Cr³+ and Al³+ Flashcards
1
Q
Cr³+ + NaOH mention colour too
A
Cr(OH)3 (green)
2
Q
Cr³+ + AqNH3 mention colour too
A
[Cr(NH3)6]³+ violet or pink solution
3
Q
Cr³+ + S2O8²-
A
CrO4²- + SO4² + H+
4
Q
CrO4²- + BaCl2/CH3COOH mention colour too
A
BaCrO4(yellow)
5
Q
CrO4²- + H+ + H2O2 mention colour too
A
CrO5 (blue)
6
Q
Is CrO5 soluble in ether or amyl alcohol?
A
Yes
7
Q
On standing longtime, what does CrO5 give? Does it happen when ether is used?
A
Cr³+ + O2, No
8
Q
Al³+ + NaOH mention colour too
A
Al(OH)3 (white)
9
Q
Al(OH)3 + excess NaOH
A
(Al(OH)4)- + Na+
10
Q
Does Al³+ give Al(OH)3 with NH4OH also? Does it further react to give complex?
A
Yes, but it doesnot give complex
11
Q
(Al(OH)4)‐ + NH4Cl
A
Al(OH)3 + NH3
12
Q
What does (Al(OH)4)- give in acidic medium?
A
Al(OH)3
