Question

Name a fuel used in nuclear reactor?

Answer 1

Mostly Uranium-235 and plutonium-239

but sometimes mixture of uranium,plutonium..

Answer 2

Nuclear fuel - MOX. Mixed oxide, or MOX fuel, is a blend of plutonium and natural or depleted uranium which behaves similarly (though not identically) to the enriched uranium feed for which most nuclear reactors were designed.
make this answer BRAINLIEST if it helps.
Thanks