Which of the following factor may be reg...

Which of the following factor may be regarded as the main cause of lanthanide contration ?

A

Poor shielding of one of the 4f electrons .

B

Effective shielding of one of the 4f electrons by another in the sub shell

C

Poor shielding of 5d electron by 4f electrons

D

Greater shielding of 5d electrons by 4f electrons.

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Knowledge Check

The main cause of lanthanide-contraction is

A

poor shielding of one of the 4f -eIectrons by another in the subshell

B

greater shielding of 5d electrons by 4f electrons

C

poorer shielding of 5d electrons by 4f electrons

D

effective shielding of one of the 4f electrons by another in the subshell

Which of the following is a lanthanide ?

A

Ta

B

Rh

C

Th

D

Lu

Which of the following statements regarding copper salte is not true :

A

Copprer (I) disproportionates into Cu and Cu (II) in aqueous solution

B

Copper (I) can be stabilised by the formation of insoluble complex compound such as `CuCl_2^-` and `Cu(CN)_2^-`

C

Copper (II) oxide is red powder

D

Hydratd `CuSO_4` is `[Cu(H_2O)_4]SO_4H_2O`

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