Which of the following options is/are true about Lunar Caustic?

It gives a yellow precipitate with

N a I

solution

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

It is formed when aurum is treated with hot nitric acid

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

It gives a yellow precipitate with

N a_{3} P O_{4}

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

It gives a white precipitate with hypo solution which gradually turns black on boiling

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

Open in App

Solution

The correct options are
A It gives a yellow precipitate with $N a I$ solution
C It gives a yellow precipitate with $N a_{3} P O_{4}$
D It gives a white precipitate with hypo solution which gradually turns black on boiling
Lunar caustic is $A g N O_{3}$
a) $A g N O_{3} + N a I \to A g I y e l l o w ↓ + N a N O_{3}$
b) Aurum is the latin word for gold. So Aurum with nitric acid will not give $A g N O_{3}$ .
c) $3 A g N O_{3} + N a_{3} P O_{4} \to A g_{3} P O_{4} y e l l o w + 3 N a N O_{3}$
d) $2 A g N O_{3} + N a_{2} S_{2} O_{3} \to A g_{2} S_{2} O_{3} w h i t e p p t ↓ + 2 N a N O_{3}$
$A g_{2} S_{2} O_{3} + H_{2} O \to A g_{2} S b l a c k p p t + H_{2} S O_{4}$

Suggest Corrections