Match the catalysts to the correct process. Catalyst Process A. T i C l 3 i. Wacker process B. P d C l 2 ii. Ziegler – Natta polymerisation C. C u C l 2 iii. Contact process` D. V 2 O 5 iv. Deacon’s process

A → i i , B → i , C → i v , D → i i i

A → i i i , B → i , C → i i , D → i v

A → i i i , B → i i , C → i v , D → i

A → i i , B → i i i , C → i v , D → i

Give reason and select one atom/ion which will exhibit asked property : Cr or Cu (High melting and boiling point)

Chromium ( Cr ) has a higher melting point because of the half filled stability. Its electronic configuration is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 1 3 d 5 . Due to the half filled d- orbital, the unpaired electrons forms strong intermetallic bonds hence resulting in high melting point and boiling point. Whereas, the electronic configuration of copper ( Cu ) is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 9 . It does not have half filled stability.

Mercury is the only metal which is liquid at 0 ∘ C . This is due to

very high ionisation energy and weak metallic bond

HARD

Earn 100

Explain why d-block elements show high electrical conductivity.

Important Questions on The Periodic Table

EASY

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

What is the general electronic configuration of

d

-block elements?

HARD

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

The compound with empirical formula

{CoCl}_{3} . 6 {NH}_{3}

showed conductivity corresponding to three ions. The complex is

EASY

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Assertion: In general, transition metals have high melting points.

Reason: More number of electrons from ' $(n - 1) d$ ' and ' $ns$ ' are involved in interatomic metallic bonding.

The correct option among the following is

EASY

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

The transition elements that has the lowest enthalpy of atomisation is:

EASY

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Give reasons for the enthalpy of atomisation of transition metals is high.

MEDIUM

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

The pair of metal ions that can give a spin only magnetic moment of

3.9 B M

for the complex

[M {(H_{2} O)}_{6}] C l_{2}

, is:

EASY

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Which of the following set of transition metals have high volatility?

MEDIUM

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

A compound of vanadium chloride has spin only magnetic moment of

1.73

BM. Its formula is

EASY

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Why do transition metals have high enthalpies of atomization?

MEDIUM

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Discuss the changes in following properties of the first transition series: Metallic character

EASY

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

When heated in air, brown copper powder turns black. This black powder would turn brown again when heated with

EASY

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Give reasons:
Iron has higher enthalpy of atomization than that of copper.

HARD

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Spin only magnetic moment

2 .84 BM

is given by:

(Atomic Number of

Ni =28, Ti =22, Cr =24, Co =27

)

EASY

Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Match the catalysts to the correct process.

	Catalyst		Process
A.	$T i C l_{3}$	i.	Wacker process
B.	$P d C l_{2}$	ii.	Ziegler – Natta polymerisation
C.	$C u C l_{2}$	iii.	Contact process`
D.	$V_{2} O_{5}$	iv.	Deacon’s process