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12th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions

12th Standard

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Chemistry

Time : 00:10:00 Hrs
Total Marks : 10
    Answer all the questions
    10 x 1 = 10
  1. Bauxite has the composition ______.

    (a)

    Al2O3

    (b)

    Al2O3.nH2O

    (c)

    Fe2O3.2H2O

    (d)

    None of these

  2. An aqueous solution of borax is________.

    (a)

    neutral

    (b)

    acidic

    (c)

    basic

    (d)

    amphoteric

  3. In which of the following, NH3 is not used?

    (a)

    Nessler’s reagent

    (b)

    Reagent for the analysis of IV group basic radical

    (c)

    Reagent for the analysis of III group basic radical

    (d)

    Tollen’s reagent

  4. Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.

    (a)

    both Sc3+ and Zn2+ ions are colourless and form white compounds

    (b)

    In case of Sc, 3d orbital are partially filled but in Zn these are completely filled

    (c)

    last electron as assumed to be added to 4s level in case of zinc

    (d)

    both Sc and Zn do not exhibit variable oxidation states

  5. The sum of primary valence and secondary valence of the metal M in the complex [M(en)2(Ox)]Cl is________.

    (a)

    3

    (b)

    6

    (c)

    -3

    (d)

    9

  6. Graphite and diamond are ________.

    (a)

    Covalent and molecular crystals

    (b)

    ionic and covalent crystals

    (c)

    both covalent crystals

    (d)

    both molecular crystals

  7. For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M, the concentration of A after one hour is given by the expression.

    (a)

    001. e−x

    (b)

    1 x 10-2(1-e-60x)

    (c)

    (1 x 10-2)e-60x

    (d)

    none of these

  8. Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.24 ×10-4mol L-1 solubility product of Ag2C2O4 is_______.

    (a)

    2.42 × 10-8mol3L-3

    (b)

    2.66 × 10-12mol3L-3

    (c)

    4.5 × 10-11mol3L-3

    (d)

    5.619 × 10-12mol3L-3

  9. The number of electrons that have a total charge of 9650 coulombs is_______.

    (a)

    6.22 ×1023

    (b)

    6.022 ×1024

    (c)

    6.022 ×1022

    (d)

    6.022 ×10−34

  10. For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.

    (a)

    \(\frac{1}{n}\), K

    (b)

    log\(\frac{1}{n}\), K

    (c)

    \(\frac{1}{n}\), log K

    (d)

    log \(\frac{1}{n}\), log K

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