" The atomicity of "K_(2)Cr_(2)O_(7)" is "

The atomicity of K_2Cr_2O_7 is

Which is not related to the reactions of K_(2)Cr_(2)O_(7) ?

In the standardisation of Na_(2)S_(2)O_(3) using K_(2)Cr_(2)O_(7) by iodometry the equivalent weight of K_(2)Cr_(2)O_(7) is

In the neutralization of Na_(2)S_(2)O_(3) using K_(2)Cr_(2)O_(7) by idometry, the equivalent weight of K_(2)Cr_(2)O_(7) is