химия 101-200

Specify ortoborate ion

• BO ₃^3-

• BO ^3-

• H BO^2-₃

• HB^-

• B^2-

Define a degree of oxidation of sulfur in sulfide aluminium

• -2

• +2

• +6

• +4

• -4

Specify oxidation degree of hydrogen

• ±1

• +1

• -1

• 2

• 1

Specify correct name of the substance Na2HPO4

• Sodium dihydroorthophosphate

• Sodium monohydro orthophosphate

• Potassium dihydro orthophosphate

• Sodium dihydro orthophosphite

• Sodium dihydro orthophosphide

How many atom mass of carbon?

• 12

• 10

• 15

• 25

• 11

Number of protons in atom of nucleus of magnesium is equal to:

• 12

• 24

• 6

• 14

• 11

Specify a molecule ammonia

• H₃N

• NH₃

• O₂

• N₂

• HCl

How many electron of hydrogen

• 1

• 3

• 1

• 5

• 10

Specify the name of the salt - FeOHCO₃

• iron (ІІІ) monohydroxocarbonate

• hydrocarbonate Fe

• carbonate Fe(ІІ)

• carbonate Fe (ІІІ)

• carbide Fe

Specify electron an of potassium

• 19

• 19

• 20

• 43

• 15