Hey there:
Correct answer is :
(b) NaNH₂
Sodium azanide NaNH₂ is the conjugate base of ammonia NH₃
Correct answer is :
(b) NaNH₂
I hope this will help !
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The answer for this question is: Atoms
The simple machine used is called atwood machine.
Cellar respiration simple if u need explanation just search up