Oxidation Number and Rules for Assigning Oxidation Numbers
Chemistry ⇒ Redox Reactions and Electrochemistry
Oxidation Number and Rules for Assigning Oxidation Numbers starts at 10 and continues till grade 12.
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See sample questions for grade 11
Assign the oxidation number to each element in NH4Cl.
Explain the steps to assign oxidation numbers to atoms in a polyatomic ion.
Explain why the oxidation number of hydrogen is -1 in metal hydrides.
State the oxidation number of each element in H2SO3.
State the oxidation number of each element in Na2SO4.
In which of the following does oxygen have a positive oxidation number?
(1) H2O
(2) OF2
(3) CO2
(4) SO2
Which element can have variable oxidation numbers in its compounds?
(1) Sodium
(2) Oxygen
(3) Iron
(4) Fluorine
Which of the following elements always has an oxidation number of zero in its elemental form?
(1) Oxygen
(2) Chlorine
(3) Sodium
(4) All of the above
Which of the following has the highest oxidation number for sulfur?
(1) SO2
(2) SO3
(3) H2S
(4) S2Cl2
Fill in the blank: The oxidation number of fluorine in all its compounds is ______.
Fill in the blank: The oxidation number of potassium in K2O is ______.
The oxidation number of hydrogen is usually ______, except when bonded to metals in hydrides.
State True or False: In peroxides, the oxidation number of oxygen is -2.
True or False: The oxidation number of alkali metals in their compounds is always +1.
True or False: The oxidation number of an atom in a monoatomic ion is equal to the charge of the ion.
True or False: The sum of the oxidation numbers in a neutral compound is always zero.
