химия 201-300

Specify the formula of the exhausted slake

• Ca(OH)₂

• CaO

• NaCl

• CaH₂

• CaCO₃

Number of the electrons in atom of sulphur is equal to

• 16

• 32

• 6

• 18

• 10

Specify the number of electrons sodium

• 11

• 8

• 2

• 10

• 14

The charge of a proton is equal

• +

• 0

• -

• 1,6

• 6,02×10²³

Specify calcium orthophosphate

• Ca₃(PO₄)₂

• Ca(PO₄)₂

• Ca₃(PO₄)

• Ca(PO₄)

• Ca₃PO₄

Constant of Avogadro () units of measurement is equal to

• mole^-1

• g/mole

• g/mole

• l

• kg/mole

With what substance CaO is cooperates

• H₂SO₄

• Na₂O

• Ca

• KOH

• K

What a degree oxidation of zinc in the zincate ion

• +2

• -2

• +1

• -4

• +3

What element forms amphoterous oxides

• Al

• Na

• Ca

• Mg

• Ba

Specify the aqua complex connections

• [Al(H₂O)₆]Cl₃

• [LiAlH₄]

• Na₂[Be(OH)₄]

• [Ag(NH₃)₃Cl]Cl

• [Pt(NH₃)₃Cl₃]Cl