic species is
    a) Cal-, Ca2+ , K+ , S2
    b) S2-, Cl-,Ca2+, K+
    c) Ca2+ , K+, Cl-, S2-
    d) K+,S2-, Ca2+,Cl-

  • 11. Principles and Processes of Metallurgy - Quiz


    1. Which method of purification is represented by the following equation?
    $Ti(s) + 2I_{2}(g) \overset{523 K}{\rightarrow} Til_{4}(g)\overset{1700K}{\rightarrow} Ti(g) + 2I_{2}(g)$
    a) Zone refining
    b) Cupellation
    c) Polling
    d) van-Arkel

    2. Which series of reactions correctly represent chemical relations related to iron and its compound?
    a) $Fe \overset{Dil.H_{2}SO_{4}}{\rightarrow} FeSO_{4} \overset{H_{2}SO_{4}.O_{2}}{\rightarrow} Fe_{2}\left (SO_{4} \right )_{3} \overset{Heat}{\rightarrow}Fe$
    b) $Fe\overset{O_{2},heat}{\rightarrow}FeO \overset{dil.H_{2}SO_{4}}{\rightarrow}FeSO_{4}\overset{Heat}{\rightarrow}Fe$
    c) $Fe\overset{Cl_{2}.heat}{\rightarrow}FeCl_{3} \overset{Heat,air }{\rightarrow}FeCl_{2}\overset{Zn}{\rightarrow}Fe$
    d) $Fe\overset{O_{2}.heat}{\rightarrow}Fe_{3}O_{4}\overset{CO,600^{0}C}{\rightarrow}FeO\overset{CO,700^{0}C}{\rightarrow}Fe$

  • 12. Hydrogen, s and p-Block Elements - Quiz


    1. What is the best description of the change that occurs when Na2O(s) is dissolved in water?
    a) Oxidation number of sodium decreases
    b) Oxide ion accepts a shared pair of electrons
    c) Oxide ion donates a pair of electrons
    d) Oxidation number of oxygen increases

    2. In which of the following arrangements, the sequence is not strictly according to the property written against it?
    a) Co2 < SiO2 < SnO2 < PbO2
    increasing oxidising power
    b) HF < HCl < HBr < HI
    increasing acid strength
    c) NH3 < PH3 < AsH3 < SbH3
    increasing basic strength
    d) B < C < O < N
    increasing first ionisation enthalpy

  • 13. d- and f-Block Elements and Coordination Chemistry - Quiz


    1. The magnetic moment (spin only) of [NiCl4]2- is
    a) 1.82 BM
    b) 5.46 BM
    c) 2.82 BM
    d) 1.41 BM

    2. The equation which is balanced and represents the correct product(s) is
    a) Li2O + 2KCl → 2LiCl + K2O
    b) [CoCl(NH3)5]+ + 5H+ → CO2+ + $5NH_{4}^{+}$ + Cl-
    c) $[Mg(H_{2}O)_{6}]^{2+} + (EDTA)^{4-} \overset{excess NaOH}{\rightarrow} [Mg (EDTA)]^{2+} + 6H_{2}O$
    d) CuSO4 + 4KCN → K2 [Cu(CN)4] + K2SO4

  • 14. Environmental Chemistry - Quiz


    1. The smog is essentially caused by the presence of
    a) O2 and O3
    b) O2 and N2
    c) oxides of sulphur and nitrogen
    d) O3 and N2

    2. Identify the wrong statements in the following
    a) Chlorofluorocarbons are responsible for ozone layer depletion
    b) Green house effect is responsible for global warming
    c) Ozone layer does not permit infrared radiation from the sun to reach the earth
    d) Acid rain is mostly because of oxides of nitrogen and sulphur

  • 15. General Organic Chemistry - Quiz


    1. Which type of isomerism is shown by 2,3-dichlorobutane?
    a) Structural
    b) Geometeric
    c) Optical
    d) Diastereo

    2. The correct order of increasing basicity of the given conjugate bases (R=CH3) is
    a) $RCO\bar{O} < HC = \bar{C} < \bar{R} < \bar{N}H_{2}$
    b) $\bar{R} < HC \equiv \bar{C} < RCO\bar{O} < \bar{N}H_{2}$
    c) $RCO\bar{O} < \bar{N}H_{2} < HC \equiv \bar{C} < \bar{R}$
    d) $RCO\bar{O} < HC \equiv \bar{C} < \bar{N}H_{2} < \bar{R}$

  • 16. Hydrocarbons and their Halogen Derivatives - Quiz


    1. On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is
    a) $CH_{3}COOC_{2}H_{5} + NaCl$
    b) $CH_{3}COONa + C_{2}H_{5}OH$
    c) $CH_{3}COCl + C_{2}H_{5}OH + NaOH$
    d) $CH_{3}Cl + C_{2}H_{5}COONa$

    2. The structure of the major product formed in the following reaction is

    c) ​

  • 17. Organic Compounds Containing Oxygen - Quiz


    1. Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?
    a) Phenol
    b) Benzaldehyde
    c) Butanol
    d) Benzoic acid

    2. Aspirin is known as
    a) acetyl salicyclic acid
    b) phneyl salicylate
    c) acetyl salicylate
    d) methane salicylic acid

  • 18. Organic Compounds Containing Nitrogen - Quiz


    1. On heating benzyl amine with chloroform and ethanolic KOH, product obtained by
    a) benzyl alcohol
    b) benzaldehyde
    c) benzonitrile
    d) benzyl isocyanide

    2. Fluorobenzene (C6H5F) can be synthesized in the laboratory
    a) by heating phenol eith HF and KF
    b) from aniline by diazotisation followed by heating the diazonium salt with HBF4
    c) by direct fluorination of benzene with F2 gas
    d) by reacting bromobenzene with NaF solution

  • 19. Polymers and Biomolecules - Quiz


    1. Identify the correct statement regarding enzymes.
    a) Enzymes are specific biological catalysts that can normally function at very high temperatures (T - 1000K)
    b) Enzymes are normally heterogeneous catalysts that are very specific in their action
    c) Enzymes are specific biological catalysts that cannot be poisoned
    d) Enzymes are specific biological catalysts that possess well defined active sites.

    2. Which base is present in RNA but not in DNA?
    a) Uracil
    b) Cytosine
    c) Guanine
    d) Thymine

  • 20. Analytical Chemistry and Chemistry in Everyday Life - Quiz


    1. How many EDTA (ethylenediamine tetraacetic acid ) molecules are required to make an octahedral complex with a Ca2+ ion?
    a) Six
    b) Three
    c) One
    d) Three

    2. Coordination compounds have great importance in biological systems. In this context , which of the following statements is incorrect?
    a) Chlorophyll is green pigment in plant and contain calcium
    b) Haemoglobin is the red pigment of blood and contains iron
    c) Cyanocobalamin is vitamin B12 and contains cobalt
    d) Carboxypeptidase-A is an enzyme and contains zinc