Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 General Science Chemistry Basic Concepts of Chemistry

Cr2O72- में, प्रत्येक Cr से जुड़ा हुआ है

1
दो O परमाणु
2
तीन O परमाणु
3
चार O परमाणु
4
पांच O परमाणु
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