When corrosion of silver occurs black coating appears. The black coating indicates ……………

$CaO+H_{2}O⟶Ca(OH{)}_2⟶+QCaO+H\_2O\backslash longrightarrow\; Ca(OH)\_2\backslash longrightarrow+\; Q$ (heat energy) The above reaction is an example of ……………

$Zn+2HCl⟶ZnC{l}_2+H_{2}Zn+2HCl\backslash longrightarrow\; ZnCl\_2+H\_2$ The above reaction is an example of ……………

Rising of dough with yeast depends on ……………… of sugars to carbon dioxide and water.

Which of the following one is hard and does not rust?

To slow down which of the following, we keep the food in air-tight containers?

Precipitate in a reaction is indicated by which arrow mark?

Calcium hydroxide is a ………………….. solution.

Unbalanced equation is called

A chemical equation, which contains the same number of atoms of different elements on reactant side and product side is