IUPAC name of Na3[Co(NO2)6] is
sodium hexanitrito cobaltate (II)
sodium hexanitro cobaltate (III)
sodium hexanitrito cobaltate (III)
sodium cobaltnitrite
Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of
S and Cl
N and S
N
S
During the extraction of gold the following reactions take place
Au + CN- + H2O [X]
[X] + Zn → [Y] + Au
X and Y are respectively
[Au(CN)2]- and [Zn(CN)6]4-
[Au(CN)4]2- and [Zn(CN)4]2-
[Au(CN)4]3- and [Zn(CN)4]2-
[Au(CN)2]- and [Zn(CN4)]2-
D.
[Au(CN)2]- and [Zn(CN4)]2-
X and Y are [Au(CN)2]- and [Zn(CN4)]2-.
4Au + 8CN- + 2H2O + O2 → 4[Au(CN)2]- + 4OH-
2[Au(CN)2]- + Zn → 2Au (s) ↓ + [Zn(CN)4]2-
The number of gram molecules of chlorine in 6.02 × 1025 hydrogen chloride molecules is
10
100
50
5
When a sulphur sol is evaporated sulphur is obtained. On mixing with water sulphur sol is not formed. The sol is
lyophilic
reversible
hydrophobic
hydrophilic
When conc. H2SO4 is heated with P2O5, the acid is converted into
sulphur trioxide
sulphur dioxide
sulphur
a mixture of sulphur dioxie and sulphur trioxide
The noble gas mixture is cooled in a coconut bulb at 173 K. The gases that are not adsorbed are
Ne and Xe
He and Xe
Ar and Kr
He and Ne