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പീരിയൊഡിക് ടേബിൾ
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Mn2O7 ൽ ന്റെ Mn ഓക്സീകരണവസ്തു എത്ര ?
A
+4
B
+6
C
+3
D
+7
Answer:
D. +7
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iii) Calcium is the eighth element after Beryllium.
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