CBSE chemistry
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Zn2+ salts are white while Cu2+ salts are coloured. Why?
|
Element/Ion |
Electronic Configuration |
|
Zn |
3d10 4s2 |
|
Zn2+ |
3d10 |
|
Cu |
3d10 4s1 |
|
Cu2+ |
3d9 |
The colours of salts of transition metals are due to the d-d transition that depends on the presence of incompletely filled d-orbitals. Zn2+ has completely filled d-orbitals (3d10), while Cu2+ has incompletely filled d-orbitals (3d9); therefore, d-d transition is possible in Cu2+, which imparts colour to copper (II) salts.
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How much charge is required for the reduction of 1 mol of Zn2+ to Zn?
Zn2+ + 2e- ---> Zn
Number of electrons involved = 2
Charge required for the reduction of Zn2+ = 2F
We know
1F = 96,487 C
Thus,
2F = 2 x 96487 = 1,92,974 C
Write the dispersed phase and dispersion medium of butter.
In colloidal dispersion, one substance is dispersed as very fine particles in another substance called dispersion medium. In the case of dust, solid particles are dispersed in air as the dispersion medium.
Dispersed phase: Liquid
Dispersion medium: Solid
Write the structures of the following molecules:
(i) H2SO3
(ii) XeOF4
|
|
Molecules |
Structures |
|
(i) |
H2SO3 |
 |
|
(ii) |
XeOF4 |
|
Write down the IUPAC name of the complex [Pt(en)2Cl2]2+. What type of isomerism is shown by this complex?
Complex: [Pt(en)2Cl2]2+
IUPAC name: Dichloridobis(ethane-1,2-diammine)platinum(IV) ion
Isomerism: Geometrical isomerism
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Mock Test Series
Mock Test Series