Define ,'Toxic'.
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Toxic is nothing at all.

Toxic is a harmful chemical substances which degrades the quality of pure substance .

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa