" /> -->

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

12th Standard EM

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

Chemistry

Time : 00:25:00 Hrs
Total Marks : 25
    Answer all the questions
    25 x 1 = 25
  1. Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)

    (a)

    Distillation

    (b)

    Zone refining

    (c)

    Displacement with zinc

    (d)

    liquation

  2. Which one is correct statement for zeolite?

    (a)

    Zeolites are aluminosilicates having three dimensional framework

    (b)

    Hydrate zeolites are used as ion exchangers in hardening of soft water

    (c)

    Zeolites are alumino silicates

    (d)

    all the above

  3. If'a' is the length of unit cell, then which one is correct relationship?

    (a)

    For simple cubic lattice, radius of metal atom=\(\frac{a}{2}\)

    (b)

    For bee lattice, radius of metal atom \(=\frac { \sqrt { 3a } }{ 4 } \)

    (c)

    For fcc lattice, radius of metal atom \(=\frac { a }{ 2\sqrt { 2 } } \)

    (d)

    All of these

  4. Assertion: rate of reaction doubles when the concentration of the reactant is doubles if it is a first order reaction.
    Reason: rate constant also doubles

    (a)

    Both assertion and reason are true and reason is the correct explanation of assertion.

    (b)

    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.

  5. What would be the activation energy of a reaction when the temperature is increased from 27oC to 37oC?

    (a)

    534 kJ mol-1

    (b)

    53.4 kJ mol-1

    (c)

    5.34 kJ mol-1

    (d)

    None of these

  6. Buffer index is

    (a)

    \(\beta =\frac { dB }{ p{ K }_{ a } } \)

    (b)

    \(\beta =\frac { dB }{ d(pH) } \)

    (c)

    \(\beta =\frac { dB }{ pH } \)

    (d)

    \(\beta =\frac { dB }{ pOH } \)

  7. Fog is a colloidal solution of

    (a)

    gas in liquid

    (b)

    liquid in gas

    (c)

    gas in solid

    (d)

    solid in gas

  8. Ethylene diamine is converted to ethylene glycol using

    (a)

    Na2CO3 solution

    (b)

    Nitrous acid

    (c)

    NaHCO3 (aqueous)

    (d)

    Baeyer's reagent

  9. It has no α- hydrogen

    (a)

    CH3CH2OH

    (b)

    CH3- CH2- CH2- OH

    (c)

    \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -OH\)

    (d)

  10. \({ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y\quad 'Y'\) is

    (a)

    Formaldelyde

    (b)

    diacetoneammonia

    (c)

    hexamethylenetetraamine

    (d)

    oxime

  11. Identify the product formed in the reaction 

    (a)

    (b)

    (c)

    (d)

  12. Identify 'X'.

    (a)

    (b)

    (c)

    (d)

  13. On dry distillation this gives acetophenone.

    (a)

    calcium benzoate

    (b)

    calcium acetate and calcium benzoate

    (c)

    calcium acetate

    (d)

    calcium acetate and calcium formate

  14. In metal carbonyls, the oxidation state of the metal is _________.

    (a)

    0

    (b)

    +2

    (c)

    +4

    (d)

    +6

  15. CH3CH2 Br \(\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D'D'is\)

    (a)

    bromomethane

    (b)

    \(\alpha\)-bromo sodium acetate

    (c)

    methanamine

    (d)

    acetamide

  16. Denaturation does not involve

    (a)

    breaking up ofH-bonding in proteins

    (b)

    the loss of biological action of enzyme

    (c)

    the loss of secondary structure

    (d)

    loss of primary structure of proteins

  17. ________is called animal starch.

    (a)

    cellulose

    (b)

    heparin

    (c)

    glycogen

    (d)

    hyaluronic acid

  18. The number of asymmetric carbon atoms present in glucose is__________.

    (a)

    3

    (b)

    4

    (c)

    5

    (d)

    6

  19. Sorbitol and Mannitol are________

    (a)

    isomers

    (b)

    polymers

    (c)

    polymers

    (d)

    dimers

  20. Mental diseases like schizophrenia are treated using _______ drugs.

    (a)

    tranquilizers

    (b)

    antacid

    (c)

    opioids

    (d)

    NSAID

  21. The free radical polymerisation of the monomer 2 - chloro buta - l,3-diene gives

    (a)

    Buna N

    (b)

    Buna S

    (c)

    Neoprene

    (d)

    PHB

  22. Proteins which act as biological catalysts are called ________

    (a)

    enzymes

    (b)

    hormones

    (c)

    vitamins

    (d)

    polymers

  23. ______ drugs are used in birth control pills.

    (a)

    Antihistamine

    (b)

    fertility

    (c)

    Antifertility

    (d)

    aminoglycosides

  24. Which of the following is not an anesthetics?

    (a)

    nitrous oxide

    (b)

    chloroform

    (c)

    ether

    (d)

    novalgin

  25. Nylon 6, 6 is a _______

    (a)

    polyester

    (b)

    polyamide

    (c)

    formaldehyde resin

    (d)

    polyalkene

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

TN 12th Standard EM Chemistry free Online practice tests

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

Write your Comment