$Zn$ and $Cd$ metals do not show variable valency because

  • A

    they have only two electrons in the outermost subshells

  • B

    their $d-$ subshells are completely filled

  • C

    their $d-$ subshells are partially filled

  • D

    they are relatively soft metals

Similar Questions

Which of the following has highest ionic radii

Which of the comparison regarding $Zn,\,Cd,\,Hg$ is/are incorrect ?

$(I)$ $ZnCl_2$ is ionic whereas $CdCl_2$ and $HgCl_2$ are covalent

$(II)$ $Zn$ and $Cd$ dissolves in dilute acid $(HCl)$ liberating $H_2$ but $Hg$ can not

$(III)$ $Zn$ and $Cd$ forming with ppt. of $Zn(OH)_2$ and $Cd(OH)_2$ but $Hg$ forms coloured ppt. of

$(IV)$ all from $A_2^{2+}$ type ion

Which of the following order is not correct

Many transition metals form interstitial compounds. The characteristics of these interstitial compounds are

$(I)$ They have high melting points, higher than those of pure metals

$(II)$ They are very hard

$(III)$ They retain metallic conductivity

$(IV)$ They are chemically more reactive than the pure metals

Which ion is not coloured