MOCK TEST - 1

Name the decomposition reaction that takes place in our body. (Blood circulation / Dehydration / Digestion)

What type of reaction is involved in the rancidity? (Reduction/ Oxidation)

Give an example of a precipitate.

What is meant by balancing of a chemical equation?

What is the colour of the precipitate formed when lead nitrate reacts with potassium iodide? (Yellow / White / Black)

Does the atoms of one element change into another element during a chemical reaction?

Consider the chemical reaction represented by the following equation:
$\mathrm{M}\mathrm{n}{\mathrm{O}}_2+4\mathrm{H}\mathrm{Cl}\to \mathrm{M}\mathrm{n}{\mathrm{Cl}}_2+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{Cl}}_2$ and write the name of the substances which are oxidised, reduced, oxidising agent and reducing agent in the reaction.

Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in open. Suggest one method to prevent it.