In first transition series, the melting point of $Mn$ is low because
Due to ${d^{10}}$ configuration, metallic bonds are strong
Due to ${d^7}$ configuration, metallic bonds are weak
Due to ${d^5}$ configuration, metallic bonds are weak
None of these
Which alloy contains $Cu, Sn$ and $Zn$
Which of the following does not contain copper
The ability to form complex compounds by the transitional metal ion is due to
Which of the following may be colourless
Coloured salts are formed by