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

12th Standard

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25
    Answer all the questions
    25 x 1 = 25
  1. In the extraction of aluminium from alumina by electrolysis, cryolite is added to

    (a)

    Lower the melting point of alumina

    (b)

    Remove impurities from alumina

    (c)

    Decrease the electrical conductivity

    (d)

    Increase the rate of reduction

  2. AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

    (a)

    K3[AIF3H3]

    (b)

    K3[AiF6]

    (c)

    AIH3

    (d)

    K[AIF3H]

  3. On oxidation with iodine, sulphite ion is transformed to

    (a)

    S4O62-

    (b)

    S2O62-

    (c)

    SO42-

    (d)

    SO32-

  4. hot concentrated H2SO4 is miderately strong oxidising agent which of the following reactions does not show oxidising behaviour?

    (a)

    \(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)

    (b)

    \(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)

    (c)

    \(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)

    (d)

    \({ CaF }_{ 2 }+{ H }_{ 2 }SO_{ 4 }\longrightarrow { CaCO }_{ 4 }+2HF\)

  5. Which of the following lanthanoid ions is diamagnetic?

    (a)

    Eu2+

    (b)

    Yb2+

    (c)

    Ce2+

    (d)

    Sm2+

  6. Solid CO2 is an example of

    (a)

    Covalent solid

    (b)

    metallic solid

    (c)

    molecular solid

    (d)

    ionic solid

  7. The crystal with a metal deficiency defect is

    (a)

    NaCl

    (b)

    FeO

    (c)

    ZnO

    (d)

    KCl

  8. If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is

    (a)

    Zero

    (b)

    one

    (c)

    Fraction

    (d)

    none

  9. Addition of sodium chloride to a saturated solution of silver chloride

    (a)

    dissociation of AgCI increases

    (b)

    concentration of CI- decreases

    (c)

    dissociation of AgCl- decreases

    (d)

    concentration of Ag+ increases

  10. Faradays constant is defined as

    (a)

    charge carried by 1 electron

    (b)

    charge carried by one mole of electrons

    (c)

    charge required to deposit one mole of substance

    (d)

    charge carried by 6.22 ×1010 electrons

  11. The laws of electrolysis were enunciated first by

    (a)

    Dalton

    (b)

    Faraday

    (c)

    Kekule

    (d)

    Avogadro

  12. Auto catalysis is observed in the reaction given below.
    CH3COOC2H5+H2O➝ CH3COOH+C2H5OH

    (a)

    CH3COOC2H5

    (b)

    H2O

    (c)

    CH3COOH

    (d)

    C2H5OH

  13. The correct IUPAC name of the compound, 

    (a)

    4 – chloro – 2,3 – dimethyl pentan – 1-ol

    (b)

    2,3 – dimethyl – 4- chloropentan -1-ol

    (c)

    2,3,4 – trimethyl – 4- chlorobutan -1-ol

    (d)

    4– chloro – 2,3,4 – trimethyl pentan – 1-ol

  14. Which has the highest boiling point?

    (a)

    CH3CH3

    (b)

    CH3OH

    (c)

    C2H5OH

    (d)

    C3H5

  15. \({ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y \ 'Y'\) is

    (a)

    Formaldelyde

    (b)

    di acetone ammonia

    (c)

    hexamethylene tetraamine

    (d)

    oxime

  16. A compound 'X' when mixed with ethanol and a drop of concentrated H2SO4 gave a compound with fruity odour. Identify 'X'.

    (a)

    HCHO

    (b)

    CH3OH

    (c)

    CH3COOH

    (d)

    CH3NH2

  17. P Product ‘P’ in the above reaction is

    (a)

    (b)

    (c)

    (d)

  18. Nitrobenzene on electrolytic reduction in con. sulphuric acid, the intermediate formed is

    (a)

    C6H5NH - NHC6H5

    (b)

    C6H5 - NHOH

    (c)

    C6H5 - N = N - C6H5

    (d)

    C6H5HSO4

  19. Which one of the following is not produced by body?

    (a)

    DNA

    (b)

    Enzymes

    (c)

    Harmones

    (d)

    Vitamins

  20. Which among the following contains triglyceride?

    (a)

    Wax

    (b)

    Cooking oil

    (c)

    Essential oil

    (d)

    Albumin

  21. Carbohydrates are

    (a)

    polyhydroxy aldehydes

    (b)

    polyhydroxy ketones

    (c)

    polyhydroxy acids

    (d)

    both (a) and (b)

  22. Non stick cook wares generally have a coating of a polymer, whose monomer is

    (a)

    ethane

    (b)

    prop-2-enenitrile

    (c)

    chloroethene

    (d)

    1,1,2,2-tetrafluoroethane

  23. Which one of the following is employed as antihistamine?

    (a)

    azithromycin

    (b)

    ciprofloxacin

    (c)

    cetirizine

    (d)

    neomycin

  24. Oxidation of fats and oils is prevented by ____________.

    (a)

    BHT(Butyl hydroxy toluene)

    (b)

    BHA(Butyl hydroxy anisole)

    (c)

    Both (a) and (b)

    (d)

    Neither (a) nor (b)

  25. Glyptal is a polymer of _______

    (a)

    ethylene glycol and terypthaliic acid

    (b)

    ethylene glycol and pthalic acid

    (c)

    adipic acid and hexamethelene diamine

    (d)

    phenol and formaldehyde

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