Which one of the following is a pure substance consisting of two or more different types of elements chemically combined together in a fix ratio by mass?
مندرجہ ذیل میں سے کون سا ایک خالص مادہ ہے جس میں دو یا دو سے زیادہ مختلف قسم کے عناصر پر مشتمل ہے جو بڑے پیمانے پر فکس تناسب میں کیمیائی طور پر ایک ساتھ مل کر ہوتا ہے؟
Answer: Compound
Explanation
A compound is a pure substance formed when two or more different elements chemically combine in a fixed ratio.
Examples include water (H₂O) and carbon dioxide (CO₂).
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