(a) Explain why : respiration is an exothermic reaction
(b) A colourless lead salt when heated produces a yellow residuces a yellow residue and brown fumes. (i) Name the lead salt (ii) Name the brown fumes (iii) What the chemical equation for the reaction involved ?

A colourless lead salt, when heated , produces a yellow residue and brown fumes. (a) Name the lead salt. (b) Name the brown fumes. (c) Write a chemical equation of the reaction involved.

Explain why : (a) Respiration is na exothermic reaction. (b) When blue salt of copper sulphate is heated, it becomes colourless.

A White salt upon heating decomposes to give brown fumes and a residue is left behind. (i) Name the salt. (ii) Write the equation for the decomposition reaction.

When a green iron salt is heated strongly , its colour finally changes to brown and odour of burning sulphure is given out . (a) Name the iron salt. (b) Name the type of reaction that takes place during the heating of iron salt. (c) Write a chemical equation for the reaction involved.

(a) Name the reaction which is usually sued in the conversion of vegetable oils to fats. Explain the reaction involved in detail .Write a chemical equation to illustrate your answer (b) What is saponification? Write the chemical equation of the reaction involved in this process. Name all the substances which take part in this process and also those which are formed. (c ) Why does micelle formation take place when soap is added to water ? will a micelle be formed in other solvents like ethanol also?

No chemical reaction takes place when granules of a rusty brown solid A re mixed with the powder of another solid B. however, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. it was observed that the reaction is highly exothermic. (a) What could the solids A and B be? (b) What are the products C and D most likely to be? (c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. Mention the physical states of all the reactants and products in this equation and indicate tthe heat change which takes place. (d) What is the special name of such a reaction? State one use of such a reaction. (e) Name any two types of chemical reaction under which the above reaction can be classified.