What is redox reaction? When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?

(i). Sodium (Na) is oxidised as it gains oxygen and oxygen gets reduced.  (ii). Copper oxide (CuO) is reduced to copper (Cu) while hydrogen (H2) gets oxidised to water (H2O).

(a) Oxidised substance → C6H6O2  Reduced substance → AgBrO xidising agent → AgBr  Reducing agent → C6H6O2  (b)Oxidised substance → HCHO  Reduced [Ag(NH3)2]+ substance →  Oxidising agent → [Ag(NH3)2]+ Reducing agent → HCHO  (c) Oxidised substance → HCHO  Reduced substance...

Due to high ionisation enthalpy of Be and Mg.

On heating an alkali earth metal or its salt, the electrons are excited easily to higher energy levels because of absorption of energy. When these electrons return to their ground...

Number of moles 12 / 24 = 0.5 mol 

(i) In this reaction, sodium (Na) is changed into sodium oxide (Na2O). This is the addition of oxygen to sodittm. Since addition of oxygen is called oxidation, therefore, the substance...

When magnesium ribbon is exposed to air, it reacts with oxygen in the air to form magnesium oxide. This oxide layer interferes with the burning of magnesium ribbon. Thus, the...

It is a combination reaction.

When magnesium ribbon is burnt, dazzling white flame is observed and there is formation of white ash. Magnesium is said to be oxidised as it is combining with oxygen. ii. The...

(i) 2Mg + O2→ 2MgO + Light 3Mg + N2→ Mg3N2 (a) X is MgO; Y is Mg3N2 (b) MgO + H2O→ Mg(OH)2 (ii) Grapes when attached to the plants are living and therefore,...