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The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?
- a)The algebraic sum of all the oxidation numbers in a compound is zero.
- b)In all its compounds, the oxidation number of fluorine is – 1.
- c)An element in the free or the uncombined state bears oxidation number zero.
- d)The oxidation number of hydrogen is always +1.
Correct answer is option 'D'. Can you explain this answer?
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The oxidation number of an element in a compound is evaluated on the b...
as oxygen is more electronegative than Cl,Br and I. So they have positive oxidation state.
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The oxidation number of an element in a compound is evaluated on the b...
Explanation:
Oxidation number or state is a concept used to describe the degree of oxidation (loss of electrons) of an atom in a compound. The oxidation number of an element in a compound is evaluated on the basis of certain rules. Let's discuss each rule one by one and find out which one is not correct.
a) The algebraic sum of all the oxidation numbers in a compound is zero: This rule is correct. The sum of oxidation numbers of all the atoms in a neutral compound is always zero. For example, in H2O, the oxidation number of hydrogen is +1 and the oxidation number of oxygen is -2. So, the sum of oxidation numbers is (2*+1) + (-2) = 0.
b) In all its compounds, the oxidation number of fluorine is 1: This rule is not correct. The oxidation number of fluorine in its compounds is always -1, except in a few highly electronegative compounds where it exhibits positive oxidation states. For example, in HF, the oxidation number of fluorine is -1, while in OF2, the oxidation number of fluorine is +2.
c) An element in the free or the uncombined state bears oxidation number zero: This rule is correct. The elements in their elemental form have zero oxidation state. For example, the oxidation state of oxygen in O2 is zero and the oxidation state of iron in Fe is also zero.
d) The oxidation number of hydrogen is always 1: This rule is not correct. The oxidation number of hydrogen can vary from -1 to +1, depending on the compound it is present in. For example, in H2O, the oxidation number of hydrogen is +1, while in NaH, the oxidation number of hydrogen is -1.
Therefore, the correct answer is option D.
Oxidation number or state is a concept used to describe the degree of oxidation (loss of electrons) of an atom in a compound. The oxidation number of an element in a compound is evaluated on the basis of certain rules. Let's discuss each rule one by one and find out which one is not correct.
a) The algebraic sum of all the oxidation numbers in a compound is zero: This rule is correct. The sum of oxidation numbers of all the atoms in a neutral compound is always zero. For example, in H2O, the oxidation number of hydrogen is +1 and the oxidation number of oxygen is -2. So, the sum of oxidation numbers is (2*+1) + (-2) = 0.
b) In all its compounds, the oxidation number of fluorine is 1: This rule is not correct. The oxidation number of fluorine in its compounds is always -1, except in a few highly electronegative compounds where it exhibits positive oxidation states. For example, in HF, the oxidation number of fluorine is -1, while in OF2, the oxidation number of fluorine is +2.
c) An element in the free or the uncombined state bears oxidation number zero: This rule is correct. The elements in their elemental form have zero oxidation state. For example, the oxidation state of oxygen in O2 is zero and the oxidation state of iron in Fe is also zero.
d) The oxidation number of hydrogen is always 1: This rule is not correct. The oxidation number of hydrogen can vary from -1 to +1, depending on the compound it is present in. For example, in H2O, the oxidation number of hydrogen is +1, while in NaH, the oxidation number of hydrogen is -1.
Therefore, the correct answer is option D.
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The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer? for Class 11 2026 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 11 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer?.
The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer? for Class 11 2026 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 11 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer?.
Solutions for The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 11. Download more important topics, notes, lectures and mock test series for Class 11 Exam by signing up for free.
Here you can find the meaning of The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer?, a detailed solution for The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?a)The algebraic sum of all the oxidation numbers in a compound is zero.b)In all its compounds, the oxidation number of fluorine is – 1.c)An element in the free or the uncombined state bears oxidation number zero.d)The oxidation number of hydrogen is always +1.Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice Class 11 tests.
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