Chlorine for bleaching of paper

Large amount of water alone for washing clothes

Tetrachloroethene for laundry

Liquified CO₂ for dry cleaning of clothes

$${[Ni{(CN)_4}]^{2 - }} > {[NiC{l_4}]^{2 - }} > {[Ni{({H_2}O)_6}]^{2 + }}$$

$${[Ni{({H_2}O)_6}]^{2 + }} > {[NiC{l_4}]^{2 - }} > {[Ni{(CN)_4}]^{2 - }}$$

$${[NiC{l_4}]^{2 - }} > {[Ni{({H_2}O)_6}]^{2 + }} > {[Ni{(CN)_4}]^{2 - }}$$

$${[NiC{l_4}]^{2 - }} > {[Ni{(CN)_4}]^{2 - }} > {[Ni{({H_2}O)_6}]^{2 + }}$$

B(OH)₃ and H₃PO₃

B(OH)₃ and Al(OH)₃

NaOH and Ca(OH)₂

Be(OH)₂ and Al(OH)₃

$$BrO_4^ - $$

$$Br{O^ - }$$

$$BrO_2^ - $$

$$BrO_3^ - $$