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12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Four

12th Standard EM

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25
    Answer all the questions
    25 x 1 = 25
  1. In the Ellingham diagram, for the formation of carbon monoxide

    (a)

    \(\left( \cfrac { \Delta { S }^{ 0 } }{ \Delta T } \right) \)

    (b)

    \(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is positive

    (c)

    \(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative

    (d)

    initially \(\left( \cfrac { \Delta T }{ \Delta { G }^{ 0 } } \right) \) is positive, after 700oC,\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative

  2. Identify the metal that occurs in free state

    (a)

    Al

    (b)

    Au

    (c)

    Mg

    (d)

    Ca

  3. The element that does not show catenation among the following p-block elements is

    (a)

    Carbon

    (b)

    silicon

    (c)

    Lead

    (d)

    germanium

  4. Group 14 elements have general electronic configuration _______

    (a)

    ns2

    (b)

    ns2np4

    (c)

    ns2np6

    (d)

    ns2np2

  5. On hydrolysis, PCl3 gives

    (a)

    H3PO3

    (b)

    PH3

    (c)

    H3PO4

    (d)

    POCl3

  6. A white crystalline salt (A) react with dilute HCl to liberate a suffocating gas (B) and also forms a yellow precipitate . The gas (B) turns potassium dichromate acidified with dil H2SO4 to a green coloured solution(C).  A, B and C are respectively

    (a)

    Na2SO3, SO2, Cr2(SO4)3

    (b)

    Na2S2O3, SO2, Cr2(SO4)3

    (c)

    Na2S, SO2,Cr2(SO4)3

    (d)

    Na2SO4, SO2, Cr2(SO4)3

  7. CrO3 is coloured due to

    (a)

    Low l.E

    (b)

    Crystal defects

    (c)

    Charge transfer spectra

    (d)

    Unpaired electrons

  8. Which one of the following pairs represents linkage isomers?

    (a)

    [Cu(NH3)4][ptCl4] and [pt(NH3)4][CuCl4]

    (b)

    [Co(NH3)5(NO3)]SO4 and [Co(NH3)5(ONO)]

    (c)

    [Co(NH3)4(NCS)2]ct and [Co(NH3)4(SCN)2]Cl

    (d)

    both (b) and (c)

  9. [Fe(H2O)6]3+ and [Fe(CN)6]3- differ in

    (a)

    magnetic nature

    (b)

    co-ordination number

    (c)

    oxidation number

    (d)

    Structure

  10. The geometry of [Ni(CN)4]2- is

    (a)

    Tetrahedral

    (b)

    Square planar

    (c)

    Triangular

    (d)

    Octahedral

  11. In an octahedral complex, the (n-1) d orbital are involved in hybridization. The complex is called _______________ complex

    (a)

    inner orbital

    (b)

    low spin

    (c)

    spin paired

    (d)

    all the above

  12. The vacant space in bcc lattice unit cell is

    (a)

    48%

    (b)

    23%

    (c)

    32%

    (d)

    26%

  13. Which one of the following does not belong to AB type?

    (a)

    Cu2O

    (b)

    CsCl

    (c)

    FeS

    (d)

    ZnS

  14. The force that binds a metal ion to a number of electrons within its sphere. of influence is known as__________ bond.

    (a)

    covalent

    (b)

    ionic

    (c)

    metallic

    (d)

    co-ordinate

  15. For a first order reaction, the rate constant is 6.909 min-1.the time taken for 75% conversion in minutes is

    (a)

    \(\left( \cfrac { 3 }{ 2 } \right) { log }^{ 2 }\)

    (b)

    \(\left( \cfrac { 2 }{ 3 } \right) log2\)

    (c)

    \(\left( \cfrac { 3 }{ 2 } \right) log\left( \cfrac { 3 }{ 4 } \right) \)

    (d)

    \(\left( \cfrac { 2 }{ 3 } \right) log\left( \cfrac { 4 }{ 3 } \right) \)

  16. The pH of 10-5M KOH solution will be

    (a)

    9

    (b)

    5

    (c)

    19

    (d)

    none of these

  17. In an electrical field, the particles of a colloidal system move towards cathode. The coagulation of the same sol is studied using K2SO4 (i), Na3 PO4 (ii),K4 [Fe(CN)6] (iii) and NaCl (iv) Their coagulating power should be

    (a)

    II > I>IV > III

    (b)

    III > II > I > IV

    (c)

    I> II > III > IV

    (d)

    none of these

  18. The intermediate compound formation theory applies to _______reactions

    (a)

    homogeneous

    (b)

    heterogeneous

    (c)

    both (a)& (b)

    (d)

    none of the above

  19. Which one of the following reduces tollens reagent

    (a)

    formic acid

    (b)

    acetic acid

    (c)

    benzophenone

    (d)

    none of these

  20. Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and cone.HCI. This is__________ reaction.

    (a)

    Clemmenson's reduction

    (b)

    Wolff krishner reduction

    (c)

    Rosenmmunds reduction

    (d)

    catalytic reduction

  21. Among the following, the reaction that proceeds through an electrophilic substitution, is :

    (a)

    (b)

    (c)

    (d)

  22. Amines have __________ odour.

    (a)

    carbolic

    (b)

    mustard oil

    (c)

    fishy

    (d)

    garlic

  23. Which of the following are epimers

    (a)

    D(+)-Glucose and D(+)-Galactose

    (b)

    D(+)-Glucose and D(+)-Mannose

    (c)

    Neither (a) nor (b)

    (d)

    Both (a) and (b)

  24. Insulin is an example of_______hormone.

    (a)

    paracrine

    (b)

    endocrine

    (c)

    autocrine

    (d)

    none of the above

  25. The drug used to induce sleep is

    (a)

    paracetamol

    (b)

    bithional

    (c)

    chloroquine

    (d)

    equanil

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