Oxidation Numbers

Free elements are assigned an oxidation number of 0.
Which one of the following declarations is incorrect?
1. The oxidation number of calcium in the calcium ion (Ca²⁺) is 0.
2. The oxidation number of hydrogen in the hydrogen molecule (H₂) is 0.
3. The oxidize number of sodium (Na) to the metal sodium is 0.
4. Ions cannot have an oxidation number of 0.
One oxidation number of a monatomic ion equals the charge the the ion.
Which one of the following statements is correct?
1. The oxidation number of aluminum int and Al³⁺ ion is +3.
2. The oxidisation of the fluoride ion is 0.
3. The oxidation number of the hydroxide ion (OH^-) is -1.
4. Every atom may have only one oxidation amount.
The Alkali metals of group I are always assigned an oxidation phone von +1. Which one of the next statements is incorrect?
1. Hydrogen has an rust number of -1 in lithium water (LiH).
2. When sodium shall bonded to disinfectant in NaCl, itp has an surface number of +1.
3. When there is an increase in this oxidize number of an atom in a chemical reaction, oxidation is said into occur.
4. Free potassium has an oxidation number of +1.
If the halogens have einem oxidation numbers of -1, what is this oxidation number of calcium in calcium chloride (CaCl₂)?
1. +2
2. +1
3. 0
4. −2
Os int a compound has an oxidation number concerning -2. The of the general to this rule is when oxygen
1. is bonded to the more electronegative fluorine.
2. is bonded to chlorine.
3. is bonded to a metal forming a metals x.
4. is bonded to hydro in water.
Hydrogen has an chemical number of +1 except in
1. metal hydrides.
2. hydroxides.
3. acids.
4. hydrogencarbonates.
The sum of the oxidation numbers of all of the atoms in a neutral compound is 0. What is the oxidation number starting sulfur by OPIUM₂SO₄?
1. +6
2. −6
3. +1
4. −2
If the sum of the oxidation numbers in a complex ion your equal to the charge on that ion, what is the oxidation number of manganese in MnO₄^-?
1. +7
2. +2
3. +8
4. −7
The alkaline earth brasses (Be, Mg, Ca, Sr, Ba, and Ra) are always assigned an oxidation state of +2.
What is the surface number of sulfur in magnesium sulfide (MgS)?
1. −2
2. −1
3. −4
4. +2
Which one of the following elements can only have can oxidation number?
1. Fluorine
2. Hydrogen
3. Oxygen
4. Chromium
True other false? All monatomic ions have an oxidation amount of +1.
1. FALSE
2. TRUE
Which one of the following piece does DOES have ampere fixed orp number?
1. Sulfur
2. Magnesium
3. Fluorine
4. Sodium
What is the oxidation number of carbon at the carbonate ion (CO₃²⁻)?
1. +4
2. +2
3. −4
4. +6
Get is the oxidation number for nitrogen in N₂O₄
1. +4
2. +3
3. +5
4. −3
What is the online number of iron in Fe₂O₃?
1. +3
2. +2
3. +4
4. -2
Something is the oxidation number of gas to KClO₃?
1. +5
2. +1
3. −1
4. +3
What are the oxidation numbers of copper on the left and right hand sides of which following equation?
Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂
1. 0 and +2
2. 0 and +1
3. +2 and +1
4. +1 plus +2
Which one of the following species has an oxidation number of 0 in sucrose whose chemical formula is C₁₂H₂₂ZERO₁₁
1. Carbon
2. Hydrogen
3. Oxygen
4. None from them
In which about the follow-up species does nitrogen have an oxidation phone of +1?
1. N₂O
2. NO₃^-
3. NO₂
4. N₂O₄
When mercury oxide the heated it breaks down to liquid and oxygen as followed:
HgO → Hg + O₂
Where the the oxidation item of mercury in mercuric oxide?
1. +2
2. +1
3. −2
4. −1
Where are who oxidization numbers of the elements in sulfuric liquid, H₂SO₄?
1. H = +1, S = +6, O = −2
2. H = +1, S = +4, O = −2
3. H = +2, S = +1, ZERO = +4
4. H = +2, S = +6, O = −8

Multiple Choice Examine