An oxide of copper which is red in colour has the formula
$CuO$
$Cu_2O$
$CuO_2$
$Cu_2O_2$
Assertion : The free gaseous $Cr$ atom has six unpaired electrons
Reason : Half-filled s orbital has greater stability.
Why $\mathrm{E}^{\circ}$ values for $\mathrm{Mn}, \mathrm{Ni}$ and $\mathrm{Zn}$ are more negative than expected?
Effective magnetic moment of $S{c^{ + 3}}$ ion is
The trivalent ion having largest size in following is
Coloured salts are formed by