Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store
seo-qna
SearchIcon
banner

Reaction of Zn(OH)₂ with NaOH produces
(A) Na₂ZnO₂
(B) ZnO
(C) Na₂O
(D) None of these

Answer
VerifiedVerified
433.5k+ views
1 likes
like imagedislike image
Hint :Hydroxide of zinc Inorganic chemical compound Zn(OH)₂. Wülfingite (orthorhombic), ashoverite, and sweetite are three rare minerals that contain it (both tetragonal). Zinc hydroxide (and Zinc oxide) is amphoteric, like the hydroxides of other metals such as lead, aluminium, beryllium, tin, and chromium. As a result, it dissolves readily in a dilute solution of a strong acid, such as HCl, as well as an alkali solution, such as sodium hydroxide.

Complete Step By Step Answer:
Hydroxide of zinc Inorganic chemical compound Zn(OH)₂. Wülfingite (orthorhombic), ashoverite, and sweetite are three rare minerals that contain it (both tetragonal). Zinc hydroxide (and Zinc oxide) is amphoteric, like the hydroxides of other metals such as lead, aluminium, beryllium, tin, and chromium. As a result, it dissolves readily in a dilute solution of a strong acid, such as HCl, as well as an alkali solution, such as sodium hydroxide.
The inorganic compound sodium hydroxide, also known as lye or caustic soda, has the formula NaOH. It's a white ionic compound made up of sodium cations Na⁺ and hydroxide anions OH⁻.
 Zn(OH)2+2NaOHNa2[Zn(OH)4]
This is an acid-base (neutralisation) reaction: NaOH is a base, and Zn(OH)₂ is an acid.
This is a complexation reaction, and the generated complex is Na₂[Zn(OH)₄].
If too much sodium hydroxide is added, the zinc hydroxide precipitate dissolves, leaving a colourless zincate ion solution.
This property can be used to detect zinc ions in solution, but it isn't unique because aluminium and lead compounds have similar properties. Unlike aluminium and lead hydroxides, zinc hydroxide forms a colourless, water-soluble ammine complex when exposed to excess aqueous ammonia.
Option (A) is correct answer.

Note :
If too much sodium hydroxide is added, the zinc hydroxide precipitate dissolves, leaving a colourless zincate ion solution.
This property can be used to detect zinc ions in solution, but it isn't unique because aluminium and lead compounds have similar properties. Unlike aluminium and lead hydroxides, zinc hydroxide forms a colourless, water-soluble ammine complex when exposed to excess aqueous ammonia.


Latest Vedantu courses for you
Grade 8 | CBSE | SCHOOL | English
Vedantu 8 CBSE Pro Course - (2025-26)
calendar iconAcademic year 2025-26
language iconENGLISH
book iconUnlimited access till final school exam
tick
School Full course for CBSE students
EnglishEnglish
MathsMaths
ScienceScience
₹49,800 (9% Off)
₹45,300 per year
Select and buy