12. When some substances dissolve in water, hydrolysis occurs, which deepens when the solution is diluted and leads to the formation of a sol (sometimes this also requires heating). Write the formula of the brooms and indicate the sign of the electric charge of the colloidal particles of the sol if the hydrolysis process occurs according to the scheme:
NaCrO2 2H2O→Cr(OH)3↓ NaOH
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