Total Number of Question/s - 3121

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  • 1. Some Basic Concepts of Chemistry - Quiz


    SAMPLE QUESTIONS


    1. 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. How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?
    a) 0.02
    b) 3.215 × 10-2
    c) 1.25 × 10-2
    d) 2.5 × 10-2

  • 2. States of Matter - Quiz


    SAMPLE QUESTIONS


    1. According to the kinetic theory og gases , in an ideal gas, between two sucessive collisions gas molecule travels
    a) in a circular path
    b) in a wavy path
    c) in a straight line path
    d) with an accelerated velocity

    2. Based on kinetic theory of gases following laws can be proved
    a) Boyles law
    b) Charles law
    c) Avogadro law
    d) All of these

  • 3. Atomic Structure - Quiz


    SAMPLE QUESTIONS


    1. Of the following sets, which one does not contain isoelectronic species?
    a) $BO_{3}^{3-}, CO_{3}^{2-}, NO_{3}^{-}$
    b) $SO_{3}^{3-}, CO_{3}^{2-}, NO_{3}^{-}$
    c) $CN^{-},N_{2},C_{2}^{2-}$
    d) $CN^{-},N_{2},C_{2}^{2-}$

    2. The orbit angular momentum for an electron revolving in an orbit is given by $\sqrt{l\left (l + 1 \right )}\frac{h}{2\pi}$ . This momentum for s-electrons will be given by
    a) $+\frac{1}{2} . \frac{h}{2\pi}$
    b) zero
    c) $\frac{h}{2\pi}$
    d) $+\frac{1}{2} . \frac{h}{2\pi}$

  • 4. Chemical Bonding - Quiz


    SAMPLE QUESTIONS


    1. Which of the following has maximum number of lone pairs associated with Xe?
    a) XeO3
    b) XeF4
    c) XeF6
    d) XeF2

    2. The molecule having smallest bond angle is
    a) NCl3
    b) AsCl3
    c) SbCl3
    d) PCl3

  • 5. Thermodynamics - Quiz


    SAMPLE QUESTIONS


    1. For the complete combustion of ethanol,
    C2H5OH(l) + 3O2(g) → 2CO2 (g) + 3H2O (l)
    the amount of heat produced as measured in bomb calorimeter is 1364.47 kJ mol-1 at 250C. Assuming ideality, the ehthalpy of combustion, ΔCH for the reaction will be
    a) -1366.95 kJ mol-1
    b) -1361.95 kJ mol-1
    c) -1460.50 kJ mol-1
    d) -1350.50 kJ mol-1

    2. In conversion of limestone to lime,
    CaCO3 (s) → CaO(s) + CO2 (g)
    the value of ΔH0 and ΔS0 are +179.1 kJ mol-1 and 160.2 J/K, respectively at 298 K and 1 bar . Assuming that ΔH0 and ΔS0 do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is
    a) 1008 K
    b) 1200 K
    c) 845 K
    d) 1118 K

  • 6. Solutions - Quiz


    SAMPLE QUESTIONS


    1. Two solutions of a substance (non-electrolyte) are mixed in the following manner.
    480 mL of 1.5 M first first solution + 520 mL of 1.2 M second solution .
    what is the molarity of the final mixture?
    a) 2.70 M
    b) 1.34 M
    c) 1.50 M
    d) 1.20 M

    2. A pressure cooker reduces cooking time for food because
    a) heat is more evenly distributed in the cooking space
    b) boiling of water involved in cooking is increased
    c) the higher pressure inside the cooker crushes the food materials
    d) ccoking involves chemical changes helped by a rise in temperature

  • 7. Equilibrium - Quiz


    SAMPLE QUESTIONS


    1. Four species are listed below
    I. $HCO_{3}^{-}$ II. H3O+
    III. $HSO_{4}^{-}$ IV. HSO3F
    Which one of the following is the correct sequence of their acid strength?
    a) IV < II < III < I
    b) II < III < I < IV
    c) I < III < II < IV
    d) III < I < IV < II

    2. A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of Kp is
    a) 1.9 atm
    b) 3 atm
    c) 0.3 atm
    d) 0.18 atm

  • 8. Redox Reactions and Electrochemistry - Quiz


    SAMPLE QUESTIONS


    1. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is
    a) 3
    b) 2
    c) 6
    d) 4

    2. Among the properties (A) reducing (B) oxidising and (C) complexing , the set of properties shown by CN- ion towards metal species is
    a) A,B
    b) B,C
    c) C,A
    d) A,B,C

  • 9. Chemical Kinetics and Surface Chemistry - Quiz


    SAMPLE QUESTIONS


    1. 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

    2. Which one of the following characteristics is not correct for physical adsorption?
    a) Adsorption on solids is reversible
    b) Adsorption increases with increase in temperature
    c) Adsorption is spontaneous
    d) Both enthalpy and entropy of adsorption are negative

  • 10. Periodicity of Elements - Quiz


    SAMPLE QUESTIONS


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

    2. Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is
    a) SO2 < P2O3 < SiO2 < Al2O3
    b) SiO2 < SO2 < Al2O3 < P2O3
    c) Al2O3 < SiO2 < SO2 < P2O3
    d) Al2O3 < SiO2 < P2O3 < SO2

  • 11. Principles and Processes of Metallurgy - Quiz


    SAMPLE QUESTIONS


    1. Refining of impure copper with zinc impurity is to be done electrolysis using electrodes as
    a) cathode - pure copper, Anode - pure zinc
    b) cathode - pure zinc, Anode - copper
    c) cathode - pure copper, Anode - impure copper
    d) cathode - pure zinc, Anode - impure zinc

    2. Cyanide process is used for the extraction of
    a) barium
    b) silver
    c) boron
    d) zinc

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


    SAMPLE QUESTIONS


    1. Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is
    a) R4Si
    b) R SiCl3
    c) R2SiCl2
    d) R3SiCl

    2. Glass is a
    a) microcrystalline solid
    b) super cooled liquid
    c) gel
    d) polymeric mixture

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


    SAMPLE QUESTIONS


    1. The coordination number and the oxidatioin state of the element E in the complex [E(en)2 (C2O4)] NO2 (where (en) is ethylene diamine) are, respectively
    a) 6 and 2
    b) 4 and 2
    c) 4 and 3
    d) 6 and 3

    2. Which one of the following nitrates will leave behind a metal on strong heating?
    a) Ferric nitrate
    b) Copper nitrate
    c) Manganese nitrate
    d) Silver nitrate

  • 14. Environmental Chemistry - Quiz


    SAMPLE QUESTIONS


    1. What is DDT among the following?
    a) Green house gas
    b) A fertilizer
    c) Biodegradable pollutant
    d) Non-biodegradable pollutant

    2. The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was
    a) Methylisocyanate
    b) Methylamine
    c) Ammonia
    d) Phosgene

  • 15. General Organic Chemistry - Quiz


    SAMPLE QUESTIONS


    1. In the following benzyl/allyl system
    R-CH=CH2 or
    (R is alkyl group)
    decreasing order of inductive effect is
    a) (CH3)3C- > (CH3)2CH - > CH3CH2-
    b) CH3CH2- > (CH3)2CH - > (CH3)3C-
    c) (CH3)2CH- > CH3CH2- > (CH3)3C-
    d) (CH3)2C- > CH3CH2 - > (CH3)3OH-

    2. The order of stability of the following carbocations

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

  • 16. Hydrocarbons and their Halogen Derivatives - Quiz


    SAMPLE QUESTIONS


    1. The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is
    a) gammexane
    b) DDT
    c) freon
    d) hexachloroethane

    2. Trans-2-phenyl-1-bromocyclopentane on reaction with alcohol KOH produces
    a) 4-phenylcyclopentene
    b) 2-phenylcyclopentene
    c) 1-phenylcyclopentene
    d) 3-phenylcyclopentene

  • 17. Organic Compounds Containing Oxygen - Quiz


    SAMPLE QUESTIONS


    1. From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous ZnCl2 is
    a) 2-butanol
    b) 2-methylpropan-2-1
    c) 2-methylpropanol
    d) 1-butanol

    2. 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

  • 18. Organic Compounds Containing Nitrogen - Quiz


    SAMPLE QUESTIONS


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

    2. In the chemical reaction,
    CH3CH2NH2 + CHCl3 + 3KOH → (A) + (B) + 3H2O,
    the compounds (A) and (B) are respectively
    a) C2H5CN and 3KCL
    b) C3CH2CONH2 and 3KCl
    c) C2 H5 NC and 3KCl
    d) C2 H5 NC and 5KCl

  • 19. Polymers and Biomolecules - Quiz


    SAMPLE QUESTIONS


    1. Bakellite is obtained from phenol by reacting with
    a) (CH2OH)2
    b) CH3CHO
    c) CH3COCH3
    d) HCHO

    2. The pyrimidine bases present in DNA are
    a) cytosine and adenine
    b) cytosine and guanine
    c) cytosine and thymine
    d) cytosine and uracil

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


    SAMPLE QUESTIONS


    1. 2.9 mg of an organic compound containing nitrogen was digested according to Kjeldahls method and the evolved ammonia was absorbed in 20 mL of 0.1MHCl solution. The excess of the acid required 15Ml of 0.1 M NaOH solution for complete neutralization . The percentage of nitrogen in the compound is
    a) 59
    b) 47.4
    c) 23.7
    d) 29.5

    2. Which of the following could act as a propellant for rockets?
    a) Liquid hydrogen + liquid nitrogen
    b) Liquid oxygen + liquid argon
    c) Liquid hydrogen + liquid oxygen
    d) Liquid nitrogen + liquid oxygen