Quiz  /  Water or Hydride of Oxygen Class 9 MCQ Questions With Answers

  • 1. 
    What is the name of H3PO4?

  • hydrophosphoric acid
  • phosphorous acid
  • phosphoric acid
  • phosphoric hydroxide

  • 2. 
    What is the pH of a solution if [H+] = 6.0 x 10-10 M?

  • 3.45
  • 6.25
  • 9.22
  • 11.34

  • 3. 
    What is the name of Mg(OH)2

  • magnesium hydroxide acid
  • hydromagnesium acid
  • magnesium oxygen hydride
  • magnesium hydroxide

  • 4. 
    Predict the products for the following reaction:LiOH + H2SO4 -->

  • LiSO4 + HOH
  • LiSO4 + H2(OH)
  • Li2SO4 + HOH
  • Li2SO4 + H2(OH)

  • 5. 
    What is the pH of a solution if [H+] = 1.0 x 10-5M?

  • 5.00
  • 7.00
  • 9.00
  • 11.00

  • 6. 
    If a 25 mL sample of HCl is neutralized by 21.3 mL of 0.78 M Mg(OH)2, what is the molarity of HCl? The balanced equation is:2HCl + Mg(OH)2 --> MgCl2 + 2HOH

  • 0.00033 M HCl
  • 0.0013 M HCl
  • 0.35 M HCl
  • 1.3 M HCl

  • 7. 
    What is the pH of a solution of 0.0050 mol of HBr in 2.500 L of water?

  • 1.35
  • 2.70
  • 5.68
  • 8.25

  • 8. 
    What is the [H+] of a solution if the pH = 5.60?

  • 1.25 x 10-3 M
  • 1.25 x 10-6 M
  • 2.51 x 10-3 M
  • 2.51 x 10-6 M

  • 9. 
    How many moles of potassium hydroxide are needed to completely neutralize 0.75 mol of phosphoric acid? The balanced equation is:H3PO4 + 3KOH --> K3PO4 + 3H2O

  • 0.75 mol
  • 2.25 mol
  • 0.25 mol
  • 0.375 mol

  • 10. 
    What is the formula of hydrosulfuric acid?

  • H2S
  • H2SO4
  • HS
  • HSO4

  • 11. 
    Which of the following is a property of bases?

  • a pH < 7
  • slippery feel
  • tart or sour taste
  • corrosive to metals

  • 12. 
    Which one of the following solutions is the most acidic?

  • [H+] = 2.4 x 10-6 M
  • [H+] = 9.8 x 10-4 M
  • [H+] = 4.2 x 10-7 M
  • [H+] = 1.7 x 10-12 M

  • 13. 
    Which of the following is a property of an acid?

  • pH > 7
  • turns litmus paper blue
  • tart or sour taste
  • corrosive to organic materials
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