Advertisement Remove all ads

A Chemical Reaction is Generally Accompanied by Certain External Indications Or Characteristics. Mercury (Ii) Oxide - Chemistry

Short Note

A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – mercury [II] oxide.

Advertisement Remove all ads


Change of colour — In certain chemical reactions a change of colour is seen to be observed. Heat on substances to observe change in colour of reactants and products.

Heat on:

Mercury [II] oxide 2HgO → 2Hg + O2 [g]

Colour change:

Mercury [II] oxide [HgO] – Red – to Mercury [Hg] – Silvery

Concept: Chemical Equation
  Is there an error in this question or solution?
Advertisement Remove all ads


Viraf J. Dalal Class 7 New Simplified Middle School Chemistry
Chapter 5 Language of Chemistry
Exercise | Q 3.3
Advertisement Remove all ads
Advertisement Remove all ads

View all notifications

      Forgot password?
View in app×