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    Mole Concept DPP 1

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    iitmohak

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    Mole Concept DPP 1

    Uploaded by

    iitmohak
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    7 views3 pages

    Mole Concept DPP 1

    Uploaded by

    iitmohak

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    © All Rights Reserved
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    of 3

    CLASS : XIth SUBJECT : CHEMISTRY

    DATE : DPP No. : 1

    Topic :- SOME BASIC CONCEPTS OF CHEMISTRY


    1. Cyclohexanol is dehydrated to cyclohexene on heating with conc 𝐻2𝑆𝑂4. The cyclohexene
    obtained from 100 g cyclohexanol will be
    (If yield of reaction is 75%)
    a) 61.5 g b) 75.0 g c) 20.0 g d)41.0 g

    2. A compound was found to contain nitrogen and oxygen in the ratio, nitrogen 28 g and 80 g of
    oxygen. The formula of the compound is:
    a) NO b) N2O3 c) N2O5 d) N2O4

    3. Versene, a chelating agent having chemical formula C2H4N2(C2H2O2Na)4. If each mole of this
    compound could bind 1 mole of Ca2 +, then the rating of pure versene expressed as mg of CaC
    O3 bound per g of chelating agent is:
    a) 100 mg b) 163 mg c) 200 mg d)263 mg

    4. Which of the following is correct?


    wt.
    a) Meq. = 𝑁 × 𝑉in mL = Eq. wt. × 1000
    wt.
    b) Eq. = 𝑁 × 𝑉in mL = Eq. wt.
    c) Equal equivalent or milli equivalent of reactants react to give same eq. or Meq. of products
    d)All of the above

    5. 1.0 g of pure calcium carbonate was found to require 50 mL of dilute HCl for complete
    reactions. The strength of the HCl solution is given by:
    a) 4 𝑁 b) 2 𝑁 c) 0.4 𝑁 d)0.2 𝑁

    6. The number of atoms in 4.25 g of NH3 is approximately


    a) 6 × 1023 b) 2 × 1023 c) 1.5 × 1023 d)1 × 1023

    7. MnO― 4 ions are reduced in acidic condition to Mn


    2+
    ions whereas they are reduced in neutral
    condition to MnO2. The oxidation of 25 mL of a solution 𝑋 containing Fe2+ ions required in
    acidic condition 20 mL of a solution 𝑌 containing MnO― 4 ions. What volume of solution 𝑌 would
    +
    be required to oxidise 25 mL of a solution 𝑋 containing Fe2 ions in neutral condition?
    a) 11.4 mL b) 12.0mL c) 33.3 mL d)35.0 mL
    8. Number of atoms of He in 100 u of He (atomic weight of He is 4) are
    a) 25 b) 100 c) 50 d)100 × 6 × 10―23

    9. Total number of atoms present in 1.0 cm3 of solid glucose (density 0.8 g/ cm3) at 25 ͦC are:
    a) 2.68 × 1021 b) 6.42 × 1022 c) 2.68 × 1022 d)2.68 × 1023

    10. For preparing 𝑀/ 10 solution of H2SO4 in one litre we need H2SO4:


    a) 9.8 g b) 49.0 g c) 4.8 g d)0.09 g

    11. Given, that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%,90% and 5%, respectively, the
    atomic mass of Fe is
    a) 55.85 b) 55.95 c) 55.75 d)56.05

    12. The concentration of solution containing 0.5 mole H3PO4 dissolved in 500 g water:
    a) 1 𝑚 b) 1 𝑀 c) 1 𝑁 d)0.5 𝑀

    13. Which of the following is correct?


    wt.
    a) Mole = molarity × 𝑉in L = mol. wt.
    wt.
    b) Milli mole = molarity × 𝑉in mL = mol. wt.
    × 1000
    c) Mole and milli mole of reactants react according to stoichiometric ratio of balanced chemical
    equation
    d)All of the above

    14. 100 g of CaCO3 is treated with 1 L of 1 N HCI. What would be the weight of CO2 liberated after
    the completion of the reaction?
    a) 55 g b) 11 g c) 22 g d)33 g

    15. If an iodized salt contains 1% KI and a person takes 2 g of the salt every day, the iodide ions
    going into his body every day would be approximately
    a) 7.2 × 1021 b) 7.2 × 1019 c) 3.6 × 1021 d)9.5 × 1019

    16. The mass of 11.2 L of ammonia gas at STP is


    a) 8.5 g b) 85 g c) 17 g d)1.7 g

    17. 0.52 g of dibasic acid required 100 mL of 0.1 𝑁 NaOH for complete neutralization. The
    equivalent weight of acid is:
    a) 26 b) 52 c) 104 d)156

    18. 100 tons of 𝐹𝑒2𝑂3 containing 20% impurities will give iron by reduction with 𝐻2 equal to
    a) 112 tons b) 80 tons c) 160 tons d)56 tons
    19. 25 mL of a solution of barium hydroxide on titration with 0.1 𝑀 solution of HCl gave a titre
    value of 35 mL. The molarity of Ba(OH)2 is:
    a) 0.28 b) 0.35 c) 0.07 d)0.14

    20. Volume occupied by one molecule of water (density = 1 g cm―3) is:


    a) 6.023 × 10―23cm3 b) 3.0 × 10―23cm3 c) 5.5 × 10―23cm3 d)9.0 × 10―23cm3

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