(a) Why is La(OH)_(3) is more basic than Lu(OH)_(3) ? (b) Why ar the properties of third transition series quite similar to second transition series.
Explain the following : (a) Out of Sc^(3+), Co^(2+) " and "Cr^(3+) "ions, only "Sc^(3+) is colourless in aqueous solutions. (Atomic no.: Co =27, Sc = 21 and Cr =24) (b) The E^(@)Cu^(2+)//Cu for copper metal is positive (+0.34), unlike the remaining members of the first transition series. (c) La(OH)_(3) " is more basic than Lu "(OH)_(3).
STATEMENT-1 : Lu(OH)_(3) is more basic than Ce(OH)_(3) and STATEMENT-2: Lu^(+3) has smaller size than Ce^(+3)
Explain the following : La(OH)_3 is more basic than Lu(OH)_3
Assertion : La(OH)_3 is more basic than Lu(OH)_3 . Reason : Basic character of hydroxides of lanthanoids decrease on moving from La^(3+) to Lu^(3+)
A: La(OH)_(3) , is less basic than Lu(OH)_(3) , R: Basic character of hydroxides of lanthanoids increase on moving from La^(+3) to Lu^(+3)
What is lanthanoid contraction? (b) Write any one use of lathanoid (c) \(La(OH)_{2}\) is more basic than \(Lu(OH)_{3}\) .Explain.
Knowledge Check
STATEMENT-1 : Lu(OH)_(3) is more basic than Ce(OH)_(3) and STATEMENT-2: Lu^(+3) has smaller size than Ce^(+3)
A
Statement-1 is True , Statement-2 is True , Statement-2 is a correct explanation for Statement-1
B
Statement-1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation for Statement-1
C
Statement-1 is True , Statement-2 is False
D
Statement-1 is False , Statement-2 is True
Assertion : La(OH)_3 is more basic than Lu(OH)_3 . Reason : Basic character of hydroxides of lanthanoids decrease on moving from La^(3+) to Lu^(3+)
A
Assertion and reason both are correct statements and reason is correct explanation for assertion.
B
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C
Assertion is correct statement but reason is wrong statement.
D
Assertion is wrong statement but reason is correct statement
A: La(OH)_(3) , is less basic than Lu(OH)_(3) , R: Basic character of hydroxides of lanthanoids increase on moving from La^(+3) to Lu^(+3)
A
If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C
If Assertion is true statement but Reason is false, then mark (3)
D
If both Assertion and Reason are false statements, then mark (4)
