NCERT Class XI Chemistry Redox Reactions Solutions
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Question : 1
Total: 30
Assign oxidation number to the underlined elements in each of the following species :
(a)N a H 2
O 4
(b)N a H
O 4
(c)H 4
O 7
(d)K 2
O 4
(e)C a
(f)N a
H 4
(g)H 2
O 7
(h)K A l (
O 4 ) 2 · 12 H 2 O
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
Solution:
Let the oxidation no. of underlined element in all the given compounds = x
(a)
Since the sum of oxidation number of various atoms inN a H 2 P O 4
1(+1) + 2(+1) + (x) + 4(–2) = 0 or x = +5
Thus, the oxidation number of P inN a H 2 P O 4
(b) In
S
Thus, the oxidation number of S inN a H S O 4
(c) In
Thus, the oxidation number of P inH 4 P 2 O 7
(d) In
Thus, the oxidation number of Mn inK 2 M n O 4
(e) In
Thus, the oxidation number of oxygen inC a O 2
(f) InN a B H 4
In
Thus, the oxidation number of B inN a B H 4
(g) In
Thus, the oxidation number of S inH 2 S 2 O 7
(h) In
(
) 2 . 12 H 2 O
Thus, the oxidation number of S inK A l ( S O 4 ) 2. 12 H 2 O
(a)
Since the sum of oxidation number of various atoms in
1(+1) + 2(+1) + (x) + 4(–2) = 0 or x = +5
Thus, the oxidation number of P in
(b) In
Thus, the oxidation number of S in
(c) In
Thus, the oxidation number of P in
(d) In
Thus, the oxidation number of Mn in
(e) In
Thus, the oxidation number of oxygen in
(f) In
In
Thus, the oxidation number of B in
(g) In
Thus, the oxidation number of S in
(h) In
Thus, the oxidation number of S in
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