What are covalent compounds ? How are they different from ionic compounds ? List any two properties of covalent compounds.

Ionic → (ii) Ammonium phosphate (NH4)3PO4, (x) LiBr  Metallic → (viii) Brass, (ix) Rb  Molecular → (i) Tetra phosphorus decoxide (P4O10), (iv) I2, (v) P4.  Covalent (network) → (iii) SiC, (vii) Graphite, (xi)...

(i) The basis of similarities between metallic and ionic crystals is that both these crystal types are held by the electrostatic force of attraction. In metallic crystals, the electrostatic force...

Carbon has 4 electrons in its outermost shell, and needs to gain or lose 4 electrons to attain noble gas configuration. Losing or gaining 4 electrons is not possible due...

(i) (a) Ionic compounds have strong force of attraction between the oppositely charged ions (e.g., Na+ and Cl–), so they are solids. Covalent compounds have weak force of attraction between...

Acetic acid is colourless liquid. It is miscible/ soluble in water. On adding a pinch of sodium hydrogen carbonate, Brisk effervescence is observed. Evolution of a colourless/ odourless gas.

(b) Under the Mahalwari system, revenue, settlement was to be made by village or estates with the landlords. In the Ryotwari system, a direct settlement was made between the government...

(c) First Anglo-Burmese War – Burmese defeated, Treaty of Yandobo (1826); First Anglo-Afghan War – Afghan defeated (1838); First Anglo-Maratha War – Britishers were defeated, Treaty of Salbai (1782); Second...

(b) APEC is the group of 21 countries. APEC is short for Asia Pacific Economic Cooperation. This group of countries span half the surface of the earth and are home...

(a) Ionic compound is a chemical compound in which ions are held together in a lattice structure by ionic bonds. Following the aphorism, "like dissolves like", ionic compounds dissolve in...

(a) Covalent compounds only