NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions
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Question : 26
Total: 49
Indicate the steps in the preparation of
(i)K 2 C r 2 O 7
(ii)K M n O 4
(i)
(ii)
Solution:
(i) 4 F e C r 2 O 4 + 8 N a 2 C O 3 + 7 O 2 → 8 N a 2 C r O 4 + 2 F e 2 O 3 + 8 C O 2
(ii)2 M n O 2 + 4 K O H + O 2
2 K 2 M n O 4 + 2 H 2 O
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