Nascent hydrogen is prepared by
(A) Na and CX2HX5OH
(B) Al and NaOH
(C) Zn and dil. HX2SOX4
(D) All of these
My attempt
I know that option (A) & option (C) are correct option. But don't know about option (C) and in the answer all of them are correct.
Can someone provide the complete reaction about option (B) and its important information such as similar reactions or mechanism?
Answer
Zinc and sulfuric acid react to form nascent hydrogen. From chem-guide.blogspot.com (emphasis mine):
[…] if ordinary hydrogen is passed through acidified KMnOX4 it does not get decolourised. However, if zinc pieces are added to the same solution, bubbles of hydrogen rise up through the solution and the colour is discharged due to the reduction of KMnOX4 by nascent hydrogen.
KMnOX4+HX2molecular+HX2SOX4⟶No reactionZn+HX2SOX4⟶ZnSOX4+2Hnascent hydrogen|×52kMnOX4+HX2SOX4+10[H]⟶KX2SOX4+2MnSOX4+8HX2O5Zn+8HX2SOX4+2KMnOX4⟶5ZnSOX4(aq)+KX2SOX4+2MnSOX4+8HX2O
See this youtube video for more information.
As for the reaction given in option (B), see previous SE questions: this, this and this.
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