NCERT Class XI Chemistry Redox Reactions Solutions
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Question : 22
Total: 30
Consider the elements: Cs, Ne, I and F
(a) Identify the element that exhibits only negative oxidation state.
(b) Identify the element that exhibits only positive oxidation state.
(c) Identify the element that exhibits both positive and negative oxidation states.
(d) Identify the element which exhibits neither the negative nor does the positive oxidation state.
(a) Identify the element that exhibits only negative oxidation state.
(b) Identify the element that exhibits only positive oxidation state.
(c) Identify the element that exhibits both positive and negative oxidation states.
(d) Identify the element which exhibits neither the negative nor does the positive oxidation state.
Solution:
(a) F : Fluorine is the most electronegative element and shows only –1 oxidation state.
(b) Cs : Because of the presence of single electron in the valence shell, (alkali metals) Cs exhibits an oxidation state of +1 only.
(c) I : Because of the presence of seven electrons in the valence shell, I shows an oxidation state of –1 in compounds with more electropositive elements (such as H, Na, K, Ca, etc.) and oxidation states of +3, +5, +7 in compounds of I with more electronegative elements (such as, O, F, etc.)
(d) Ne : It is an inert gas (with high ionization enthalpy and highly positive electron gain enthalpy) and hence, it exhibits neither negative nor positive oxidation states.
(b) Cs : Because of the presence of single electron in the valence shell, (alkali metals) Cs exhibits an oxidation state of +1 only.
(c) I : Because of the presence of seven electrons in the valence shell, I shows an oxidation state of –1 in compounds with more electropositive elements (such as H, Na, K, Ca, etc.) and oxidation states of +3, +5, +7 in compounds of I with more electronegative elements (such as, O, F, etc.)
(d) Ne : It is an inert gas (with high ionization enthalpy and highly positive electron gain enthalpy) and hence, it exhibits neither negative nor positive oxidation states.
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