Question

Выберите ряд, где все вещества электролиты:1) HNO3, СuO, BaCO3, NaOH2) H2SO3, спирт, CaSO4, Mg(OH)23) H2CO3, крахмал, Cu(OH)2 CaCO34) HI, KOH, Ca(NO3)2, HCl

Answer 1

ЭТО 4 РЯД: Hl, KOH, Ca(NO₃)₂, HCl

Answer 2

The correct answer is option 4: HI, KOH, Ca(NO3)2, HCl.

An electrolyte is a substance that conducts electricity when dissolved in water or melted. It dissociates into ions, which are charged particles that carry the electric current. Let's analyze each option to determine which one contains only electrolytes:

1) HNO3, CuO, BaCO3, NaOH: - HNO3 (nitric acid) is an electrolyte because it dissociates into H+ and NO3- ions when dissolved in water [[1]]. - CuO (copper(II) oxide) and BaCO3 (barium carbonate) are not electrolytes because they do not dissociate into ions when dissolved in water. - NaOH (sodium hydroxide) is an electrolyte because it dissociates into Na+ and OH- ions when dissolved in water [[2]].

2) H2SO3, alcohol, CaSO4, Mg(OH)2: - H2SO3 (sulfurous acid) is a weak electrolyte because it partially dissociates into H+ and HSO3- ions when dissolved in water [[3]]. - Alcohol is not an electrolyte because it does not dissociate into ions when dissolved in water. - CaSO4 (calcium sulfate) and Mg(OH)2 (magnesium hydroxide) are not electrolytes because they do not dissociate into ions when dissolved in water.

3) H2CO3, starch, Cu(OH)2, CaCO3: - H2CO3 (carbonic acid) is a weak electrolyte because it partially dissociates into H+ and HCO3- ions when dissolved in water [[4]]. - Starch is not an electrolyte because it does not dissociate into ions when dissolved in water. - Cu(OH)2 (copper(II) hydroxide) and CaCO3 (calcium carbonate) are not electrolytes because they do not dissociate into ions when dissolved in water.

4) HI, KOH, Ca(NO3)2, HCl: - HI (hydroiodic acid), KOH (potassium hydroxide), Ca(NO3)2 (calcium nitrate), and HCl (hydrochloric acid) are all electrolytes because they dissociate into ions when dissolved in water [[5]].

Therefore, the correct answer is option 4: HI, KOH, Ca(NO3)2, HCl.