General Knowledge · Chemistry
गुलदाउदी (क्रिसैंथिमम) के फूलों से प्राप्त होने वाला कौन सा रासायनिक पदार्थ व्यापक रूप से मच्छर प्रतिकर्षी के रूप में उपयोग किया जाता है?
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