wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

By observing the mentioned events below, which of the following shows chemical change?
(i) Heating iodine changes the colour from bluish black to purple
(ii) Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance
(iii) Mixing an acid and a base solution raises the temperature.
(iv) Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell


A

(i), (ii), (iii)

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

(i), (ii), (iv)

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

(ii), (iii), (iv)

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

(i), (ii), (iii), (iv)

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D

(i), (ii), (iii), (iv)


If you were observing only the changes without knowing the underlying reaction, all four of the given events may be chemical reactions because:
(i) Colour change has taken place
(ii) Change of state from gas to solid
(iii) Change in temperature is observed
(iv) A gas has been released


flag
Suggest Corrections
thumbs-up
0
similar_icon
Similar questions
View More
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Evaporation
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon