Total Number of Question/s - 6390

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  • 1. Some Basic Concepts of Chemistry - Quiz


    1. 13.5g of a sample of unstable hydrated sale Na2SO4.X H2O was not found to contain 6.3 g of H2O. The number of molecules of water of crystallisation is
    a) 5
    b) 7
    c) 2
    d) 10

    2. If 1021 molecules are removed from 200 mg of CO2, then the number of moles of CO2 left sre
    a) 2.88 x 10-3
    b) 1.66 x 10-3
    c) 4.54 x 10-3
    d) 1.66 x 10-2

  • 2. Structure of Atom - Quiz


    1. The total spin and magnetic moment for the atom with atomic number 24 are
    a) $\pm3,\sqrt{48}BM$
    b) $\pm3,\sqrt{35}BM$
    c) $\pm \frac{3}{2}\sqrt{48}BM$
    d) $\pm \frac{3}{2}\sqrt{35}BM$

    2. In which one, of the following pairs, the two species are both isoelectronic and isotopic? (Atomic numbers: Ca = 20, Ar = 18 , K = 19, Mg = 12, Fe = 26, Na = 11)
    a) 40Ca2+ and 40Ar
    b) 39K+ and 40K+
    c) 24Mg2+ and 25Mg2+
    d) 23Na and 24Na+

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


    1. The five successive ionisation energy of an element are 800, 2427, 3658, 25024 and 32824 kJ mol-1 respectively. The number of valence electron is
    a) 3
    b) 5
    c) 1
    d) 2

    2. The first ionization energy for Li is 5.4 eV and electron affinity of Cl is 3.61 eV. The Δ H (in kJ/mol) for the reaction,
    Li(g) + Cl (g) →Li+ (g) + Cl- (g)
    If the resulting ions do not combine with each other is (1 eV = 1.6 x 10-19 J)
    a) 70
    b) 100
    c) 170
    d) 270

  • 4. Chemical Bonding and Molecular Structure - Quiz


    1. The number and type of bonds between two C-atoms in SrC2 is
    a) 1σ, 1π
    b) 1σ, 2π
    c) 1σ, 1.5π
    d) 1σ

    2. The electronic configuration of the outermost shell of the most electronegative element is
    a) 2s2 2p5
    b) 3s2 3p5
    c) 4s2 4p5
    d) 5s2 5s5

  • 5. States of Matter - Quiz


    1. Most, crystals show good cleavage because their atoms, ions or molecules are
    a) weakely bonded together
    b) strongly bonded together
    c) spherically symmeterical
    d) arranged in planes

    2. If 300 ml of a gas weigh 0.368 g at STP, what is its molecular weight?
    a) 30.16
    b) 2.55
    c) 27.5
    d) 37.5

  • 6. Thermodynamics - Quiz


    1. Which one of the following equations does not correctly represents the first law of thermodynamics for the given process?
    a) Isothermal process : q = - w
    b) Cyclic process = - w
    c) Isochoric process : ΔE = q
    d) Expansion of a gas into vaccum : ΔE = q

    2. CP - CV = R. This R is
    a) Change in KE
    b) Change in rotational energy
    c) Work done which system can do on expanding the gas per mole per degree increase in temperature
    d) All correct

  • 7. Equilibrium - Quiz


    1. The pH of a solution obtained by mixing 50 mL of 0.2 M HCI with mL of 0.20 M CH3COOH is
    a) 0.3
    b) 0.7
    c) 1
    d) 2

    2. The aqueous solution of which of the salts has pH close to7>
    a) FeCI3
    b) CH3COONa
    c) CH3COONH4
    d) KCN

  • 8. Redox Reactions - Quiz


    1. Which of the following acids possesses oxidising, reducing and complex forming properties?
    a) HNO3
    b) H2SO4
    c) HCL
    d) HNO3

    2. The oxidation number of P in Mg2P2O7 is
    a) 3
    b) 2
    c) 5
    d) -3

  • 9. Hydrogen - Quiz


    1. Hardness of water is due to the presence of ________, ____________and _______of calcium and magnesium.
    a) Chlorides, sulphates , bicarbonates
    b) Bicarbonates, chlorides, sulphates
    c) Sulphates, chlorides, bicarbonates
    d) None of these

    2. Nascent hydrogen consists of
    a) Hydrogen atoms with excess energy
    b) Hydrogen molecules with excess energy
    c) Hydrogen ions in the excited state
    d) Solvated protons

  • 10. The s-Block Elements - Quiz


    1. Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is
    a) BeCI2
    b) MgCI2
    c) CaCI2
    d) SrCI2

    2. Mg and Li are similar in their properties due to
    a) Same e/m ratio
    b) Same electron affinity
    c) Same group
    d) Same ionic potential

  • 11. The p-Block Elements - Quiz


    1. What is not true about borax?
    a) Molecular formula is Na2B4O7. 10H2O.
    b) Crystallic borax contains tetranuclear unit of [B4O5(OH)4]2-
    c) It hydrolyses to give an acidic solution
    d) White crystalline solid

    2. Al2O3 can be converted to anyhydrous AlCl3 by heating:
    a) A mixture of Al2O3 and carbon in dry Cl2 gas
    b) Al2O3 with HCl gas
    c) Al2O3 with Cl2 gas
    d) Al2O3 with NaCl in solid state

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


    1. Methyl carbanion is________and___________with ammonia.
    a) Isoelectronic, isostructural
    b) Isotonic, isoelectronic
    c) Isostructural, isotonic
    d) None of these

    2. How many cyclic and acyclic isomers (including tautomers) can be made by the formula C3H6O?
    a) 4
    b) 5
    c) 9
    d) 10

  • 13. Hydrocarbons - Quiz


    1. Which of the following alkalne has lowest boiling point and highest melting point?
    a) n-Pentane
    b) Isopentane
    c) Neopentane
    d) n-Hexane

    2. The order of decreasing reactivity towards an electrophilic reagent for the following:
    (i) Benzene
    (ii) Toluene
    (iii) Chlorobenzoic acid
    (iv) Phenol
    would be
    a) (iv) > (ii) > (i) > (iii)
    b) (i) > (ii) > (iii) > (iv)
    c) (ii) > (iv) > (i) > (iii)
    d) (iv) > (iii) > (ii) > (i)

  • 14. Environmental Chemistry - Quiz


    1. In the term BOD5, 5 is used because it represents minimum level of 5 ppm.
    a) True
    b) False

    2. The most abundant hydrocarbons pollutant is
    a) Methane
    b) Ethane
    c) Propane
    d) Butane

  • 15. Chemical Equlibrium - Quiz


    1. For a reaction A(g) $\rightleftharpoons$ B(g) + C(g) Kp at 4000C is 1.5 x 10-4 and Kp at 6000C is 6 x 10-3. Which statement is incorrect?
    a) The reaction is exothermic
    b) Increase in temperature increases the formation of B
    c) Increase in pressure increases the formation of A
    d) Decrease in temperature and increase in pressure shift the equilibnrium towards left.

    2. The decomposition of N2O4 to NO2 is carried out at 2800C in chloroform. When equilibrium is reached, 0.2 mol of N2O4 and 2 x 10-3 mol of NO2 are present in a 2L solution. The equilibrium constant for the reaction
    N2O4 $\rightleftharpoons$ 2NO2 is
    a) 1 x 10-2
    b) 2 x 10-3
    c) 1 x 10-5
    d) 2 x 10-5

  • 16. Ionic Equlibrium - Quiz


    1. What are the units in which the solubility product of Ca3(PO4)2 is expressed?
    a) mol dm-3
    b) mol2 dm-6
    c) mol3 dm-9
    d) mol5 dm-15

    2. Which of the following mixture solution has pH $\approx$ 1.0?
    a) 100 mL M/10 HCl + 100 mL M/10 NaOH
    b) 55mL M/10 HCl + 45 mL M/10 NaOH
    c) 10mL M/10 HCl + 90 mL M/10 NaOH
    d) 75mL M/5 HCl + 25 mL M/5 NaOH

  • 17. Alkanes and Cycloalkanes - Quiz


    1. when aqueous solution of sodium ethanoate is electrolysed , the volume of gases obtained at cathode at a pressure of 1.0 bar and 289K temperature when 2.0 Faraday of electricity is passed is
    a) 67.2 litres
    b) 68.1 litres
    c) 73.2 litres
    d) 74.1 litres

    2. Which of the statements is/are true about the reactivity of halogenation of alkanes? The reactivity order is F2 > Cl2 > Br2 > I2.
    Lower the activation energy for the chain initiation step, more reactive is the halogen.
    II. Lower the activation energy for the first chain propagation step, more reactive is the halogen.
    III. More negative is the overall herat of the reaction (ΔHr0) of halogenation of alkane, more reactive is the halogen.
    IV. Lower the activation energy for the second chain-propagation step, more reactive is the halogen
    a) (I),(II),(III)
    b) (I),(III)
    c) (II),(III),(IV)

  • 18. Alkenes and Alkadienes - Quiz


    Compound (A) is :

    2. Which statement is correct about cyclopentadienyl anion?

    a) Both (I) and (II) are aromatic but (II) is more stable than (I)
    b) Both (I) and (II) are aromatic and have the same stability.
    c) (II) is more aromatic and more stable than (I) and it is non-aromatic
    d) (I) is more stable than (I) though both are aromatic.

  • 19. Alkynes - Quiz


    compound (B) :

    The major amount of (C) is :

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


    1. Ca2+ is isoelectronic with
    a) Mg2+
    b) Kr
    c) Ar
    d) Na

    2. Which of the following metal reacts with cold H2O with the evolution of H2 gas?
    a) Ca
    b) Al
    c) Zn
    d) Cu

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


    1. Carbon forms a large number of compounds due to :
    a) Tetravalency
    b) Variable valency
    c) Large chemical affinity
    d) Property of catenation

    2. Double chain structures are present in asbestors. Which of the anions are present in them?
    a) (Si2O52-)n
    b) (Si4O116-)n
    c) (SiO32-)n
    d) (SiO44-)

  • 22. Classification & Nomenclature of Organic Compounds - Quiz


    1. A compound (A) with molecular formula C5 H10 gives one monochlorination product. Compound (A) is:

    2. Which of the following is not the name of CH3 NC?
    a) Methyl isocyanide
    b) Aceto isonitrile
    c) Methyl carbylamine
    d) Acetonitrile

  • 23. Quantitative & Qualitative Analysis - Quiz


    1. An organic compound contains C = 40%, O = 53.5%, and H = 6.5%. The empirical formula of the compound is:
    a) CH2 O
    b) C2 H4 O
    c) C6 H12 O6
    d) C2 H4 O2

    2. 7.5 ml of a gaseous hydrocarbon was exploded with 36 ml of O2. On cooling the volume of gases was found to be 28.5 ml, 15 ml of which was absorbed by KOH and the rest was absorbed in a solution of alkaline pyrogallol. The formula of hydrocarbon is:
    a) C2 H6
    b) C2 H4
    c) C3 H8
    d) C3 H6

  • 24. Isomerism - Quiz


    1. Which of the following statements regarding the concept of resonance is not correct?
    a) The different resonating structures of a molecule have fixed arrangement of atomic nuclei
    b) The different resonating structures differ in the arrangement of electrons
    c) None of the individual resonating structures explains the various characteristics of the molecule
    d) The hydrid structures have equal contribution from all the resonating structures.

    2. A compound whose molecule is superimposible on its mirror image despite containing chiral carbon atoms is
    a) Threo isomer
    b) Meso compound
    c) Enantiomer
    d) No special name

  • 25. General Organic Chemistry - Quiz


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

    2. The decreasing nucleophilicity of the following is :
    I. $CH_{3}S^{\circleddash }$ II. $CH_{3}O^{\circleddash }$ III. IV. $EtO^{\circleddash }$
    a) IV > III > II > I
    b) I > II > III > IV
    c) IV > III > I > II
    d) II > I > III > IV

  • 26. Organic Reaction & Mechanism - Quiz


    1. Arrangement the following in the decreasing irder of nucleophilic acyl substitution reaction.

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

    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