In first test tube, the following reactions involves: CaCO₃ + 2HCl → CO₂ + H₂O + CaCl₂ CO₂ Gas is evolved here. In second test tube the following reaction takes place: Zn + 2HCl → ZnCl₂ + H₂

You should know that, when lead nitrate is heated, it decomposes into lead monoxide, nitrogen dioxide and oxygen. Here, reaction is given for understanding: 2Pb(NO₃)₂ (s) → 2PbO(s) + 4NO₂ (g) + O₂ (g)

When blue crystals of ferrous sulphate (FeSO₄.7H₂O) are heated, then 7 water molecules are lost & anhydrous ferrous sulphate is formed.

As we know that -rainbow is caused by “Dispersion of Sunlight” by tiny water droplets present in the atmosphere which is one of the applications of dispersion of light.

Class 10th Science Session 2022-23 Class 10 Science Terminal Exams MCQ Solutions Class X Science MCQ Extra Questions Answers 10th Science Terminal Exam Based MCQ Extra Questions