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

ହେକ୍ସେନର ସୂତ୍ରରେ କେତୋଟି ହାଇଡ୍ରୋଜେନ୍ ପରମାଣୁ ଉପସ୍ଥିତ?

1

14

2

12

3

10

4

16

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