Test: Chemical Equations - Class 10 MCQ

Lead (II) sulfate PbSO₄ 

When the food containing fats and oils starts giving unpleasant taste and smell due to oxidation, then the food becomes rancid.

The substance which take part in reaction is called reactants and the substance which formed after the reaction is called products.

Double displacement reaction: If two reactants exchange their constituents chemically and form two products then the reaction is called double displacement reaction.

Hydrogen gas react with oxygen gas to water. That's why it is a combination reaction. Here, reduction of oxygen by hydrogen also takes place and heat is released during the reaction so it is redox and exothermic reaction.

Number of atoms of each element are equal on both sides in the balanced equation.

Water contains two parts hydrogen and one part oxygen (2H and 1O = H₂O)
Because of this, the amount of hydrogen and oxygen produced during electrolysis of water is in a 2:1 ratio

Silver chloride is a white solid , however it is very sensitive to sunlight and decomposes in the presence of sunlight to form silver (grey in colour) and chlorine. Therefore, in order to avoid this action by light , it is kept in coloured bottles.

CuSO₄ + Fe --------> FeSO₄ + Cu

When iron metal placed in copper sulphate solution, iron displaces copper from copper sulphate solution which is blue in colour to from iron sulphate solution which is green in colour and copper metal ( reddish deposit formed on iron metal) . Iron displaces copper because iron is more reactive then copper

The type of reaction involved is Single Displacement reaction.

When a metal react with acid then hydrogen gas evolve, in this way evolution of gas occurs during chemical reaction. When sodium react with cold water then hear is released, even it also catch fire. Wgen iron react with copper sulphate then copper is displaced by iron and change the colour of solution.