Chemistry
When copper metal is added to a solution of silver nitrate, the colour of the solution changes to blue. This shows:
- copper is less reactive than silver
- copper is more reactive than silver
- both are equally reactive
- none of the above
Answer
copper is more reactive than silver
Reason — When copper (Cu) is added to a solution of silver nitrate (AgNO₃), a displacement reaction occurs. Copper displaces silver from silver nitrate because copper is more reactive than silver.
Cu (s) + 2AgNO3 (aq) → Cu(NO3)2 (aq) + 2Ag (s)
Related Questions
The acidic gas produced when lead nitrate is heated is :
- PbO
- NO₂
- MgO
- N₂O
The gas produced when iron metal reacts with dilute hydrochloric acid is:
- oxygen
- hydrogen
- chlorine
- water vapour
Assertion (A): A chemical reaction is a process which involves the transformation of one or more substances into new substances with entirely different properties.
Reason (R): Breaking of chemical bonds between the atoms of reacting susbtances takes place to form new bonds between the atoms forming new substances called as products.
- 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.