Advertisements
Advertisements
प्रश्न
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Advertisements
उत्तर
Zinc nitrate (soluble in water) dissolves in water and is reversible. No change in composition takes place is a physical change whereas zinc reacts with dil. nitric acid to produce H2 gas which gets oxidized to water by nitric acid (oxidizing agent) and hence is a chemical change.
APPEARS IN
संबंधित प्रश्न
Fill in the blank.
A new substance is formed in a ............... change.
Write short answer.
Sublimation is classified as a physical change. Why ?
Classify the following changes as physical or chemical:-boiling
Classify the following as physical or chemical change :
Formation of curd from milk
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Give four difference between physical and chemical changes.
Select the chemical changes from the following list of changes
Drying of a fruit
What type of change is colouring of a paper?
Mention some of the different conditions needed for chemical changes to occur.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
