Which of the following is not a rule for...

Which of the following is not a rule for calculating oxidation number ?

For ions, oxidation number is equal to the charge on the ion.

The oxidation number of oxygen is -2 in all of its compounds.

The oxidation number of fluorine is -1 in all of its compounds.

Oxidation number of hydrogen is +1 except in binary hydrides of alkali metals and alkaline earth metals where it is -1.

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To determine which of the following statements is not a rule for calculating oxidation numbers, we will analyze each option provided. ### Step-by-Step Solution: 1. **Understand the Rules for Oxidation Numbers**: - The oxidation number of an element in a compound can be determined by a set of established rules. 2. **Evaluate Each Option**: - **Option 1**: "For ions, the oxidation number is equal to the charge of the ion." - This statement is **correct**. The oxidation number of a monatomic ion is indeed equal to its charge. - **Option 2**: "The oxidation number of oxygen is -2 in all of its compounds." - This statement is **incorrect**. While oxygen typically has an oxidation number of -2, in peroxides (like H2O2), it has an oxidation number of -1, and in superoxides, it has an oxidation number of -1/2. - **Option 3**: "The oxidation number of fluorine is -1 in all its compounds." - This statement is **correct**. Fluorine is the most electronegative element and always has an oxidation number of -1 in its compounds. - **Option 4**: "The oxidation number of hydrogen is +1 except in binary hydrides of alkali metals and alkaline earth metals." - This statement is **correct**. Hydrogen typically has an oxidation number of +1, but in hydrides of alkali metals (like NaH) and alkaline earth metals (like CaH2), it has an oxidation number of -1. 3. **Conclusion**: - The only statement that is not a rule for calculating oxidation numbers is **Option 2**: "The oxidation number of oxygen is -2 in all of its compounds." ### Final Answer: The statement that is not a rule for calculating oxidation numbers is **Option 2**. ---

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Which of the following arrangements represent increaseing oxidation number of the central atom?

`CrO_(2)^(-),ClO_(3)^(-),CrO_(4)^(2-),MnO_(4)^(-)`

`ClO_(3)^(-),CrO_(4)^(2-),MnO_(4)^(-),CrO_(2)^(-)`

`CrO_(2)^(-),ClO_(3)^(-),MNO_(4)^(-),CrO_(4)^(2-)`

`CrO_(4)^(2-),MnO_(4)^(-),CrO_(2)^(-),ClO_(3)^(-)`

Which of the following arrangements represent increasingg oxidation number of the central atom?

`CrO_(2)^(-),ClO_(3)^(-),CrO_(4)^(2-),MnO_(4)^(-)`

`ClO_(3)^(-),CrO_(4)^(2-),MnO_(4)^(-),CrO_(2)^(-)`

`CrO_(2)^(-),ClO_(3)^(-),MnO_(4)^(-),CrO_(4)^(2-)`

`CrO_(4)^(2-),MnO_(4)^(-),CrO_(2)^(-),ClO_(3)^(-)`

Which of the following rules is not related to weight' training?

Concentrating on the muscles during exercise.

Maintaining a good rhythm during exercise.

Resting between the sets for 30 to 60 seconds.

Not warming up and stretching before the workouts.