Which statement best describes the pH of pure water? It is neutral because the concentration of hydronium ions equals that of hydroxide ions. It is neutral because the pure liquid contains neither hydronium ions nor hydroxide ions. It is acidic because it has a hydronium ion concentration of mc027-1. Jpg. It is basic because it has a hydroxide ion concentration of mc027-2. Jpg.

Water is neutral because there is an equal concentration of hydronium ions and hydroxide ions.

Explanation:

Water autoionizes into equal parts hydronium and hydroxide ions, resulting in a neutral pH. This is because during the autoionization reaction, two water molecules yield one hydronium and one hydroxide.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.