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

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. Zinc is obtained from ZnO by

    (a)

    Carbon reduction

    (b)

    Reduction using silver

    (c)

    Electrochemical process

    (d)

    Acid leaching

  2. Sodium cyanide solution is used to extract _________from its ores

    (a)

    copper

    (b)

    silver

    (c)

    gold

    (d)

    both (b) and (c)

  3. The basic structural unit of silicates is (NEET)

    (a)

    \(\left( SiO_{ 3 } \right) ^{ 2- }\)

    (b)

    \(\left( SiO_{ 4 } \right) ^{ 2- }\)

    (c)

    \(\left( Sio \right) ^{ - }\)

    (d)

    \(\left( SiO_{ 4 } \right) ^{ 4- }\)

  4. The basicity of pyrophosphorous acid ( H4P2O5) is

    (a)

    4

    (b)

    2

    (c)

    3

    (d)

    5

  5. XeF6 on complete hydrolysis produces

    (a)

    XeOF4

    (b)

    XeO2F2

    (c)

    XeO3

    (d)

    XeO2

  6. Helium is used in balloons in the place of, hydrogen because it is________

    (a)

    incombustible

    (b)

    radioactive and detected easily

    (c)

    lighter than hydrogen

    (d)

    both (a) and(c)

  7. Which is a double salt?

    (a)

    K2SO4AI2(SO4)324H2O

    (b)

    NaCI

    (c)

    K4[Fe(CN)6]

    (d)

    KCl

  8. The number of chloride ions that surrounds the central Na" ion in NaCl crystal is_________.

    (a)

    12

    (b)

    8

    (c)

    6

    (d)

    4

  9. Krepresents

    (a)

    ionic product constant of water

    (b)

    Solubility product of water

    (c)

    Equilibrium constant of water

    (d)

    Buffer index

  10. The emf generated by an electrochemical cell is given by the symbol

    (a)

    E

    (b)

    M

    (c)

    F

    (d)

    S

  11. The oxidation of sodium sulphite by air is retarded by

    (a)

    MnO2

    (b)

    H2S

    (c)

    Alcohol

    (d)

    AS2O3

  12. Secondary alcohol on oxidation gives

    (a)

    aldehyde

    (b)

    ketone

    (c)

    ester

    (d)

    anhydride

  13. The common name for 4-hydroxy toluene is ________

    (a)

    p-cresol

    (b)

    m-cresol

    (c)

    resoricinol

    (d)

    catechol

  14. Chloretone is an addition product of

    (a)

    CH3CHO, HCHP

    (b)

    CH3CHO,CHCl3

    (c)

    \({ CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CCl }_{ 4 }\)

    (d)

    \(\\ { CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CHCl }_{ 4 }\)

  15. Primary alcohol on oxidation gives

    (a)

    aldehyde

    (b)

    ketones

    (c)

    both (a) and (b)

    (d)

    neither

  16. The order of reactivity of carboxylic acid derivatives is _______

    (a)

    Acid chloride > Ester > Amide > Acid anhydride

    (b)

    Acid chloride > Acid anhydride > Ester > Amide

    (c)

    Acid chloride> Amide> Acid anhydride> Ester

    (d)

    Acid anhydride > Ester> Amide> Acid chloride

  17. The reduction of CH3 - CH2 - C ☰ N with sodium and alcohol results in the formation of

    (a)

    \({ CH }_{ 3 }-\underset { \overset { | }{ { NH }_{ 2 } } }{ CH } -{ CH }_{ 3 }\)

    (b)

    CH3- CH2- CH2- OH + N2

    (c)

    CH3 - CH2 - CH2 - NH2

    (d)

    CH3 - CH2 - NH2

  18. Which among the following is a tertiary nitro compound?

    (a)

    \({ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { NO }_{ 2 } } }{ C } } -{ CH }_{ 3 }\)

    (b)

    \({ CH }_{ 2 }-\overset { \underset { | }{ { NO }_{ 2 } } }{ CH } -{ CH }_{ 3 }\)

    (c)

    CH3CH2CH2 - NO2

    (d)

    \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }{ NO }_{ 2 }\)

  19. Which of the following will not undergo Hoffman's bromamide reaction?

    (a)

    Ethanamide

    (b)

    Propanamide

    (c)

    Methanamide

    (d)

    Phenyl methanamide

  20. The reagent that cannot be used for the conversion of C6H5NO2 ➝ C6H5NH2

    (a)

    Sn/HCI

    (b)

    LiAlH4

    (c)

    H2/Ni

    (d)

    Zn/NaOH

  21. CH3CONH\(\underrightarrow { { Br }_{ 2 }/KOH } \) CH3NH2 + CO2. This is _________ reaction.

    (a)

    Hoffman bromamide

    (b)

    HVZ

    (c)

    Gabriel phthalimide

    (d)

    Gomberg Bachmann

  22. Oxidation of aniline with acidified K2Cr2O7 gives ___________

    (a)

    p-benzoquinone

    (b)

    benzoic acid

    (c)

    benzaldehyde

    (d)

    benzyl alcohol

  23. Sucrose is commonly known as_________

    (a)

    fruit sugar

    (b)

    table sugar

    (c)

    grape sugar

    (d)

    table salt

  24. Ribose is_________

    (a)

    Ketopentose

    (b)

    Ketotetrose

    (c)

    Aldotriose

    (d)

    Aldopentose

  25. The optically inactive amino acid is_______

    (a)

    glycine

    (b)

    alanine

    (c)

    proline

    (d)

    phenylalanine

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