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'X' is the number of acidic oxides among VO 2 , V 2 O 3 , CrO 3 , V 2 O 5 and Mn 2 O 7 . The primary valency of cobalt in [CO(H 2 NCH 2 CH 2 NH 2 ) 3 ] 2 (SO 4 ) 3 is Y. The value of X + Y is ______.

1. 4
2. 3
3. 2
4. 5

Correct answer: 5

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