Explain why the melting point of sodium chloride is much greater than that of glucose.

Show by the help of a property of sodium chloride that sodium chloride is composed of ions. OR Show how ionic bond is formed in sodium chloride. (Atomic numbers of Na and Cl are 11 and 17 respectively)

Show by drawing a Lewis dot diagram of CH4 that CH4 is formed by covalent bonds. (Atomic numbers of H and C are 1 and 6 respectively)

How is ionic bond formed in sodium fluoride? (The atomic number of F and Na are 9 and 11 respectively). OR C has 4 electrons in its outermost shell and O has 6 electrons in its outermost shell. Draw the Lewis dot diagram of CO2 molecule.

What type of chemical bond is present in NH3? Draw Lewis electron dot diagram of NH3. (The atomic number of H and N are 1 and 7 respectively)

Liquid hydrogen chloride is unable to conduct electricity, but molten sodium chloride is able to conduct electricity — explain

What type of chemical bond is present in MgCl2? How are the chemical bonds formed in MgCl2? (Atomic number of Mg and Cl are 12 and 17 respectively). [1+2] OR Explain why an aqueous solution of sodium chloride is the conductor of electricity but the aqueous solution of sugar or glucose is not. [3]

Identify the electrovalent and covalent compounds from among the following compounds: LiH, NH₃, KCl, C₂H₆

Why is the formula weight appropriately used instead of the molecular weight in the case of the ionic compounds?

Define the Octet rule. Give two examples of such compounds in which an exception to the Octet rule is observed. OR Write two important differences between ionic and covalent compounds.

Distinguish between naphthalene and sodium chloride by two physical properties.

Which of the following compounds has no existence as a separate and distinct molecule? (a) H₂S (b) CHCl₃ (c) NO₂ (d) NaCl