List out the instruments that use electrochemical cells. What are the merits and demerits of using such cells?

List out the uses of ethanoic acid.

List out the merits and demerits of detergents, compared to soaps.

List some devices which use electromagnets.

Natural fibres and synthetic fibres are used in the field of textile manufacturing. Compare their merits and demerits and tabulate.

Mendeleev arranged the elements in the order of increasing atomic weights. a) Write down the merits of Mendeleevis periodic table. b) What are the demerits of Mendeleev's periodic table?