State (i) composition (ii) reason for alloying (iii) one use of each of the following alloys.

(i) Brass

(ii) Bronze

(iii) Duralumin

(iv) Solder [fuse metal]

(v) Stainless steel

Loss of electrons from an element 'X' is represented by : X - 3e^- ⟶ X³⁺ [X ⟶ X³⁺ + 3e^-)

1. X is a …………… [metal/non-metal] and will form …………… [electrovalent/covalent] compounds only.

2. X³⁺ formed is a …………… [cation/anion] and element 'X' has a valency of …………… [+2/+3/-3].

3. If X³⁺ combines with oxygen the formula of the product is …………… [X₂O₃ / XO / X₃O₂]

4. If the above product in the …………… [solid/molten] state is electrolysed the ion X³⁺ will get discharged at the …………… (anode/cathode).

5. The ion X³⁺ …………… [accepts/loses] electrons and gets …………… [oxidized/reduced] to neutral …………… [ions/atoms/molecules].

The common name of the ore of iron whose chemical formula is Fe₃O₄.

1. Iron pyrites
2. Magnetite
3. Haematite
4. Spathic iron ore

The chemical name of the main ore of aluminium.

1. Aluminium fluoride
2. Aluminium oxide
3. Sodium aluminium fluoride
4. Hydrated aluminium oxide