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कोई भी पदार्थ जो स्वयं को परिवर्तित किए बिना रासायनिक अभिक्रिया की दर को प्रभावित करने में समर्थ हो, उसे कहा जाता है :

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कोई भी पदार्थ जो स्वयं को परिवर्तित किए बिना रासायनिक अभिक्रिया की दर को प्रभावित करने में समर्थ हो, उसे कहा जाता है :






 
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