Which of the following chlorine oxoacids is the strongest?

HClO

HClO2

HClO3

HClO4

With the same central atom, acid strength increases as the number of oxygens attached to it increases, so perchloric acid (HClO4) is the strongest.

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What is the effect of nicotinic acid on human organism?

it is neutral

It is harmful, causes cancer

It is highly toxic, kills in 10 seconds

It is essential for functioning

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What will happen if you mix glycerol with potassium permanganate?

nothing

it will emit a very strong odor

the flame will appear

potassium permanganate will change its colour