Total Number of Question/s - 3530

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  • 1. Some Basic Concepts of Chemistry - Quiz


    SAMPLE QUESTIONS


    1. The number of gram molecules of oxygen in 6.02 × 1024 CO molecules is
    a) 10g molecules
    b) 5 g molecules
    c) 1 g molecules
    d) 0.5 g molecules

    2. The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is
    a) one fifth
    b) five
    c) one
    d) two

  • 2. Atomic Structure - Quiz


    SAMPLE QUESTIONS


    1. If ionisation potential for hydrogen atom is 13.6 eV, then potential for He+ will be
    a) 54.4 eV
    b) 6.8 eV
    c) 13.6 eV
    d) 24.5 eV

    2. Electronic configuration of calcium atom can be written as
    a) [Ne] 4p2
    b) [Ar] 4s2
    c) [Ne] 4s2
    d) [Kr]4p2

  • 3. Chemical Bonding - Quiz


    SAMPLE QUESTIONS


    1. Which structure is linear?
    a) SO2
    b) CO2
    c) $CO_{3}^{2-}$
    d) $SO_{4}^{2-}$

    2. According to MO theory which of the following lists rank the nitrogen species in terms of increasing bond order?
    a) $N_{2}^{-} < N{2} < N_{2}^{2-}$
    b) $N_{2}^{2-} < N_{2}^{-}< N{2} $
    c) $N_{2} < N_{2}^{2-}< N_{2}^{-}$
    d) $N_{2}^{-} < N_{2}^{2-}< N_{2} $

  • 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 vapour pressure of benzene at a certain temperature is 640mmHg. A non-volatile and non-electrolyte solid, weighing 2.175 g is added to 39.08g of benzene. If the vapour pressure of the solution is 600mmHg, what is the molecular weight of solid substance?
    a) 49.50
    b) 59.60
    c) 69.40
    d) 79.82

  • 5. States of Matter - Quiz


    SAMPLE QUESTIONS


    1. A ideal gas cannot be liquified because
    a) its critical temperature is always above 00C
    b) its molecules are relatively smaller in size
    c) it solidifies before becoming a liquid
    d) forces operating between its molecules are negligible

    2. For orthorhombic system axial ratios are a≠b≠c and the axial angles are
    a) α = β = γ ≠ 900
    b) α = β = γ = 900
    c) α = γ = 900, β ≠ 900
    d) α ≠ β ≠ &gamma ≠ 900

  • 6. Nuclear Chemistry - Quiz


    SAMPLE QUESTIONS


    1. Carbon-14 dating method is based on the fact that
    a) carbon-14 fraction is same in all objects
    b) carbon-14 is highly insoluble
    c) ratio of carbon-14 and carbon-12 is constant
    d) all of the above

    2. 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

  • 7. Chemical Equilibrium - Quiz


    SAMPLE QUESTIONS


    1. According to Le-Chatliers principle, adding heat to a solid   liquid equilibrium will cause the 
    a) temperature to increase
    b) temperature to decrease
    c) amount of liquid to decrease
    d) amount of solid to decrease

    2. In the two gaseous reactions (i) and (ii) at 2500C
    (i) NO(g) + $\frac{1}{2}$O2(g) NO2(g),         K1
    (ii) 2NO2(g) 2NO(g) +O2(g) ,           K2
    the equilibrium constants K1 and K2 are related as
    a) K2 = $\frac{1}{K_{1}}$
    b) K2 = $K_{1}^{1/2}$
    c)
    K2 = $\frac{1}{K_{1}^{2}}$

    d) K2 = $K_{1}^{2}$

  • 8. Ionic Equilibrium - Quiz


    SAMPLE QUESTIONS


    1. The rapid change of pH near the stoichiometric point of an acid base titration is the basis of indicator detection. pH of the solution is related to ratio of the concentration of the conjugate acid (Hln) and base (In-) forms of the indicator given by the expression
    a) $log\frac{[In^{-}]}{[HIn]}$ = pKIn - pH
    b) $log\frac{[HIn]}{[In^{-}]}$ = pKIn - pH
    c) $log\frac{[HIn]}{[In^{-}]}$ = pH - pKIn
    d) $log\frac{[In^{-}]}{[HIn]}$ = pH - pKIn

    2. At 250C, the dissociation constant of a base, BOH is 1.0 × 10-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be
    a) 2.0 × 10-6 mol L-1
    b) 1.0 × 10-5 mol L-1
    c) 1.0 × 10-6 mol L-1
    d) 1.0 ×10-7 mol L-1

  • 9. Thermodynamics - Quiz


    SAMPLE QUESTIONS


    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. Unit of entropy is
    a) JK-1 mol-1
    b) J mol-1
    c) J-1 K-1 mol-1
    d) JK mol-1

  • 10. Chemical Kinetics - Quiz


    SAMPLE QUESTIONS


    1. Activation energy of chemical reaction can be determined by
    a) evaluating rate constant at standard temperature
    b) evaluating velocities of reaction at two different temperatures
    c) evaluating rate constant at two different temperatures
    d) changing concentration of reactants

    2. Half-life period of a first order reaction is 1386s. The specific rate constant of the reaction is
    a) 5.0 × 10-3 s-1
    b) 0.5 × 10-2 s-1
    c) 0.5 × 10-3 s-1
    d) 5.0 × 10-3 s-1

  • 11. Electrochemistry - Quiz


    SAMPLE QUESTIONS


    1. In electrolysis of NaCl when Pt electrode is taken than H2 is liberated at cathode while eith Hg cathode it forms sodium amalgam because
    a) Hg is more inert than Pt
    b) more voltage is required to reduce H- at Hg than at Pt
    c) Na is dissolved in Hg while it does not dissolved in Pt
    d) concentration of H+ ions is larger when Pt electrode is taken

    2. The emf of a Daniel cell at 298 K is E1

    when the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the emf changed to E2. What is the relationship between E1 and E2 ?
    a) E1 > E2
    b) E1 < E2
    c) E1 = E2
    d) E2 = 0 ≠ E1

  • 12. Surface Chemistry - Quiz


    SAMPLE QUESTIONS


    1. 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

    2. According to the adsorption theory of catalysis the speed of the reaction increases because
    a) adsorption produces heat which increases the speed of the reaction
    b) adsorption lowers the activation energy of the reaction
    c) the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
    d) in the process of adsorption, the activation energy of the molecules becomes large

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


    SAMPLE QUESTIONS


    1. Elemental silicon to be used as a semiconductor is purified by
    a) heating under vacuum
    b) floatation
    c) zone refining
    d) electrolysis

    2. Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
    a) carbon and hydrogen are suitable reducing agents for metal sulphides
    b) The ΔfG0 of the sulphide is greater than those for CS2 and H2S
    c) The ΔfG0 is negative for roasting of sulphide ore to oxide
    d) Roasting of the sulphide to the oxide is thermodynamically feasible

  • 14. Chemical Periodicity - Quiz


    SAMPLE QUESTIONS


    1. One of the characteristic properties of non-metals is that they
    a) are reducing agents
    b) form basic oxides
    c) form cations by electron gain
    d) are electronegative

    2. Which of the following order is wrong?
    a) NH3 < pH3 < AsH3 - acidic
    b) Li < Be < B < C - ist IP
    c) Al2O3 < MgO < Na2O < K2O - basic
    d) Li+ < Na+ < K+ < Cs+ - ionic radius

  • 15. Comparative Study of Elements - Quiz


    SAMPLE QUESTIONS


    1. The acid which has a peroxy linkage is
    a) sulphorous acid
    b) pyrosulphuric acid
    c) dithionic acid
    d) Caros acid

    2. Which of the following is most acidic?
    a) N2O5
    b) P2O5
    c) As2O5
    d) Sb2O5

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


    SAMPLE QUESTIONS


    1. Identify the incorrect statement among the following
    a) There is a decrease in the radii of the atoms or ions as one proceeds from La or Lu.
    b) Lanthanide contraction is the accumulation of successive shrinkages
    c) As a result of lanthanide contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements
    d) Shielding power of 4f electrons is quite weak

    2. Copper sulphate dissolves in excess of KCN to give
    a) CuCN
    b) [Cu(CN)4]3-
    c) [Cu(CN)4]2-
    d) Cu(CN)2

  • 17. Coordination Compounds - Quiz


    SAMPLE QUESTIONS


    1. Which of the following is considered to be an anticancer species?
    a)
    b)
    c)
    d)

    2. The coordination number and oxidation state of Cr in K3[Cr(2O4)3] are respectively
    a) 3 and +3
    b) 3 and 0
    c) 6 and +3
    d) 4 and +2

  • 18. Chemical Analysis - Quiz


    SAMPLE QUESTIONS


    1. The best method for the separation of napthalene and benzoic acid from their mixture is
    a) chromatography
    b) crystallisation
    c) distillation
    d) sublimation

    2. 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

  • 19. General Organic Chemistry - Quiz


    SAMPLE QUESTIONS


    1. Name of the compound given below

    a) 2,3-diethylheptane
    b) 5-ethyl-6-methyloctane
    c) 4-ethyl-3-methyloctane
    d) 3-methyl-4-ethyloctane

    2. But-2-exhibits cis-trans isomerism due to
    a) rotation around C2-C3 double bond
    b) rotation around C3-C4 sigma bond
    c) rotation around C1-C2 bond
    d) restricted rotation around C=C bond

  • 20. Hydrocarbons - Quiz


    SAMPLE QUESTIONS


    1. Among the following alkenes
    1-butene    cis-2-butene    trans-2-butene
           I                      II                 III
    The decreasing order of stablility is
    a) II > I > III
    b) III > II > I
    c) III > I > II
    d) I > II > III

    2. 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

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


    SAMPLE QUESTIONS


    1. The major organic product in the reaction ,
    CH3OCH(CH3)2 + HI → Product , is/are
    a) CH3OH+(CH3)2CHI
    b) ICH2OCH(CH3)2
    c)

    d) CH3I+(CH3)2CHOH

    2. Increasing order of acidic streangth among p-methoxy phenol (I), p-methyl phenol (II) and p-nitrophenol (III) is
    a) III,I,II
    b) II,I,III
    c) III,II,I
    d) I,II,III

  • 22. Aldehydes and Ketones - Quiz


    SAMPLE QUESTIONS


    1. 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

    2. Acetone reacts with iodide (I2) to form iodoform in the presence of
    a) CaCO3
    b) NaOH
    c) KOH
    d) MgCO3

  • 23. Carboxylic Acids and their derivatives - Quiz


    SAMPLE QUESTIONS


    1. Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields
    a) ethyl butyrate
    b) acetoacetic ester
    c) methyl acetoacetate
    d) ethyl propionate

    2. Propionic acid with Br2-P yields a dibromo product. Its structure would be
    a) CH2Br-CHBr-COOH
    b)
    c) CH2Br-CH3-COBr
    d)

  • 24. Nitrogen Compounds - Quiz


    SAMPLE QUESTIONS


    1. Consider the following sequence of reactions

    The compound [A] is
    a) CH3CH2CN
    b) CH3NO2
    c) CH3NC
    d) CH3CN

    2. Predict the product,

    a)
    b)
    c)
    d)

  • 25. Polymers - Quiz


    SAMPLE QUESTIONS


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

    2. Acrilon is a hard, horny and a high melting material. Which of the following represents its structure?
    a)
    b)
    c)
    d)

  • 26. Biomolecules and Chemistry in Everyday Life - Quiz


    SAMPLE QUESTIONS


    1. The number of molecules of ATP produced in the lipid metabolism of a molecule of palmonic acid is
    a) 130
    b) 36
    c) 56
    d) 86

    2. Which of the following is correct about H-bonding in nucleotide?
    a) A-T, G-C
    b) A-G,T-C
    c) G-T,A-C
    d) A-A,T-T