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#1 2017-10-18 04:26:19
- shakeel123
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This Gas is used for respiration?
9th Class Karachi Board Exams Quizzes MCQs Quizzes Karachi Board 9th Class Chemistry Online Test 1
Question:
This Gas is used for respiration?
Option A):
Nitrogen
Option B):
Hydrogen
Option C):
Chlorine
Option D):
Oxygen
Correct Answer is Option D):
Oxygen
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