Question

17. Washing soda and iron (III) chloride are separately exposed to the atmosphere. State i] the observations
seen, ii] the phenomenon which occurs, iii) the reason for the phenomenon occurring in each case.
Would a similar phenomenon occur in case of exposure of common salt. Explain giving reasons.
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Answer 1

Answer:

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Explanation:

i) Observations- (Washing soda)

a) Looses its moisture

b)becomes amorphous

c)coated with white powder

Observations-(Iron (III) Chloride)

a) absorbs moisture from the atmosphere

b) Dissolves in moisture and changes into liquid state

ii) Phenomenon in case of washing soda- efflorescence( reason-it becomes amorphous and coated with white powder which is the characteristics of efflorescence.)

Phenomenon in case of iron (III) chloride- Deliquescence( reason- it absorbs moisture from the atmosphere and changes into liquid state which is the characteristic of deliquescence.)

iii) No, in case of common salt, no such phenomenon can occur as it is anhydrous and does not contain water of crystallization.