Question

В каждом ряду выберете неверную формулу и объясните ответ 1. NaOH, KOH, Fe(OH)2, LiOH 2. H2SO2, HCL, H2CO3, H2S 3. CO2, Na2O, P2O3, SO2 4. NaCL, Na2SO4, Na2CO3, Na2SiO3

Answer 1

1. fe (oh) 2 
2. h2so2 
3/ p2o3 

Answer 2

1. NaOH, KOH, Fe(OH)2, LiOH

The incorrect formula in this row is "Fe(OH)2."

Explanation:

• NaOH: Sodium hydroxide is a strong base commonly known as caustic soda. Its chemical formula is NaOH.
• KOH: Potassium hydroxide is another strong base, and its chemical formula is KOH.
• LiOH: Lithium hydroxide is a base composed of lithium, and its chemical formula is LiOH.

However, "Fe(OH)2" is incorrect. The correct formula for iron(II) hydroxide is "Fe(OH)2." The correct formula for iron(II) hydroxide is "Fe(OH)2." It should be written as "Fe(OH)2." Iron(II) hydroxide is a precipitate formed when iron(II) ions react with hydroxide ions, but it is not a strong base like the other compounds listed in the row.

2. H2SO2, HCL, H2CO3, H2S

The incorrect formula in this row is "H2SO2."

Explanation:

• HCL: Hydrochloric acid is a strong acid with the chemical formula HCl.
• H2CO3: Carbonic acid is a weak acid formed when carbon dioxide dissolves in water, and its chemical formula is H2CO3.
• H2S: Hydrogen sulfide is a weak acid with the chemical formula H2S.

However, "H2SO2" is incorrect. The correct formula for sulfurous acid is "H2SO3." Sulfurous acid is a weak acid formed when sulfur dioxide dissolves in water. "H2SO2" is not a valid chemical formula.

3. CO2, Na2O, P2O3, SO2

The incorrect formula in this row is "Na2O."

Explanation:

• CO2: Carbon dioxide is a non-metallic oxide composed of carbon and oxygen with the chemical formula CO2.
• P2O3: Phosphorous trioxide is an oxide of phosphorus with the chemical formula P2O3.
• SO2: Sulfur dioxide is an oxide of sulfur with the chemical formula SO2.

However, "Na2O" is incorrect. The correct formula for sodium oxide is "Na2O." Sodium oxide is a compound composed of sodium and oxygen, but it is not a covalent oxide like the other compounds listed in the row.

4. NaCL, Na2SO4, Na2CO3, Na2SiO3

All the formulas in this row are correct. Each compound is a valid chemical formula representing different sodium compounds:

• NaCl: Sodium chloride is commonly known as table salt.
• Na2SO4: Sodium sulfate is a salt used in various industrial applications.
• Na2CO3: Sodium carbonate is used in manufacturing and as a water softener.
• Na2SiO3: Sodium silicate is used in various industrial processes and as a cleaning agent.

Therefore, there is no incorrect formula in this row.