Chemistry
Assertion (A): There is a need to balance a chemical equation.
Reason (R): Matter can neither be created nor be destroyed, it can only be converted from one form to another.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
Both A and R are true and R is the correct explanation of A.
Reason — A is true as we need to balance a chemical equation so that the number of atoms of each element is the same on both sides.
R is true as the law of conservation of mass states that mass can neither be created nor destroyed, it can only be transformed from one form to another.
Therefore, Both A and R are true and R is the correct explanation of A is the correct option.
Related Questions
What happens when a chemical reaction takes place ?
- A precipitate is formed
- A gas is evolved
- The substance changes its colour
- All of the above
Assertion (A): A chemical reaction can be written in the form of a chemical equation with the help of symbols and formulae of the substances involved.
Reason (R): In a chemical equation, the reactants are written on the right hand side and products are written on the left hand side of the arrow.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): When a few drops of an aqueous solution of silver nitrate are added to the aqueous solution of sodium chloride, a white precipitate of silver chloride is formed.
Reason (R): Some substances react only when they are heated together.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): The correct formula of magnesium chloride is Mg2Cl.
Reason (R): The combining capacity of magnesium is two, while that of chlorine is one.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.