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

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. Electrochemical process is used to extract

    (a)

    Iron

    (b)

    Lead

    (c)

    Sodium

    (d)

    silver

  2. Oxidation state of carbon in its hydrides

    (a)

    +4

    (b)

    -4

    (c)

    +3

    (d)

    +2

  3. Group 14 elements have general electronic configuration _______

    (a)

    ns2

    (b)

    ns2np4

    (c)

    ns2np6

    (d)

    ns2np2

  4. the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

    (a)

    their magnetic behaviour

    (b)

    their unfilled d orbitals

    (c)

    their ability to adopt variable oxidation states

    (d)

    their chemical reactivity

  5. The hypothetical complex triamminediaqua chloridocobalt (III)chloride can be represented as

    (a)

    [Co(NH3)3(H2O)2Cl]Cl2

    (b)

    [Co(NH)3(H2O)Cl3]

    (c)

    [Co(NH2)3(H2O)2Cl]

    (d)

    [Co(NH3)3(H2O)3]Cl3

  6. The structure of hexaaquatitanium (III) ion is __________

    (a)

    [Ti(H2O)6]3+

    (b)

    [Ti(H2O)6]3-

    (c)

    [Ti(H2O)5]H2O

    (d)

    [Ti(H2O)6]

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

    (a)

    8

    (b)

    6

    (c)

    1

    (d)

    4

  8. 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

  9. For a reaction, Ea = 0 and k = 4.2 x l05 sec-1 at 300 K, the value of kat 310 Kwill be ______________

    (a)

    4.2 x 105 sec-1

    (b)

    8.4 x 105 sec-1

    (c)

    8.4 x 105 sec-1

    (d)

    unpredictable 

  10. The solubility of BaSO4 in water is 2.42 ×10-3gL-1 at 298K. The value of its solubility product(Ksp) will be (Given molar mass of BaSO4 =233g mol 4-1)

    (a)

    1.08 ×10-14mol2L-2

    (b)

    1.08 ×10-12mol2L-2

    (c)

    1.08 ×10-10mol2L-2

    (d)

    1.08 ×10-8mol2L-2

  11. In the electrochemical cell: Zn|ZnSO4 (0.01M)|| CuSO4 (1.0M)| Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0M and that CuSO4 changed to 0.01M, the emf changes to E2. From the followings, which one is the relationship between E1 and E2?

    (a)

    E1 < E2

    (b)

    E1 > E2

    (c)

    E2=0 \(\uparrow\)E1

    (d)

    E1=E2

  12. The emf of a cell with 1 M solution of reactants and products in solution at 25°C is called

    (a)

    Half cell potential

    (b)

    Standard emf

    (c)

    Single electrode potential

    (d)

    Redox potential

  13. Argyrol is__________

    (a)

    colloidal silver

    (b)

    colloidal antimony

    (c)

    colloidal gold

    (d)

    milk of magnesia

  14.  is an example of ________

    (a)

    Simple

    (b)

    mixed

    (c)

    aliphatic

    (d)

    both (a) and (c)

  15. Isomerism exhibited by ethylene glycol is ________

    (a)

    position isomerism

    (b)

    chain isomerism

    (c)

    functional isomerism

    (d)

    both (a) and (c)

  16. Benzoic acid \(\overset { i){ NH }_{ 3 } }{ \underset { ii)\Delta }{ \longrightarrow } } A\overset { NaOBr }{ \longrightarrow } B\overset { NaN{ O }_{ 2 }/HCl }{ \longrightarrow } C\quad 'C'\quad is\)

    (a)

    anilinium chloride

    (b)

    O – nitro aniline

    (c)

    benzene diazonium chloride

    (d)

    m– nitro benzoic acid

  17. Ozonolysis of terminal alkenes gives _________ as one of the products.

    (a)

    acetone

    (b)

    acetaldehyde

    (c)

    water

    (d)

    formaldehyde

  18. Which of the following compounds has the smell of bitter almonds?

    (a)

    aniline

    (b)

    nitro methane

    (c)

    benzene sulphonic acid

    (d)

    nitrobenzene

  19. Among the following L-serine is

    (a)

    (b)

    (c)

    (d)

  20. A dipeptide does not have

    (a)

    two peptide units

    (b)

    portions of two amino acids

    (c)

    an amino group

    (d)

    salt like structure

  21. The precipitation of protein is called_______

    (a)

    peptisation

    (b)

    denaturation

    (c)

    renaturation

    (d)

    none of these

  22. The polymer used in making blankets (artificial wool) is

    (a)

    polystyrene

    (b)

    PAN

    (c)

    polyester

    (d)

    polythene

  23. Nylon -66 is an example of ______ polymer.

    (a)

    addition

    (b)

    condensation

    (c)

    both (a) and (b)

    (d)

    natural

  24. The drug that binds to the receptor site and inhibits its natural function are called _______

    (a)

    anomers

    (b)

    agonists

    (c)

    antagonists

    (d)

    none of the above

  25. Potassium meta bisulphite is used as ________

    (a)

    food preservative

    (b)

    sweetening agent

    (c)

    a cosmetic

    (d)

    an antioxidant

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