A Quick Chemistry Quiz!

9 Questions | Total Attempts: 82

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Chemistry Quizzes & Trivia

Questions and Answers
  • 1. 
    Which of the following arrangement is true according to decreasing in melting point
    • A. 

      NaCl>NH4Cl>SiO2

    • B. 

      SiO2>NaCl>NH4Cl

    • C. 

      SiO2>NH4Cl>NaCl

    • D. 

      NH4Cl>SiO2>NaCl

  • 2. 
    Which one of the following is the method used to separate NH4Cl from mixture containing (NH4Cl,,SiO2,,NaCl)?
    • A. 

      Filteration 

    • B. 

      Extraction

    • C. 

      Heat (sublimation)

    • D. 

      1+2

  • 3. 
    Which one of the following precaution is NOT true ?
    • A. 

      Wear a lab coat 

    • B. 

      Always pour water into acid , not acid into water 

    • C. 

      Clean up all broken glass ware  immeditly 

    • D. 

      Dont perform any unauthorized expirement 

  • 4. 
    The correct measured volume in graduted cylinder with a precision of (+_ 0.05 Cm3) is 
    • A. 

      7 Cm3

    • B. 

      7.06 Cm3

    • C. 

      2.3 Cm3

    • D. 

      1.0003 Cm3

  • 5. 
    Collegative properities of solution include all of the following except :
    • A. 

      Boiling point elevation 

    • B. 

      Vapor pressure lowering

    • C. 

      Equilibrium constant depression 

    • D. 

      Freezing point depression 

  • 6. 
    Baking soda contain :
    • A. 

      HCl

    • B. 

      NaOH/Al

    • C. 

      NH4+

    • D. 

      NaHCO3

  • 7. 
    Mixture containing (NaCl,SiO2,NH4Cl,), NaCl = 35% , when the mixture heated it mass decreased to (0.97 g ) the remaining was dissolved in water ,the solid was filtered and its mass  was (0.27 g), what is the mass of NH4Cl in water ?  
    • A. 

      0.85 g

    • B. 

      2.53 g

    • C. 

      1.3 g 

    • D. 

      1.45 g

  • 8. 
    The freezing point of a solution made by dissolved 14 g unkown in 200 g of water (k= 1.86 c0/m, Tf = 0 c0) decreased by 3 c0 ... the molar mass of unkown is :
    • A. 

      26 g/mol

    • B. 

      32.6 g/mol

    • C. 

      43.4 g/mol 

    • D. 

      62 g/ mol

  • 9. 
    A mixture weighing (3.9 g) contains BaCL3.2H2o ( 244.2 g/mol ) and Na3Po4.12H2o (380.2 g/ mol ), when this mixture dissolved in water and heated for a time (0.45 g) of BaCl3.(PO4)2 is ( 602.2 g/ mol ) producrd , if BaCl3.2H2O is the limiting reactant , how many grams of Na3PO4.12H2O unreacted in the mixture ?
    • A. 

      2.5 g 

    • B. 

      3.1 g 

    • C. 

      1.98 g 

    • D. 

      2.79 g

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