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

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. Duralumin is an alloy of

    (a)

    Cu,Mn

    (b)

    Cu,Al,Mg

    (c)

    Al,Mn

    (d)

    Al,Cu,Mn,Mg

  3. Which of the following compounds is colourless?

    (a)

    Fe3+

    (b)

    Ti4+

    (c)

    Co2+

    (d)

    Ni2+

  4. Formula of tris(ethane-1,2-diamine)iron(II)phosphate

    (a)

    [Fe(CH3-CH(NH2)2)3](PO4)3

    (b)

    [Fe(H2N-CH-CH2-NH2)3](PO4)

    (c)

    [Fe(H2N-CH2-CH2-NH2)3](PO4)2

    (d)

    [Fe(H2N-CH2-CH2-NH2-NH2)3]3(PO4)2

  5. if ‘a’ is the length of the side of the cube, the distance between the body centered atom and one corner atom in the cube will be

    (a)

    \(\left( \cfrac { 2 }{ \sqrt { 3 } } \right) a\)

    (b)

    \(\left( \cfrac { 4 }{ \sqrt { 3 } } \right) a\)

    (c)

    \(\left( \cfrac { \sqrt { 3 } }{ 4 } \right) a\)

    (d)

    \(\left( \cfrac { \sqrt { 3 } }{ 2 } \right) a\)

  6. If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is

    (a)

    Zero

    (b)

    one

    (c)

    Fraction

    (d)

    none

  7. Electrolyte KCl KNO3 HCl NaOAC NaCl
    Λ-
    (Scm2 mol-1)
    149.9 145.0 426.2 91.0 126.5

    Calculate ΛoHoAC using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25oC.

    (a)

    517.2

    (b)

    552.7

    (c)

    390.7

    (d)

    217.5

  8. _________is an exampleofO/W type emulsion.

    (a)

    butter

    (b)

    cream

    (c)

    milk

    (d)

    curd

  9. The function of FeCl3 in the conversion of Fe(OH)3 precipitate into a colloid is_________

    (a)

    peptising agent

    (b)

    emulsifying agent

    (c)

    reducing agent

    (d)

    precipitating agent


  10. The above reaction is called

    (a)

    Gattermann reaction

    (b)

    Williamson ether synthesis

    (c)

    Swern's reaction

    (d)

    Riemer tiemann reaction

  11. p-Nitrophenol is having lower pKa value than phenol because

    (a)

    phenol is more acidic than p-nitro phenol

    (b)

    anion of P-nitro phenol is more stabilised by resonance than that of phenol.

    (c)

    degree of ionisation of p-nitro phenol is less than that of phenol

    (d)

    anion of p-nitro phenol is less stable than that of phenol.

  12. Alcohols are isomeric with

    (a)

    aldehyde

    (b)

    ketones

    (c)

    ethers

    (d)

    esters

  13. Which of the following has an offensive odour?

    (a)

    Phenol

    (b)

    Benzy lalcohol

    (c)

    Acrolein

    (d)

    Benzyl benzoate

  14. The major product obtained when phenol is treated with sodium hydroxide and carbon di oxide is _________

    (a)

    Salicyaldehyde

    (b)

    Salicylic acid

    (c)

    benzaldehyde

    (d)

    benzoic acid

  15. Among the following compounds strongest acid is _________

    (a)

    HC≡CH

    (b)

    C6H6

    (c)

    C2H6

    (d)

    CH3OH

  16. A compound 'X' when mixed with ethanol and a drop of concentrated H2SO4 gave a compound with fruity odour. Identify 'X'.

    (a)

    HCHO

    (b)

    CH3OH

    (c)

    CH3COOH

    (d)

    CH3NH2

  17. Acetone reacting with HCN to form cyanohydrin is ________ type of reaction.

    (a)

    Nucleophilicaddition

    (b)

    Electrophilic substitution

    (c)

    Freeradical substitution

    (d)

    Redox

  18. On fusion with KOH benzophenone undergoes __________, and gives potassium benzoate and ________.

    (a)

    disproportionation reaction, toluene

    (b)

    condensation reaction, toluene

    (c)

    disproportionation reaction, benzene

    (d)

    condensation reaction, benzene

  19. \({ CH }_{ 3 }{ CH }_{ 2 }OH\overset { { K }_{ 2 }{ C }3_{ 3 }{ O }_{ 7 }/{ H }^{ + } }{ \longrightarrow } \underline { 'X' } +{ H }_{ 2 }O'X'\) is _______.

    (a)

    CH3CHO

    (b)

    CH3COCH3

    (c)

    CH3COOCH3

    (d)

    CH3CN

  20. Which among the following will from significant amount of meta isomer on nitration?

    (a)

    (b)

    (c)

    (d)

  21. C6H5CHO + Methylamine ⟶ X Y + H2SO4-p pamino benzene sulphonic acid.
    Then X and Y are

    (a)

    Schiff's Base, C6H5NH2

    (b)

    C6H6, C6H5CHO

    (c)

    benzal- N - methyl amine, Toluene

    (d)

    None of these

  22. The compound which gives an oily nitrosoamine on reaction with nitrous acid at low temperature is ____________

    (a)

    C2H5NH2

    (b)

    (CH3)2NH

    (c)

    (CH3)3N

    (d)

    (CH3)2CHNH2

  23. The tertiary nitro compound is ___________

    (a)

    2-nitropropane

    (b)

    1-nitropropane

    (c)

    1-nitro-2, 2-dimethyl propane

    (d)

    2-nitro-2-methyl propane

  24. Sucrose on hydrolysis gives

    (a)

    maltose

    (b)

    glucose and fructose

    (c)

    2 molecules of maltose

    (d)

    starch

  25. Name the sugar present in RNA.

    (a)

    D-ribose

    (b)

    2'-deoxy -D-ribose

    (c)

    D-raffinose

    (d)

    D-glucose

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