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

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. Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

    (a)

    \(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS2 and H2S

    (b)

    \(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide

    (c)

    Roasting of the sulphide to its oxide is thermodynamically feasible

    (d)

    Carbon and hydrogen are suitable reducing agents for metal sulphides

  2. Electrochemical process is used to extract

    (a)

    Iron

    (b)

    Lead

    (c)

    Sodium

    (d)

    silver

  3. Cinnabar is the sulphide ore of_________metal.

    (a)

    Zn

    (b)

    Pb

    (c)

    Hg

    (d)

    Ag

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

    (a)

    Carbon

    (b)

    silicon

    (c)

    Lead

    (d)

    germanium

  5. In the brown ring test, brown colour of the ring is due to

    (a)

    a mixture of No and NO2

    (b)

    Nitroso ferrous sulphate

    (c)

    Ferrous nitrate

    (d)

    Ferric nitra

  6. The magnetic moment of Mn2+ ion is

    (a)

    5.92BM

    (b)

    2.80BM

    (c)

    8.95BM

    (d)

    3.90BM

  7. A magnetic moment of 1.73BM will be shown by one among the following (NEET)

    (a)

    TiCl4

    (b)

    [CoCl6]4-

    (c)

    [Cu(NH3)4]2+

    (d)

    [Ni(CN)4]2-

  8. The number of carbon atoms per unit cell of diamond is

    (a)

    8

    (b)

    6

    (c)

    1

    (d)

    4

  9. For a first order reaction A ⟶ product with initial concentration x mol L-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L-1 the half life is

    (a)

    (2.5 x 2) hours

    (b)

    \(\left( \frac { 2.5 }{ 2 } \right) \)hours

    (c)

    2.5 hours

    (d)

    Without knowing the rate constant, t1/2 cannot be determined from the given data

  10. While charging lead storage battery

    (a)

    PbSO4 on cathode is reduced to Pb

    (b)

    PbSO4 on anode is oxidised to PbO2

    (c)

    PbSO4 on anode is reduced to Pb

    (d)

    PbSO4 on cathode is oxidised to Pb

  11. Methyl ketones are usually characterised by

    (a)

    the Fehling's solution

    (b)

    the iodoform test

    (c)

    the Schiff's test

    (d)

    the Tollen's reagent

  12. The acid that cannot be prepared by Grignard reagent

    (a)

    acetic acid

    (b)

    formic acid

    (c)

    butyric acid

    (d)

    benzoic acid

  13. Which of the following reaction is not correct.

    (a)

    CH3 CH2 NH2 \(\overset { { HNO }_{ 2 } }{ \longrightarrow } \)CH2 CH2 OH + N2 

    (b)

    (c)

    CH2 CONH2 \(\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } \)CH NH2

    (d)

    none of these


  14. The above structure represents

    (a)

    Vitamin B12

    (b)

    Vitamine B6

    (c)

    dopamine

    (d)

    Histamine

  15. Which among the following exists as zwitter ion?

    (a)

    sulphanilic acid

    (b)

    salicylic acid

    (c)

    acetanilide

    (d)

    all the above

  16. Which gives an yellow oil with nitrous acid?

    (a)

    1° amine

    (b)

    2° amine

    (c)

    3° amine

    (d)

    quarternary salt

  17. Which of the following nitro-compounds behave as an acid in the presence of strong alkali?

    (a)

    Primary

    (b)

    Secondary

    (c)

    Tertiary

    (d)

    Primary and Secondary

  18. Oil of mirbane is ________

    (a)

    nitrobenzene

    (b)

    benzaldehyde

    (c)

    methyl salicylate

    (d)

    aspirin

  19. Two amino acids say A, B react to give

    (a)

    two dipeptides

    (b)

    three dipeptides

    (c)

    four dipeptides

    (d)

    only one

  20. Fructose on reduction with HI/P gives

    (a)

    n-hexane

    (b)

    iso-hexane

    (c)

    10alcohol

    (d)

    no reaction

  21. The ultimate product of hydrolysis of starch in the presence of dilute acid is

    (a)

    dextrin

    (b)

    maltose

    (c)

    maltase

    (d)

    glucose

  22. The disaccharide found in milk of mammals and referred as milk sugar is________

    (a)

    Lactose

    (b)

    Engthrose

    (c)

    Galactose

    (d)

    Erythrulose

  23. The general formula of carbohydrates is_____

    (a)

    Cn(H2O)

    (b)

    Cn(H2O)

    (c)

    C(H2O)n

    (d)

    H(CO2)

  24. Amino acids are bifunctional containing________group.

    (a)

    CHO and COOH

    (b)

    OH and COOH

    (c)

    NH2and COOHp

    (d)

    NO2 and COOH

  25. The sugar unit present in nucleic acid is___________

    (a)

    a hexose

    (b)

    tetrose

    (c)

    pentose

    (d)

    glucose

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