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Acids and Bases
Questionarium
 

 

    1. In the reaction NH3 (aq) + H2O (l) <---> NH4+ (aq) + OH- (aq), the conjugate acid to the base NH3 is:
 
NH4+      H2O      OH-

 

    2. The pH of an aqueous solution is defined as:
 

pH = - log [OH-]      pH = - log [H+]      pH = ln [H+]

 

    3. An acid aqueous solution has:
 

pH < 7      pH = 7      pH > 7

 

    4. From the following groups which has only acids:
 

HCl, HNO3, NH3, H2SO4
H2SO4,NaOH, KOH, HCl
H2SO4, HClO4, HCl, HNO3

 

    5. An anfoteric compound is:
 

an acid and has two H+ ions to react with bases.
a compound that can acts as acid or base.
a base and has two OH- ions to react with acids.

 

    6. According to the Bronsted theory, a compound that works as a base has the ability to:
 

accept protons.
accept electrons.
not accept or donate electrons.

 

    7. According to the Lewis theory, a compound that works as a base has the ability to:
 

accept or donate one pair of electrons.
accept one pair of electrons.
donate one pair of electrons.

 

    8. A polytropic acid has:
 

more than one hydroxide atoms.
more than one acidic hydrogen atoms.
the ability to be both acid and base.

 
Time:



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