Question

On heating a substance X in air, a combination reaction occurred. Which of the following could be X
Limestone chips
Sulphur powder
lead nitrate
hydrated copper sulphate ​

Answer 1

Answer:

This chapter deals with various chemical reactions, their examples and corresponding chemical equations. A chemical reaction is a process in which new substances with new properties are formed. It involves rearrangement of atoms and breaking of chemical bonds.

In a chemical reaction mainly there will be two sides, one is reactant side and the other one is the product side. Two reactants combine to form products or reactants are transformed into products in a chemical reaction. The method of representing a chemical reaction with the help of symbols and formulae of the substance involved is known as chemical equations.

Answer 2

Heating of Sulphur powder in air  produces sulphur-di-oxide. This reaction is combustion reaction

Explanation:  

• Combustion reaction occur when oxygen reacts with another element and emits heat and light. The burning of sulphur, natural gas, and sparklers are all examples of combustion reactions.  

• When the sulfur powder is burned in the air, it forms SO₂.

• Sulphur dioxide is produced when sulfur reacts with oxygen during combustion.

                                             S + O₂ → SO₂  

• A little amount of sulphur is placed in a deflagrating spoon, heated in a Bunsen burner until it begins to burn, and then lowered into a jar of pure oxygen. The sulphur then flares up into a considerably brighter blue flame, emitting sulphur dioxide and trioxide gases in the process. It will ignite if heated above 445⁰C.