Advertisements
Advertisements
प्रश्न
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
Advertisements
उत्तर
Sublimation of ammonium chloride – [NH4C1]
Ammonium chloride sublimes on heating and dissociates into ammonia [NH3] and hydrogen chloride [HC1], which recombine on cooling to give back – NH4C1
\[\ce{NH4Cl [s] ⇌ NH3 [g] + HCl [g]}\]
Dissociation is a chemical change.
Hence, the sublimation of such substances involves both – a physical and a chemical change.
APPEARS IN
संबंधित प्रश्न
State whether the following is physical or chemical changes.
shaping a piece of glass —
True or false
Is melting of ice a reversible change?
Fill in the blank
Heat is ________ by a gas during the process of condensation.
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Fill in the blank.
The reaction in which energy is evolved is called
Distinguish between the following.
Physical change and chemical change
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Natural and man-made change.
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
Gas exists in three states as solid, liquid, and gas.
The change of state of a substance from solid to liquid and liquid to gas is ______.
