Chemistry
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
Chemical Reaction
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Answer
All of the above
Reason — When a chemical reaction takes place, the original substances (reactants) are transformed into new substances (products). This transformation can be accompanied by observable changes, such as formation of a precipitate, evolution of a gas, or change in colour.
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Related Questions
When sodium carbonate reacts with dilute hydrochloric acid, the gas evolved is:
- Carbon dioxide
- Nitrogen
- Oxygen
- Hydrogen
One of the conditions necessary for a chemical reaction to occur is :
- Evolution of a gas
- Physical contact between reactants
- Change in colour
- Formation of a precipitate
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): 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.