Chemistry: Ultimate MCQ Quiz!

17 Questions | Total Attempts: 399

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Chemistry: Ultimate MCQ Quiz!

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Questions and Answers
  • 1. 
    If the density of oil is 0.823 g/cm3 at 25 c, the volume(m3) of 3.62 g of oil (use significant figure) 
    • A. 

      4.4*10^-6

    • B. 

      8.3*10^-6

    • C. 

      8.30*10^-6

    • D. 

      4.40*10^-6

  • 2. 
    A mixture containing only (NaCl and SiO2) the mass of SiO2 in the mixture is two times the mass of NaCl, the % mass of SiO2
    • A. 

      33%

    • B. 

      25%

    • C. 

      75%

    • D. 

      67%

  • 3. 
    Which of the following statement is true 1.in the reaction of bleach solution with KI solution, I am the oxidizing agent 2.glass cleaner is the diluted solution of ammonia 3.the litmus paper changes from blue to red in drain paper solution 4.density decrease with increasing of temperature
    • A. 

      1,4

    • B. 

      2,3

    • C. 

      1,3

    • D. 

      2,4

  • 4. 
    A mixture containing (0.3g Sio2,30% NaCl ) and an unknown amount of NH4Cl ,when this mixture is heated it mass was decreased to 1.5g ,the mass of mixture is
    • A. 

      5.7

    • B. 

      7.3

    • C. 

      4.0

    • D. 

      9.0

  • 5. 
    Co2 gas could evolve through the addition of?
    • A. 

      Drain opener to hot water

    • B. 

      Bathroom cleaner to limestone

    • C. 

      Strong base to fertilizer 

    • D. 

      Bathroom cleaner to table salt

  • 6. 
    The active chemical gradieant in glass cleaner.
    • A. 

      NaHCO3

    • B. 

      HCl

    • C. 

      NH3

    • D. 

      NaCl

  • 7. 
    NH3gas could be described as:
    • A. 

      Colorless,orderless and acid

    • B. 

      Colorless,pungent and acid

    • C. 

      Colorless,pungent and base

    • D. 

      Colorless orderless and base

  • 8. 
    The missing reagent in the following equation Ba(OH)2+ X ------>Y + H2O
    • A. 

      OH- ,CO2

    • B. 

      CO2 , BaCO3

    • C. 

      H+ , CO2

    • D. 

      CO2 ,OH-

  • 9. 
    When 16 g of unknown solute added to 200g of water, the freezing point for this solution decreased by 6 C below the freezing point of water (Kf for water =1.86 C ) the molar mass of solute is:
    • A. 

      37.8

    • B. 

      11.6

    • C. 

      74.4

    • D. 

      24.8

  • 10. 
    Which of the following glass could be used for centrifuging?
    • A. 

      Test tube

    • B. 

      Evaporating dish

    • C. 

      Buchner funnel

    • D. 

      Graduated cylinder

  • 11. 
    Calculate the freezing point of 65%(wt/wt) ethylene glycol solution (M.M = 62g/mol) for water Kf =1.86 C Tf= 0C
    • A. 

      16.2 C

    • B. 

      -16.2 C

    • C. 

      55.7 C

    • D. 

      -55.7 C

  • 12. 
    Which one of the following instruments is used in the lab to get rid of pungent order?
    • A. 

      Oven

    • B. 

      Fume-hood

    • C. 

      Balance

    • D. 

      Fire extingnisher

  • 13. 
    As the mass of the solute added to solution decrease:
    • A. 

      Freezing point will decrease 

    • B. 

      Boiling point will decrease 

    • C. 

      Vapor pressure will decrease 

    • D. 

      Osmotic pressure will increase

  • 14. 
    Drain opener is:
    • A. 

      NH4+

    • B. 

      NAOH/Al

    • C. 

      NH3

    • D. 

      CaCO3

  • 15. 
    Which of the following contain 5 significant figures?
    • A. 

      0.004520

    • B. 

      0.0045210

    • C. 

      0.00452

    • D. 

      0.00450201

  • 16. 
    Which of the following solution would be expected to have the lowest freezing point?
    • A. 

      3.5 g of glycerin in 30 ml of water

    • B. 

      4.0 g of glycerin in 30 ml of water

    • C. 

      6.0 g of glycerine in 30 ml of water

    • D. 

      2.0g of glycerin in 30 mo of water

  • 17. 
    Which of the following would be used to separate SiO2 from a heterogeneous mixture of SiO2 and water?
    • A. 

      Sublimation

    • B. 

      Filteration

    • C. 

      Extraction

    • D. 

      Heating

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