Q2 of 55 Page 169

Write chemical formula of rust.

Rust is a reddish coating when iron is attacked by moist air. The chemical formula of rust is Fe2O3.xH2O.


More from this chapter

All 55 →
2

Stainless steel is a homogeneous mixture of which three metals?

 2

Mention examples of two alloys.

 2

Explain the following terms:

i. Mineral:


ii. Ore:


iii. Metallurgy:


iv. Centrifugation:


v. Roasting:


vi. Calcination:


vii. Anodic mud:


viii Metallic corrosion:


ix. Alloy:


x. Galvanizing:

 2

Mention the formulas, names and physical states of the products in the following reactions:

(i) 2PbS(s) + 3O2(g)


(ii) MgCO3(s)


(iii) Fe2O3(s) + 3CO(g)


(iv) Fe2O3(s) + 2AI(s)


(v) 2AI(OH)3(s)


(vi) CaO(s) + SiO2(s)


(vii) K2O(s) + H2O(I)


(viii) Mg(s) + 2H2O(I)


(ix) Zn(s) + 2HCI(aq)


(x) Ca(s) + CI2(g)