Chemistry
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.
Answer
Both A and R are true but R is not the correct explanation of A.
Reason — A is true as when silver nitrate solution is added to sodium chloride solution, a white precipitate of silver chloride is formed.
R is true as some reactants need to be heated to undergo a chemical change.
Silver nitrate + Sodium chloride ⟶ Silver chloride + Sodium nitrate
But in this reaction no heating was required. Therefore, Both A and R are true but R is not the correct explanation of A is the correct option.
Related Questions
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.
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.
Fill in the blanks:
(a) The substances which undergo chemical change are called …………… .
(b) The substances formed as a result of a chemical reaction are called …………… .
(c) During a chemical reaction, transfer of …………… takes place.
(d) The basic condition necessary for a chemical reaction is …………… .
(e) In some chemical reactions, an insoluble …………… is formed when two solutions are mixed.