You select any one device for sound communication other than independent, oral or printed communication and explain its working with the help of diagram. (See Lesson 18)
(b) (i) Explain the following: (See lesson-4)
· Ionic compounds conduct electricity in molten state but covalent compounds cannot conduct electricity in molten state.
· The melting point of naphthalene is 353.4K the melting point of sodium chloride is 1074K.
(ii) Explain Redox Reaction with example.
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An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. The formation of hydrogen fluoride is an example of a redox reaction. We can break the reaction down to analyze the oxidation and reduction of reactants.
for (ii)
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