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)

(i) copper displace iron (ii) blue colour of copper sulphate solution is obtained (iii) reaction is exothermic (iv) no reaction takes place

True, inertia increases with increase in mass and decreases with decrease in mass. So, a heavy object has more inertia than a lighter one.

Lets take an example, a cricket ball has more inertia because it has more mass (it is quite heavy). On the other hand, a rubber ball has less inertia because it has less mass (it is light). Hence, the inertia ...