i. What do you see when a magnesium ribbon is burnt? Is magnesium oxidised or reduced in this reaction? ii. Define corrosion.

(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...

Number of moles 12 / 24 = 0.5 mol 

We can see any object, when light reflected by that object reaches our eyes. But in the dark room, no light is reflected by the object so we are unable...

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.

i. The reaction in which one reactant gets oxidised and the other reactant gets reduced is called redox reaction. ii. When a magnesium ribbon burns in air with a dazzling flame...

(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,...

The earth is looking spherical in shape. Yes, I can see the surface of the moon. The following questions arise in my mind after looking at this picture:  (i) Who look...

Yes, I had once burnt my tongue on drinking very hot tea. When some food is very hot, I cool it by blowing on it, by keeping it in a...