Which of the following does not exist?
KI + I2 → KI3
KF + F2 → KF3
KBr + ICI2 → K[BrICl]
KF + BrF3 → K[BrF4]
Which of the following does not represent the correct order of the property indicated?
Sc3+ > Cr3+ > Fe3+ >Mn3+ - ionic radii
Sc < Ti < Cr < Mn - density
Mn2+ >Ni2+ > Co2+ <Fe2+ - ionic radii
FeO < CaO < MnO < CuO - basic nature
7.5% Ag and 92.5% Cu
92.5% Ag and 7.5% Cu
80% Ag and 20% Cu
90% Ag and 10% Cu
Assertion (A): Cu2+ and Cd2+ are separated by first adding KCN solution and then passing H-S gas.
Reason (R): KCN reduces Cu2+ to Cu+ and forms a complex with it.
The correct answer is
Both (A) and (R) are true and (R) is the correct explanation of (A)
Both (A) and (R) are true but (R) is not the correct explanation of (A)
(A) is true but (R) is not true
(A) is not true but (R) is true
B.
Both (A) and (R) are true but (R) is not the correct explanation of (A)
KCN forms complex with Cu+ and Cd2+ as K3[Cu(CN)4] and K2[Cd(CN)4] respectively. On passing H2S only Cd2+ complex gets decomposed to yellow CdS.
The correct formula of the complex tetraammineaquachlorocobalt (III) chloride is
[Cl(H2O)(NH3)4Co]Cl
[CoCl(H2O)(NH3)4]Cl
[Co(NH3)4(H2O)Cl]Cl
[CoCl(H2O)(NH3)4]Cl2
Across the lanthanide series, the basicity of the lanthanide hydroxides
increases
decreases
first increases and then decreases
first decreases and then increases