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प्रश्न
_______ and ______ are the two gases, which when taken together, make up about 99 percentage of air.
- Nitrogen
- carbon-di-oxide
- Noble gases
- Oxygen
विकल्प
I and II
I and III
II and IV
I and IV
उत्तर
I and IV are the two gases, which when taken together, make up about 99 percentage of air.
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