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M n_{2} O_{7}, C O_{2}, C r O_{3}, C r_{2} O_{3}, V_{2} O_{5} a n d V_{2} O_{4}

M_{2} O_{7}, C r_{2} O_{3} a n d V_{2} O_{5}

V_{2} O_{5} a n d V_{2} O_{4}

C r O_{3}, C r_{2} O_{3}, V_{2} O_{5} a n d V_{2} O_{4}

C r_{2} O_{3} a n d V_{2} O_{5}

M n_{2} O_{7}, C r_{2} O_{3}, C r O_{3,} V_{2} O_{5} a n d V_{2} O_{4}

ANS : 4

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