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12th Standard English Medium Chemistry Reduced Syllabus Creative One mark Question with Answer key - 2021(Public Exam )

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50

    Part A

    50 x 1 = 50
  1. In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

    (a)

    Non-wettability of the mineral particles in froth.

    (b)

    Non-wettability of the mineral particles in water

    (c)

    Non-wettability of the gangue particles in froth

    (d)

    Non-wettability of the gangue particles in water

  2. Malachite has______ composition.

    (a)

    2CuCO3.Cu(OH)2

    (b)

    2CuCO3.Cu(OH)2

    (c)

    Cu2O

    (d)

    Cu2S

  3. Magnesite is_________

    (a)

    Magnesium oxide

    (b)

    Magnesium carbonate

    (c)

    Magnesium sulphate

    (d)

    Magnesium chloride

  4. In the thermite proces__________is used as a reducing agent

    (a)

    AI

    (b)

    CO

    (c)

    C

    (d)

    CO2

  5. Graphite has

    (a)

    2-d sheet structure

    (b)

    Vander waals force between successive layers of carbon sheets

    (c)

    Sp2 hybridised carbon linked with other three carbon atoms in hexagonal planar structure

    (d)

    all the above

  6. Elements of group 13 mainly form covalent compounds because ______

    (a)

    small size

    (b)

    electro negativity values are high

    (c)

    ionization energy is very high

    (d)

    both (a) and (c)

  7. Which of the following halides of group 15 is not hydrolysed?

    (a)

    NF3

    (b)

    PF3

    (c)

    NI3

    (d)

    Both (a) and (b)

  8. Least volatile hydrogen halide is

    (a)

    HF

    (b)

    HCI

    (c)

    HBr

    (d)

    HI

  9. Strong reducing behaviour of H3PO2 is due to______

    (a)

    High oxidation state of phosphorus

    (b)

    High electro gain enthalpy of phosphorus

    (c)

    Presence of two-OH groups and one P-H bond

    (d)

    Presence of one-OH groups and two P-H bonds

  10. Most of the transition metal ions are coloured, because of the

    (a)

    presence of unpaired electrons

    (b)

    energy gap between two energy levels is very small

    (c)

    both (a) and (b)

    (d)

    neither (a) nor (b)

  11. Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because

    (a)

    Ce4+ and Yb2+acquire f7 configuration

    (b)

    Ce4+ and Yb2+ acquire f0 configuration

    (c)

    Ce4+ and Yb2+acquire fand f14 configuration

    (d)

    Ce4+and Yb2+ acquire f0 and f14 configuration

  12. Identify the correct reason for lanthanide contraction

    (a)

    Decreasing nuclear charge

    (b)

    Decreasing screening effect

    (c)

    Increasing nuclear charge

    (d)

    Negligible screening effect

  13. ________ has the highest electrical conductivity at room temperature.

    (a)

    Chromium

    (b)

    Copper

    (c)

    Silver

    (d)

    Cadmium

  14. Primary and secondary valencies of Cu in [Cu(NH3)4]SO4 is

    (a)

    4,4

    (b)

    2,4

    (c)

    4,1

    (d)

    4,2

  15. Among the following complexes the one which shows zero crystal field stabilisation energy is

    (a)

    [Mn(H2O)6]3+

    (b)

    [Fe(H2O)6]3+

    (c)

    [CO(H2O)6]2+

    (d)

    [CO(H2O)6]3+

  16. The name of [PtIV(NH3)2CI2]2+is

    (a)

    Diamminedichloroplatinum(IV) ion

    (b)

    Diamminedichloroplatinate (IV)

    (c)

    Diamminedichloroplatinum

    (d)

    Dichlorodiammineplatinum (IV) ion

  17. The isomerism exhibited by the complexes [Co(NH3)6] [Cr(CN)6] and [Cr(NH3)8] [CO(CN)6] is_________

    (a)

    Geometrical

    (b)

    Coordination

    (c)

    linkage

    (d)

    ionisation

  18. A Cobaltous complex [Co(H2O)6]3+absorbs orange light of 5900 \(\mathring { A } \). The colour of the complex is __________

    (a)

    orange

    (b)

    yellow orange

    (c)

    blue

    (d)

    yellow

  19. In which of the following arrangements, octahedral voids are formed?

    (a)

    fcc

    (b)

    bcc

    (c)

    simple cubic

    (d)

    hcp

  20. Which of the following statement is correct?

    (a)

    On increasing temperature, the coordination number of solid remains unchanged.

    (b)

    On increasing pressure, the co-ordination number of solid increases.

    (c)

    On increasing pressure, the co-ordination number of solid decreases.

    (d)

    On increasing temperature, the coordination number of solid increases

  21. Pick out the example for covalent and molecular crystal.

    (a)

    Ice,Diamond

    (b)

    Diamond,Ice

    (c)

    NaCl, FeS

    (d)

    FeS,Ice

  22. The number of chloride ions present per unit of CsCI are

    (a)

    6

    (b)

    8

    (c)

    1

    (d)

    4

  23. In pseudo-order reactions

    (a)

    The actual order of reaction is different from that expected using rate law expression

    (b)

    The concentration of at least one reactant is taken in large excess.

    (c)

    The concentration of reactant taken in excess may be taken as constant

    (d)

    All of these

  24. In the graph showing Maxwell, Boltzmann distribution of energy _______________

    (a)

    area under the curve must not change with increase in temperature.

    (b)

    area under the curve increases in temperature.

    (c)

    area under the curve decreases with increase in temperature.

    (d)

    None of these above

  25. A device in which spontaneous chemical reaction generates electric current.

    (a)

    Galvanic cell

    (b)

    Voltaic cell

    (c)

    Daniel cell

    (d)

    All the above

  26. The zinc - copper cell has emf of ________

    (a)

    1V

    (b)

    2.1 V

    (c)

    1.1V

    (d)

    -1.1 V

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

    (a)

    CH3COOC2H5

    (b)

    H2O

    (c)

    CH3COOH

    (d)

    C2H5OH

  28. Emulsion can be broken into constituent liquids by

    (a)

    heating

    (b)

    freezing

    (c)

    centrifuging

    (d)

    all the above

  29. The property of the colloid which is independent on the charge of colloidal particle is______

    (a)

    cataphoresis

    (b)

    electrophoresis

    (c)

    electro- osmosis

    (d)

    Tyndalleffec

  30. Which among the following reagent is not used to differentiate ethanol and phenol?

    (a)

    neutral FeCl3

    (b)

    C6H5N2CI

    (c)

    NaOH

    (d)

    anhy ZnCl2

  31. The compound that reacts faster with Lucas reagent is ________

    (a)

    butan-l-ol

    (b)

    butan-2-ol

    (c)

    2-methyl propan-1-o1

    (d)

    2-methyl propan-2-o1

  32. 1 - methoxy propane and 2 - methoxy propane are ________

    (a)

    chain isomers

    (b)

    position isomers

    (c)

    metamers

    (d)

    functional isomers

  33. Which among the carbonyl compounds cannot be prepared by Rosenmund reduction?

    (a)

    Ketones

    (b)

    Formaldehyde

    (c)

    Acetaldehyde

    (d)

    Both (a) and (b)

  34. Calcium acetate + calcium benzoate \(\overset { distillation }{ \longrightarrow } \) gives

    (a)

    benzophenone

    (b)

    benzaldehyde

    (c)

    acetophenone

    (d)

    phenyl benzoate

  35. The pink colour of Schiff's reagent is restored by

    (a)

    alcohol

    (b)

    acid

    (c)

    ketone

    (d)

    aldehyde

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

    (a)

    acetone

    (b)

    acetaldehyde

    (c)

    water

    (d)

    formaldehyde

  37. Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and cone.HCI. This is__________ reaction.

    (a)

    Clemmenson's reduction

    (b)

    Wolff krishner reduction

    (c)

    Rosenmmunds reduction

    (d)

    catalytic reduction

  38. Which among the following reactions will give a secondary amine?

    (a)

    \({ CH }_{ 3 }CO{ NH }_{ 2 }\underrightarrow { { Br }_{ 2 }/KOH } \)

    (b)

    \({ CH }_{ 3 }{ CONH }_{ 3 }\underrightarrow { { LIAlH }_{ 4 } } \)

    (c)

    \({ CH }_{ 3 }CN\xrightarrow [ Na/{ C }_{ 2 }{ H }_{ 5 }OH ]{ } \)

    (d)

    \({ CH }_{ 3 }NC\underrightarrow { { LiAlH }_{ 4 } } \)

  39. The IUPAC name of the compound
    \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }-{ NO }_{ 2 }\)

    (a)

    1-nitro propane

    (b)

    1-nitro2-methyl propane

    (c)

    1-nito-2, 2-dimethyl propane

    (d)

    2-nitro-2-methyl propane

  40. Nitro-acinitro tautomerism is exhibited by ____________

    (a)

    nitromethane

    (b)

    nitrobenzene

    (c)

    chloropicrin

    (d)

    o-toluidine

  41. A dipeptide does not have

    (a)

    two peptide units

    (b)

    portions of two amino acids

    (c)

    an amino group

    (d)

    salt like structure

  42. Carbohydrates are

    (a)

    polyhydroxy aldehydes

    (b)

    polyhydroxy ketones

    (c)

    polyhydroxy acids

    (d)

    both (a) and (b)

  43. When cellulose is boiled with dilute H2SO4 it gives

    (a)

    D-glucose

    (b)

    D-fructose

    (c)

    Dextrine

    (d)

    Starch

  44. Pyridoxine is__________

    (a)

    vitamin B6

    (b)

    vitamin B7

    (c)

    vitamin B9

    (d)

    vitamin B5

  45. Oxidation of gluconic acid with nitric acid gives__________

    (a)

    saccharicacid

    (b)

    CO2 and water

    (c)

    acetic acid

    (d)

    maltose

  46. The helical structure of protein is stabilised by_________

    (a)

    peptide bonds

    (b)

    disulphide bonds

    (c)

    hydrogen bonds

    (d)

    Vanderwaals inter action

  47. Which among the following is a modification of penicillin?

    (a)

    amoxicillin

    (b)

    catecholamine

    (c)

    Crythromycin

    (d)

    all the above

  48. Pick out the wrong statement among the following.

    (a)

    Antipyretics is used to reduce the body temperature

    (b)

    Analgesics are drugs used to relieve pain

    (c)

    Milk of magnesia is used to relieve symptoms of heat burn

    (d)

    Tetracyclines are antifertility drugs

  49. Cellulose is an example of _____ polymer.

    (a)

    synthetic

    (b)

    Natural

    (c)

    semisynthetic

    (d)

    none of the above

  50. Sorbitol and Mannitol are ________

    (a)

    isomers

    (b)

    polymers

    (c)

    epimers

    (d)

    dimers

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