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प्रश्न
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
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.
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Fill in the blank.
Growing of a seedling into a plant is _______ change.
State whether the following is physical or chemical changes.
shaping a piece of glass —
True or false
Is melting of ice a reversible change?
Name two reversible changes.
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
What is a chemical change ? Give two examples of chemical changes.
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
