Mock Test 1 — d- and f-Block Elements

Cr has electronic config:

Most common ON of lanthanides:

$Cu^{2+}$ ion is:

Color of $MnO_4^-$ is due to:

Number of unpaired electrons in $Fe^{3+}$:

Magnetic moment ($\mu$) formula:

Best catalyst for hydrogenation:

Stainless steel contains:

Most stable lanthanide $+2$ state:

Most stable lanthanide $+4$ state:

Number of unpaired electrons in $Mn^{2+}$:

Maximum oxidation state of Mn:

Number of lanthanides (Ce to Lu):

Assertion (A): Zr and Hf have nearly identical atomic radii. Reason (R): Lanthanide contraction reduces the size of post-lanthanide elements like Hf, making it similar to Zr.

Assertion (A): $Zn^{2+}$ salts are colorless. Reason (R): $Zn^{2+}$ has $d^{10}$ configuration; no d-d transitions are possible.