Chemistry
Match the following:
Sodium hydroxide / Ammonium hydroxide solution is added to the solutions containing the ions mentioned in column 1. Match them to the colours of their precipitates in column 2.
| Column 1 | Column 2 |
|---|---|
| (a) Pb2+ | (i) Blue ppt. |
| (b) Fe2+ | (ii) Reddish brown ppt. |
| (c) Zn2+ | (iii) Dirty green ppt. |
| (d) Fe3+ | (iv) Gelatinous white ppt. soluble in excess NaOH |
| (e) Cu2+ | (v) White ppt. soluble in excess NH4OH |
Related Questions
Assertion (A): Zinc oxide reacts with acids as well as bases to form salt and water.
Reason (R): Zinc oxide is amphoteric in nature.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Fill in the blanks sentence case:
(a) …………… (AgCl/PbCl2) is a white precipitate soluble in excess of NH4OH.
(b) Addition of sodium hydroxide solution to ferrous sulphate solution produces a …………… (green/reddish brown) precipitate which is …………… (soluble/insoluble) in excess of NaOH solution.
(c) Ammonium chloride and sodium chloride can be distinguished by heating them with an …………… (acid/alkali).
(d) Element …………… (Fe/Zn/Cu) produces hydrogen by reacting with both acid as well as alkali.
Name:
(a) two coloured metal ions.
(b) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
(c) two bases which are not alkalis but dissolve in strong alkalis.
(d) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
(e) a colourless cation not a representative element.
(f) a yellow monoxide that dissolves in hot and concentrated caustic alkali.
(g) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
(h) a compound containing zinc in the anion.
Write the probable colour of the following salts?
(a) Ferrous salts
(b) Ammonium salts
(c) Cupric salts
(d) Calcium salts
(e) Aluminium salts