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

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. Which of the following statements is not true?

    (a)

    on passing H2S, through acidified K2Cr2O7 solution, a milky colour is observed

    (b)

    Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis

    (c)

    K2Cr2O7 solution in acidic medium is orange in colour

    (d)

    K2Cr2O7 solution becomes yellow on increasing the PH beyond 7

  3. The primary and secondary valencies of [CoCl2(en)2]SO4 are respectively_____________

    (a)

    4, 6

    (b)

    2, 4

    (c)

    4, 4

    (d)

    6, 4

  4.  if ‘a’ stands for the edge length of the cubic system ; sc , bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively

    (a)

    \(\left( \cfrac { 1 }{ 2 } a;\cfrac { \sqrt { 3 } }{ 2 } a;\cfrac { \sqrt { 2 } }{ 2 } a \right) \)

    (b)

    \(\left( \sqrt { 1a } :\sqrt { 3a } :\sqrt { 2a } \right) \)

    (c)

    \(\left( \cfrac { 1 }{ 2 } a:\cfrac { \sqrt { 3 } }{ 4 } a:\cfrac { 1 }{ 2\sqrt { 2 } } a \right) \)

    (d)

    \(\cfrac { 1 }{ 2 } a:\sqrt { 3 } a:\cfrac { 1 }{ \sqrt { 2 } } a\)

  5. On which of the following properties does the coagulating power of an ion depend ?

    (a)

    Both magnitude and sign of the charge on the ion.

    (b)

    Size of the ion alone

    (c)

    the magnitude of the charge on the ion alone

    (d)

    the sign of charge on the ion alone.

  6. Williamson synthesis of preparing dimethyl ether is a / an /

    (a)

    SN1 reactions

    (b)

    SN2 reaction

    (c)

    electrophilic addition

    (d)

    electrophilic substitution

  7. Higher alcohols are not soluble in water because of

    (a)

    hydrophilic alkyl group

    (b)

    hydrophobic alkyl groups

    (c)

    hydrophilic aryl group

    (d)

    hydrophobic aryl groups

  8. Which of the following produces ether, when heated with cone, H2SO4 at 413 K?

    (a)

    Organic acid

    (b)

    Aldehyde

    (c)

    Alcohol

    (d)

    Ketone

  9. Consider the following reaction   X, Y and Z respectively are ________

    (a)

    (b)

    C2H4, C2H5COCI, C2H5OH

    (c)

    (d)

  10. The IUPAC name of  is __________

    (a)

    2-methoxy propane

    (b)

    ethoxy benzene

    (c)

    2-methoxy-2-methyl propane

    (d)

    2-methyl-l-butane

  11. The acitve component of dynamite is _______

    (a)

    keiselghur

    (b)

    nitro glycerine

    (c)

    nitro benzene

    (d)

    trinitro toluene

  12. Oxidation of glycerol with bismuth nitrate gives ________

    (a)

    meso-oxalic acid

    (b)

    glyceric acid

    (c)

    tartronic acid

    (d)

    both (b) and (c)

  13. The number of possible isomers for molecular formula C3H8O is _______

    (a)

    2

    (b)

    3

    (c)

    7

    (d)

    4

  14. The IUPAC name of the compound

    (a)

    4 - methoxy - 2 - nitro benzaldehyde

    (b)

    4 methoxy - 6 - nitro benzaldehyde

    (c)

    2 - formyl- 5 - methoxynitrobenzene

    (d)

    4 formyl - 5 - nitroanisole

  15. When acetaldehyde is heated with Fehling's solution, it gives a precipitate of

    (a)

    Cu2O

    (b)

    CuO

    (c)

    CuO+Cu2O

    (d)

    Cu

  16. Give the stucture of 3-phenyl-2-propanal

    (a)

    CH2=CH-CHO

    (b)

    CH3CHOH-CH2CHO

    (c)

    C6H5CH=CH-CHO

    (d)

    CH3-CH=CH-CHO

  17. Which is unstable?

    (a)

    HCOOH

    (b)

    CH3CH2COCl

    (c)

    CH3COCl

    (d)

    HCOCl

  18. Acetone reacting with HCN to form cyanohydrin is ________ type of reaction.

    (a)

    Nucleophilicaddition

    (b)

    Electrophilic substitution

    (c)

    Freeradical substitution

    (d)

    Redox

  19. Benzoin is _________.

    (a)

    an ∝ -hydroxy aldehyde

    (b)

    β- hydroxy aldehyde

    (c)

    β-hydroxy ketone

    (d)

    α - hydroxy ketone

  20. Aldol is _________.

    (a)

    HCHO

    (b)

    CH3CHO

    (c)

    (CH3)2CO

    (d)

    C6H5CH2CHO

  21. Nitration of nitrobenzene results in

    (a)

    o-dinitrobenzene

    (b)

    1,3,5 trinitrobenzene

    (c)

    m-dinitrobenzene

    (d)

    p-dinitrobenzene

  22. Which of the following cannot be prepared by Sandmeyer's reaction?

    (a)

    Iodobenzene

    (b)

    Fluorobenzene

    (c)

    both Iodobenzene and Fluorobenzene

    (d)

    neither Iodobenzene and Fluorobenzene

  23. Which among the following exists as zwitter ion?

    (a)

    sulphanilic acid

    (b)

    salicylic acid

    (c)

    acetanilide

    (d)

    all the above

  24. Nitromethane condenses with acetaldehyde to give

    (a)

    nitro propane

    (b)

    1-nitro-2-propanol

    (c)

    2-nitro-1-propanol

    (d)

    3-nitro propanol

  25. The basic character of amines is due to the

    (a)

    tetrahedral structure

    (b)

    presence of nitrogen atom

    (c)

    lone pair of electrons on nitrogen atom

    (d)

    high eleetronegativity of nitrogen

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