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Drag the proper word to finish the task nanomaterials' drawbacks in chemistry:
 
Answer variants:
disposal
reactive
oxygen
easy
challenge
biologically
impurities
Nanoparticles
exothermic
hydrogen
  • are uncertain when they react with
    .
  • Their
     combustion with oxygen can readily make an explosion.
  • Because nanoparticles are very
    , they naturally combine with
    as well.
  • Nanomaterials are
     harmful and toxic.
  • It is a
     to synthesise, isolate and apply them.
  • There are no hard-and-fast safe
     policies for nanomaterials.