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12th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions with Answer Key 2020

12th Standard

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25
    Answer all the questions
    25 x 1 = 25
  1. Which one of the following is not feasible

    (a)

    Zn(s) + Cu2+(aq) \(\rightarrow\) Cu(s) + Zn2+(aq)

    (b)

    Cu(s)+ Zn2+(aq)\(\rightarrow\) Zn(s) + Cu2+(aq)

    (c)

    Cu(s) + 2Ag+(ag)\(\rightarrow\) 2Ag(s) + Cu2+(aq)

    (d)

    Fe(s) + Cu2+(aq) \(\rightarrow\) Cu(s)+ Fe2+(aq)

  2. The percentage of carbon in high carbon steel is_________.

    (a)

    0.5 - 1%

    (b)

    0.15 - 1.5%

    (c)

    0.15 - 1.5%

    (d)

    0.15 - 0.3%

  3. Which of the following metals has the largest abundance in the earth’s crust?

    (a)

    Aluminium

    (b)

    Calcium

    (c)

    Magnesium

    (d)

    Sodium

  4. On hydrolysis, PCl3 gives________.

    (a)

    H3PO3

    (b)

    PH3

    (c)

    H3PO4

    (d)

    POCl3

  5. Assertion: Bond dissociation energy of fluorine is greater than chlorine gas
    Reason: Chlorine has more electronic repulsion than fluorine.
    Codes:
    a) Both assertion and reason are true and reason is the correct explanation of assertion.
    b) Both assertion and reason are true but reason is not the correct explanation of assertion
    c) Assertion is true but reason is false
    d) Both assertion and reason are false

    (a)

    Both assertion and reason are true and reason is the correct explanation of assertion.

    (b)

    Both assertion and reason are true but reason is not the correct explanation of assertion

    (c)

    Assertion is true but reason is false

    (d)

    Both assertion and reason are false

  6. Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

    (a)

    Br2 > I2 > F2 > Cl2

    (b)

    F2 > Cl2 > Br2 > l2

    (c)

    I2 > Br2 > Cl2 > F2

    (d)

    Cl2 > Br2 > F2 > I2

  7. The incorrect statement regarding structure of ozone is______.

    (a)

    Bond angle is less than 120°

    (b)

    It is linear

    (c)

    The two oxygen-oxygen bond length in ozone are identical

    (d)

    Both (b) and (c).

  8. The alloy of copper that contain Zinc is________.

    (a)

    Monel metal

    (b)

    Bronze

    (c)

    bell metal

    (d)

    brass

  9. Which one of the following statements related to lanthanons is incorrect?

    (a)

    Europium shows +2 oxidation state

    (b)

    The basicity decreases as the ionic radius decreases from Pr to Lu.

    (c)

    All the lanthanons are much more reactive than aluminium

    (d)

    Ce4+ solutions are widely used as oxidising agents in volumetric analysis.

  10. Oxygen stabilises higher oxidation state because_______.

    (a)

    it is electronegative

    (b)

    of its tendency to form multiple bond

    (c)

    of large size

    (d)

    of small size

  11. Electrode potential of M2+/M for Ni is abnormal because of ________.

    (a)

    high lE1 + E2

    (b)

    high hydration energy

    (c)

    ΔH atomisation

    (d)

    Electronic configuration of Ni2+

  12. A complex has a molecular formula MSO4Cl.6H2O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

    (a)

    [M(H2O)4Cl]SO4.2H2O

    (b)

    [M(H2O)6]SO4

    (c)

    [M(H2O)5Cl]SO4.H2O

    (d)

    [M(H2O)3Cl]SO4.3H2O

  13. A magnetic moment of 1.73BM will be shown by one among the following.

    (a)

    TiCl4

    (b)

    [CoCl6]4-

    (c)

    [Cu(NH3)4]2+

    (d)

    [Ni(CN)4]2-

  14. How many geometrical isomers are possible for [Pt(Py)(NH3)(Br)(Cl)]?

    (a)

    3

    (b)

    4

    (c)

    0

    (d)

    15

  15. Which of the following octahedral complexes do not show geometrical isomerism?

    (a)

    [Co(NH3)3Cl3]

    (b)

    [PtCl2(NH3)4]

    (c)

    [Pt(NH3)2Cl2]

    (d)

    [Co(en)3]3+

  16. The geometry of complex ion [Fe(CN)6]4- is _______.

    (a)

    tetrahedral

    (b)

    square planar

    (c)

    octahedral

    (d)

    triangular

  17. Werner's theory was not able to explain_______ of coordination compounds.

    (a)

    colour

    (b)

    magnetic properties

    (c)

    both (a) and (b)

    (d)

    neither (a) nor (b)

  18. Magnetic moment is given by the formula _______.

    (a)

    \(\sqrt { n(n+1) } \)

    (b)

    \(\sqrt { n(n+2) } \)

    (c)

    \(\sqrt { (n+2) } \)

    (d)

    \(\sqrt { { n }^{ 2 }+(n+2) } \)

  19. The ratio of close packed atoms to tetrahedral hole in cubic packing is ________.

    (a)

    1:1

    (b)

    1:2

    (c)

    2:1

    (d)

    1:4

  20. In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are ________.

    (a)

    4 and 2

    (b)

    6 and 6

    (c)

    8 and 4

    (d)

    4 and 8

  21. An example of metal deficiency defect _______.

    (a)

    NaCl

    (b)

    AgCl

    (c)

    CsCl

    (d)

    FeS

  22. Three atoms P, Q and R crystallize in a cubic solid lattice having P atom at corners Q atom at body centre and R atom at the face centres. Identify formula of the compound _______.

    (a)

    PQR

    (b)

    PQR2

    (c)

    PQR3

    (d)

    P3QR

  23. Which one of the following statements is not true?

    (a)

    The heat of vaporisation of ionic crystals are high

    (b)

    Ionic crystals are soluble in non-polar solvent

    (c)

    Ionic crystals are hard and brittle

    (d)

    Ionic crystals are conductors in solution state

  24. Which one of the following is a network solid?

    (a)

    diamond

    (b)

    silicon carbide

    (c)

    naphthalene

    (d)

    both (a) and (b)

  25. The type of crystal system shown is ______.

    (a)

    Cubic

    (b)

    Orthorhombic

    (c)

    Mono clinic

    (d)

    Tetragonal

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