Teaching Bihar Sakshamta Pariksha (Niyojit Shikshak) Mock Test 2024 General Knowledge Ecology and Environment Environmental pollution

पेयजल में सर्वाधिक आर्सेनिक प्रदूषण वाला शहर कौन-सा है?

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कानपुर
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चेन्नई
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दिल्ली
4
कोलकाता
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