railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Periodic Table

संपीडित नैसर्गिक वायू (CNG) हा प्रामुख्याने कशाने बनलेला आहे?

1
मिथेन
2
प्रोपेन
3
इथेन
4
ब्यूटेन
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