Practicing Success
Colourless salt (A) gives white ppt (B) with NaOH; ppt (B) dissolves in excess of NaOH to form (C). On passing H2S gas into (A) solution white ppt (D) appears. (A) also gives white ppt (E) with AgNO3 solution. |
Which of the following is compound B? |
Fe(OH)3 Zn(OH)2 Cu(OH)2 None of these |
Zn(OH)2 |
Zinc (II) ion such as one present in zinc nitrate reacts with sodium hydroxide to form sodium nitrate and a white precipitate of zinc hydroxide.
2NaOH+ZnCl2 → 2NaCl + white precipitate Zn(OH)2 |