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ইউনিভার্সেল ইন্ডিকেটর কি?

Md. Saifur Rahman

বিভিন্ন এসিড-ক্ষার নির্দেশকের (দুর্বল জৈব এসিড কিংবা ক্ষার মিশ্রণ হলো ইউনিভার্সাল ইন্ডিকেটর।

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