Hydrogen can be fused to form helium at

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(A) . $A$ fusion reaction is difficult to occur because positively charged nuclei repel each other.At very high temperatures of the order of $10^6$ to

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High temperature and high pressure

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(A) . $A$ fusion reaction is difficult to occur because positively charged nuclei repel each other.At very high temperatures of the order of $10^6$ to $10^7 \ K$,the nuclei may have sufficient energy to overcome the repulsive forces and fuse.It is for this reason,fusion reactions are also called thermonuclear reactions.Hence,hydrogen can be fused to form helium at high temperature and high pressure.

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