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Question : 22
Total: 30
How would you account for the following?
(i) Transition metals exhibit variable oxidation states.
(ii)Z r ( Z = 40 ) H f ( Z = 72 )
(iii) Transition metals and their compounds act as catalyst.
OR
Complete the following chemical equations:
(i)C r 2 O 7 2 − + 6 F e 2 + + 14 H + →
(ii)2 C r O 4 2 − + 2 H + →
(iii)2 M n O 4 − + 5 C 2 O 4 2 − + 16 H + →
(i) Transition metals exhibit variable oxidation states.
(ii)
(iii) Transition metals and their compounds act as catalyst.
OR
Complete the following chemical equations:
(i)
(ii)
(iii)
Solution:
(i) C r 2 O 7 2 − + 6 F e 2 + + 14 H + → 6 F e 3 + + 2 C r 3 + + 7 H 2 O
(ii)2 C r O 4 2 − + 2 H + → C r 2 O 7 2 − + H 2 O
(iii)2 M n O 4 − + 5 C 2 O 4 2 − + 16 H + → 2 M n 2 + + 10 C O 2 + 8 H 2 O
OR
(i) Transition metals shows variable oxidation state because they have tendency to loose electron from their penultimated
(ii)Z r H f 4 f
(iii)4 d
N 2 + 3 H 2
2 N H 3
(ii)
(iii)
OR
(i) Transition metals shows variable oxidation state because they have tendency to loose electron from their penultimate
(ii)
(iii)
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