" /> -->

12th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions with Answer Key 2020

12th Standard EM

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

Chemistry

Time : 00:25:00 Hrs
Total Marks : 25
    Answer all the questions
    25 x 1 = 25
  1. The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively

    (a)

    acidic, acidic, basic

    (b)

    basic, acidic, basic

    (c)

    basic, neutral, basic

    (d)

    none of these

  2. With regard to the strength of acids and bases, Find the incorrect statement among the following.

    (a)

    Strong acid is one that completely dissociates in water

    (b)

    Ka is the dissociation constant

    (c)

    CH3COOH is a weak acid

    (d)

    Smaller the Ka value, greater is the acid strength

  3. The conjugate base of NH-2 is

    (a)

    NH-

    (b)

    NH3

    (c)

    NH+3

    (d)

    NH2-

  4. How many faradays of electricity are required for the following reaction to occur
    MnO→ Mn 4-

    (a)

    5F

    (b)

    3F

    (c)

    1F

    (d)

    7F

  5. Using the data given below fmd out the strongest reducing agent
    \({ E }_{ { Cr }_{ 2 }{ O }_{ 7 }^{ 2- } }^{ o }{ Cr }^{ 3+ }=1.33V{ ,E }_{ { Cl }_{ 2 }{ / }{ Cl }^{ - } }^{ o }=1.36V\)
    \({ E }_{ { Mn }O_{ 4 }^{ - } }^{ 0 }/{ Mn }^{ 2+ }=1.51V,{ E }_{ { Cr }^{ 3+ }/Cr }^{ o }=-0.74V\)

    (a)

    Cr

    (b)

    Cr3+

    (c)

    Cl-

    (d)

    Mn2+

  6. Statement :
    To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?

    (a)

    It is not true, ferric chloride is a poison.

    (b)

    It is true, Fe3+ ions coagulate blood which is a negatively charged sol

    (c)

    It is not true; ferric chloride is ionic and gets into the blood stream.

    (d)

    It is true, coagulation takes place because of formation of negatively charged sol with Cl-.

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

    (a)

    CH3COOC2H5

    (b)

    H2O

    (c)

    CH3COOH

    (d)

    C2H5OH

  8. Silica gel is utilised for the ________of the number of gases.

    (a)

    adsorption

    (b)

    absorption

    (c)

    desorption

    (d)

    all of these

  9. In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol . A and X respectively are

    (a)

    Chloroethane and NaOH

    (b)

    ethanol and H2SO4

    (c)

    2 – chloroethan -1-ol and NaHCO3

    (d)

    ethanol and H2O

  10. Which among the following sets of reactants will produce anisole?

    (a)

    HCHO, RMgX

    (b)

    (c)

    C6H5ONa, CH3Br

    (d)

    C6H5CH3, CH3CoCI

  11. The general formula for aliphatic ether is ________

    (a)

    CnH2n+2O

    (b)

    CnH2nO

    (c)

    CnH2n-2O

    (d)

    C2nH2n+1O

  12. Phenol is used to manufacture _________

    (a)

    plastics and drugs

    (b)

    explosivesand pesticides

    (c)

    antiseptics and germicides

    (d)

    all the above

  13. 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

  14. In Friedel Craft's reaction of benzoylation of benzene, which of the following acts as a electrophile?

    (a)

    CHCO+

    (b)

    CHO-

    (c)

    CH3CO+

    (d)

    CH3CO-

  15. The organic compound whose balling point is 452K and has the smell of bitter almond is _________.

    (a)

    HCHO

    (b)

    CH3CHO

    (c)

    C6H5CHO

    (d)

    C6H5CH2CHO

  16. 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

  17. C6H5NH\(\underrightarrow { { NANO }_{ 2 }/HCl } \)  X Identify X.

    (a)

    C6H5CI

    (b)

    C6H5NHOH

    (c)

    C6H5N2CI

    (d)

    C6H5OH

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

    (a)

    DNA

    (b)

    Enzymes

    (c)

    Harmones

    (d)

    Vitamins

  19. Raffinose on hydrolysis gives

    (a)

    two monosaccharides

    (b)

    three monosaccharides

    (c)

    one disaccharide and one monosaccharide

    (d)

    two monosaccharides and one disaccharide

  20. Starch contains 20% of _________and 80% of______.

    (a)

    ribulose, amylose

    (b)

    mylopectin, amylose

    (c)

    amylose, amylopectin

    (d)

    amylopectin, ribulose

  21. The number of optical isomers depend on________.

    (a)

    number of chiral carbon

    (b)

    number of carbon present

    (c)

    number of oxygen present

    (d)

    both (b) and (c)

  22. Ribose is_________

    (a)

    Ketopentose

    (b)

    Ketotetrose

    (c)

    Aldotriose

    (d)

    Aldopentose

  23. In acidic solution an amino acid, when placed in an electric field__________

    (a)

    moves towards cathode

    (b)

    moves towards the anode

    (c)

    dissociates to cation and anion

    (d)

    does not move either towards the cathode or anode

  24. Which one of the following structures represents nylon 6,6 polymer?

    (a)

    (b)

    (c)

    (d)

  25. Aspirin is _______

    (a)

    benzoyl salicylic acid

    (b)

    acetyl salicylic acid

    (c)

    methyl salicylic

    (d)

    both (b) and (c)

*****************************************

TN 12th Standard EM Chemistry free Online practice tests

Reviews & Comments about 12th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions with Answer Key 2020

Write your Comment