Chemistry
State the variable valencies of the following elements and give their names. (a) Cu, (b) Ag, (c) Hg, (d) Fe, (e) Pb, (f) Sn, (g) Mn, (h) Pt, (i) Au
Answer
| Sl. No. | Element | Valency | Name |
|---|---|---|---|
| (a) | Cu | Cu1+ Cu2+ | Copper [I] i.e., cuprous Copper [II] i.e., cupric |
| (b) | Ag | Ag1+ Ag2+ | Silver [I] Argentous Silver [II] Argentic |
| (c) | Hg | Hg1+ Hg2+ | Mercury [I] Mercurous Mercury [II] Mercuric |
| (d) | Fe | Fe2+ Fe3+ | Iron [II] Ferrous Iron [III] Ferric |
| (e) | Pb | Pb2+ Pb4+ | Lead [II] Plumbous Lead [IV] Plumbic |
| (f) | Sn | Sn2+ Sn4+ | Tin [II] Stannous Tin [IV] Stannic |
| (g) | Mn | Mn2+ Mn4+ | Manganese [II] Manganous Manganese [IV] Manganic |
| (h) | Pt | Pt2+ Pt4+ | Platinum [II] Platinous Platinum [IV] Platinic |
| (i) | Au | Au1+ Au3+ | Gold [I] Aurous Gold [III] Auric |
Related Questions
Give examples of eight metals which show variable valency. State the valency of sulphur in :
(a) SO2
(b) SO3State the valency in each case and name the following elements or radicals given below :
- K
- Cr2O7
- Cl
- Ni
- ClO3
- CO3
- Ba
- HCO3
- NO2
- Na
- Br
- Zn
- Mg
- O
- Co
- CrO4
- ClO
- MnO4
- Li
- I
- OH
- O2
- ZnO2
- SiO3
- NO3
- SO3
- SO4
- PO4
- N
- C
- PO3
- Al
- Ca
- H
- PbO2
- HSO3
- AlO2
- Cr
- HSO4
- NH4
State which of the following elements or radicals are divalent –
(a) Lithium, (b) Nickel, (c) Ammonium, (d) Bromide, (e) Sulphite, (f) Nitride, (g) Carbide, (h) Chromium, (i) Bisulphite, (j) Dichromate, (k) Permanganate.
Explain the meaning of the term 'compound' with a suitable example. State the main characteristics of a compound with special reference to the compound iron [II] sulphide.