لاب كيمياء فاينل #فارمسجي

20 Questions | Total Attempts: 101

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Questions and Answers
  • 1. 
    Which of the following is valid rate for reaction below?  2A + 3B ----> 1/2 C + 2D
    • A. 

      1/2 Δ[A]/Δt

    • B. 

      -Δ[A]/Δt = Δ[D]/Δt

    • C. 

      2 Δ[D]/Δt

    • D. 

      1/3Δ[B]/Δt

  • 2. 
    A 0.4123 g sample of unknown dioprotic acid (H2A) require 55.0 ml of 0.4 M NaOH to reach the end point the molar mass of this acid is :  H2A + 2NaOH --> Na2A +2H2O
    • A. 

      45.8

    • B. 

      37.5

    • C. 

      34.4

    • D. 

      41.2

  • 3. 
    If the density of 6.75 g unknown metal is 8.6 g/cm3 at 25 Cَ  the volume of metal in dm3 is 
    • A. 

      7.8 x10-4

    • B. 

      570

    • C. 

      5.7 x10-4

    • D. 

      780

  • 4. 
    Pb+2 ions form white ppt with HCl 
    • A. 

      True

    • B. 

      False

  • 5. 
    A 44 g of unknown solute was added to 250 g of pure water , the freezing point was decreased to 35 cَ if Kf = 1.86 C/m then the molar mass of the solute is 
    • A. 

      99

    • B. 

      84

    • C. 

      94

    • D. 

      89

  • 6. 
    If 50 ml of 1.5 M NaOH was neutralized with 50 ml at 1.6 M HCl at 22.3 cَ  after neutraliztion the tempreture at the solution increase to 30 cَ  if the dinsity and the specific heat of the solution are 1.10 g/ml and 4.05 g/m/cَ respectivity , the heat of neutralization in Kj/mol is :
    • A. 

      34.3

    • B. 

      45.7

    • C. 

      74.7

    • D. 

      63.6

  • 7. 
    The method used to separate pbCl2form mixture of AgCland Hg2Cl2 after added hot water to the mixture is 
    • A. 

      Filtration

    • B. 

      Sublimation

    • C. 

      Distillation 

    • D. 

      Cenrifugation

  • 8. 
    A + B+-----> (A+)   + B
    • A. 

      A is oxidizing agent and B+ is reducing agent 

    • B. 

      A is reducing agent and B+ is oxidizing agent

    • C. 

      B is reducing agent and A+is oxidizing agent 

    • D. 

      A+is reducing agent and B is oxidizing agent

  • 9. 
    How many moles of Oxgyen gas would be needed to Completly react with 5 moles of 41 ? 4Al + 3O2 -----> 2Al2o3
    • A. 

      2.5

    • B. 

      6.66

    • C. 

      3.75

    • D. 

      3.6

  • 10. 
    THe rate Constant for a chemical reaction decrease with decrease of tempreture 
    • A. 

      True

    • B. 

      False

  • 11. 
    The addition of bathroom cleaner to Limeston produces ...... gas? 
    • A. 

      HCl

    • B. 

      CO2

    • C. 

      H2

    • D. 

      NH3

  • 12. 
    A heat release by which one of the following pocess is known as heat of solution 
    • A. 

      Flow when NaOH dissolved in water 

    • B. 

      Evolved at constant pressure when HCl is nutralized with NaOH

    • C. 

      Evolved when sulid NaOH is reacted with Aqueous solion HCl 

    • D. 

      Evolved when distilled water is added to Aqueous solution at NaOH

  • 13. 
    How many gram of KHp(MM=204.2 g/mol) should be dissolve in Enough water to neutralize 22 ml of 0.15 M NaOH sodum
    • A. 

      0.4 g 

    • B. 

      0.9 g 

    • C. 

      0.67 g 

    • D. 

      1.51 g

  • 14. 
    The color of pbCro4 ppt is :
    • A. 

      Yellow

    • B. 

      Colorless

    • C. 

      White

    • D. 

      Black

  • 15. 
      [ClO2] [OH-] m/s 1 0.06 0.03 0.0248 2 0.02 0.03 0.00276 3 0.02 0.09 0.00828  the date in the table were Obtained for the reaction 2 ClO2 + 2 OH- ------->ClO2-   + H2O What is the Overall order of the reaction :
    • A. 

      4

    • B. 

      0

    • C. 

      1

    • D. 

      3

  • 16. 
    Reduction is losing of electron and increase in oxidation number
    • A. 

      True

    • B. 

      False

  • 17. 
    Which of the following action may be occurred 1)Zn + CuSO4 ---->                2)Cu +ZnSO4 ----> 3Zn  + 2 HCl ------>                 4)Cu + 2HCl ----->
    • A. 

      1,3

    • B. 

      2,4

    • C. 

      1,4

    • D. 

      2,3

  • 18. 
    Alll acid-base reaction (neutralization) are always endothermic 
    • A. 

      True

    • B. 

      False

  • 19. 
    The color Phenophtaliene indicator is 
    • A. 

      Pink in NaOH solution 

    • B. 

      Pink in HCl solution 

    • C. 

      Pink in H2SO4 solution 

    • D. 

      Yellow in HCl

  • 20. 
    Which of the following statements are false ? 1)the order of reaction is equal to the coefficent of reaction in balanced chemical equetion 2) the overall order of reaction could be equal zero 3)the order to the reaction is always integar number and positive value
    • A. 

      1,2

    • B. 

      1,3

    • C. 

      All of it 

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