A Quick Chemistry Quiz!

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  • 1/9 Questions

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

    • Filteration 
    • Extraction
    • Heat (sublimation)
    • 1+2
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  • 2. 

    Collegative properities of solution include all of the following except :

    • Boiling point elevation 

    • Vapor pressure lowering

    • Equilibrium constant depression 

    • Freezing point depression 

    Correct Answer
    A. Equilibrium constant depression 
  • 3. 

    Baking soda contain :

    • HCl

    • NaOH/Al

    • NH4+

    • NaHCO3

    Correct Answer
    A. NaHCO3
  • 4. 

    Which one of the following precaution is NOT true ?

    • Wear a lab coat 

    • Always pour water into acid , not acid into water 

    • Clean up all broken glass ware  immeditly 

    • Dont perform any unauthorized expirement 

    Correct Answer
    A. Always pour water into acid , not acid into water 
  • 5. 

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

    • 26 g/mol

    • 32.6 g/mol

    • 43.4 g/mol 

    • 62 g/ mol

    Correct Answer
    A. 43.4 g/mol 
  • 6. 

    Which of the following arrangement is true according to decreasing in melting point

    • NaCl>NH4Cl>SiO2

    • SiO2>NaCl>NH4Cl

    • SiO2>NH4Cl>NaCl

    • NH4Cl>SiO2>NaCl

    Correct Answer
    A. SiO2>NaCl>NH4Cl
  • 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 ?  

    • 0.85 g

    • 2.53 g

    • 1.3 g 

    • 1.45 g

    Correct Answer
    A. 1.3 g 
  • 8. 

    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 ?

    • 2.5 g 

    • 3.1 g 

    • 1.98 g 

    • 2.79 g

    Correct Answer
    A. 2.79 g
  • 9. 

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

    • 7 Cm3

    • 7.06 Cm3

    • 2.3 Cm3

    • 1.0003 Cm3

    Correct Answer
    A. 2.3 Cm3

Quiz Review Timeline (Updated): Mar 20, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 18, 2019
    Quiz Created by
    Pharmacgy
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