State the type of chemical reaction. N 2 + O 2 → 2 NO

It is a synthesis reaction. When two or more elements or simple compounds combine to form a single product, the reaction is a synthesis reaction. During synthesis reaction, energy is released and only one new substance is formed.

State the type of chemical reaction. 2 NO + O 2 → 2 NO 2

It is a synthesis reaction. When two or more elements or simple compounds combine to form a single product, the reaction is a synthesis reaction. During synthesis reaction, energy is released and only one new substance is formed.

State the type of chemical reaction. Fe + 2 HCl → FeCl 2 + H 2

It is a single displacement reaction. Iron being more reactive than hydrogen is placed above hydrogen in activity series of metal and displaces hydrogen from hydrochloric acid and forms two new products iron (II) chloride and hydrogen gas.

State the type of chemical reaction. KOH + HNO 3 → KNO 3 + H 2 O

It is a neutralization reaction. When acids react with bases the products formed are soluble salt and water, this reaction is called neutralization reaction. Here, soluble salt is potassium nitrate.

State whether Cu → Cu + 2 is getting oxidized or reduced.

It is an oxidation reaction because there is loss of electrons. The oxidation number of copper increases from 0 to 2 i.e there is loss of two electrons. If oxidation number increases, it is oxidized and if oxidation number decreases, it is reduced. Hence, copper is getting oxidized as it loses electrons. The electron transfer equation is- Cu - 2 e - → Cu + 2 .

State whether O 2 - → O 2 is getting oxidized or reduced.

Balanced equation- 2 O 2 - → O 2 It is an oxidation reaction because there is loss of electrons. The oxidation number of oxygen increases from - 2 to 0 hence, oxygen is getting oxidized because there is loss of four electrons (to balance the charge on both the side). The electron transfer equation is- 2 O 2 - - 4 e - → O 2 .