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12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Nine

12th Standard

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25
    Answer all the questions
    25 x 1 = 25
  1. Which among the following is not a borane?

    (a)

    B2H6

    (b)

    B3H6

    (c)

    B4H10

    (d)

    none of these

  2. On moving down the group 13, density ______

    (a)

    decreases

    (b)

    increases

    (c)

    First decreases then increases

    (d)

    remains same

  3. Among the following the correct order of acidity is

    (a)

    HClO2 < HClO < HClO3 < HClO4

    (b)

    HClO4 < HClO2 < HClO < HClO3

    (c)

    HClO3 < HClO4 < HClO2 < HClO

    (d)

    HClO < HClO2 < HClO3 < HClO4

  4. Permanganate ion changes to ________ in acidic medium

    (a)

    MnO42−

    (b)

    Mn2+

    (c)

    Mn3+

    (d)

    MnO2

  5. A complex in which the oxidation number of the metal is zero is

    (a)

    K4[fe(CN)6]

    (b)

    [Fe(CN)3(NH3)5]

    (c)

    [Fe(CO)5]

    (d)

    both (b) and (c)

  6. IUPAC name of H2[Ptcl6] is

    (a)

    Hexa chloridoplatinum (IV) acid

    (b)

    Hexa chloridoplatinum (IV) acid

    (c)

    Hexachloridoplatinic (IV) acid

    (d)

    Dihydrogenhexaehloro platinate (IV)

  7. Amorphous solids can also be called _______

    (a)

    pseudo solids

    (b)

    true solids

    (c)

    super cooled liquids

    (d)

    both (a) & (c)

  8. For the reaction, 2NH3 ⟶ N2 + 3H2, if \(\frac { -d[NH_{ 3 }] }{ dt } \)=k1[NH3], \(\frac { d[N_{ 2 }] }{ dt } =k_{ 2 }[NH_{ 3 }],\frac { d[{ H }_{ 2 }] }{ dt } \)=k3[NH3] then the relation between k1, k2 and k3 is

    (a)

    k1=k2=k3

    (b)

    k1=3k2=2k3

    (c)

    1.5k1=3k2=k3

    (d)

    2k1=k2=3k3

  9. Activation energy of a reactant is reduced by ___________________

    (a)

    increased temperature

    (b)

    reduced temperature

    (c)

    increased pressure

    (d)

    reduced pressure

  10. pH of a saturated solution of Ca(OH)2 is 9. The Solubility product ( Ksp) of Ca(OH)2

    (a)

    0.5 ×10-15

    (b)

    0.25 ×10-10

    (c)

    0.125 ×10-15

    (d)

    0.5 ×10-10

  11. A solution which is resistant to changes of pH on addition of small amounts of an acid or a base is known as

    (a)

    buffer solution

    (b)

    true solution

    (c)

    isohydric solutionideal solution

    (d)

    ideal solution

  12. The Tyndall's effect associated with colloidal particles is due to

    (a)

    presence of charge

    (b)

    scattering of light

    (c)

    absorption of light

    (d)

    reflection of light

  13. Lucas test is used to distinguish 10, 20 and 30 

    (a)

    amines

    (b)

    nitro compound

    (c)

    alcohols

    (d)

    all the above

  14. Assertion: p – N, N – dimethyl amino benzaldehyde undergoes benzoin condensation
    Reason: The aldehydic (-CHO) group is meta directing.
    Codes:
    (A) if both assertion and reason are true and reason is the correct explanation of assertion.
    (B) if both assertion and reason are true but reason is not the correct explanation of assertion.
    (C) assertion is true but reason is false
    (D) both assertion and reason are false

    (a)

    if both assertion and reason are true and reason is the correct explanation of assertion.

    (b)

    if both assertion and reason are true but reason is not the correct explanation of assertion.

    (c)

    assertion is true but reason is false

    (d)

    both assertion and reason are false

  15. Acetic acid when heated with HI/P gives

    (a)

    methane

    (b)

    ethane

    (c)

    propane

    (d)

    acetaldehyde

  16. On hydrolysis nitro ethane gives

    (a)

    methyl amine and hydroxyl amine

    (b)

    acetic acid and methyl amine

    (c)

    acetic acid and hydroxyl amine

    (d)

    formic acid and hydroxyl amine

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

    (a)

    DNA

    (b)

    Enzymes

    (c)

    Harmones

    (d)

    Vitamins

  18. An example of non-protein amino acid is

    (a)

    Alanine

    (b)

    orinithine

    (c)

    proline

    (d)

    serine

  19. Pick the vitamin among the following acids?

    (a)

    Ascorbic acid

    (b)

    Acetic acid

    (c)

    Cinnamic acid

    (d)

    Aspartic acid

  20. A mixture ofD (+) glucose and D (-) fructose is known as__________

    (a)

    cane sugar

    (b)

    sweetless sugar

    (c)

    invert sugar

    (d)

    starch sugar

  21. Nucleic acid is made up of__________

    (a)

    an organicbase

    (b)

    a sugar unit

    (c)

    phosphoric acid

    (d)

    all of these

  22. Primary structure of proteins refer to_________

    (a)

    amino acid present

    (b)

    the shapeof protein molecule

    (c)

    the peptide bond

    (d)

    the sequenceof amino acid

  23. The precipitation of protein is called_________

    (a)

    peptisation

    (b)

    denaturation

    (c)

    renaturation

    (d)

    none of these

  24. The drug used in major surgical procedure is ________

    (a)

    procaine

    (b)

    lidocaine

    (c)

    propofol

    (d)

    morphine

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