Match the following : 

Elements	Electronic configuration
i. 61	a. [Rn]5f136d0 7s 2
ii. 91	b. [Xe]4f56s2
iii. 101	c. [Rn]5f146d77s2
iv. 109	d. [Rn] 5f2 6d17s2

 

	i	ii	iii	iv
1.	b	d	a	c
2.	c	a	d	b
3.	c	d	a	b
4.	a	c	b	d

Transition metals and their many compounds act as good catalysts due to :

Transition metals show paramagnetic behaviour due to:

Consider the following statements: 

Correct statements amongst the above are:

The correct statement(s) about interstitial compounds is/are:

The spin-only magnetic moment of ${\mathrm{Ce}}^{3+}$ is -

Match the following:

In an aqueous solution, coloured ions would be:

1. ${\mathrm{Ti}}^{3+},{\mathrm{V}}^{3+},$ ${\mathrm{Cu}}^{+}$

2. ${\mathrm{Sc}}^{3+},$ ${\mathrm{Mn}}^{2+},$ ${\mathrm{Fe}}^{3+}$

3. ${\mathrm{Ti}}^{3+},{\mathrm{V}}^{3+},$ ${\mathrm{Mn}}^{2+},$ ${\mathrm{Fe}}^{3+},$ $$ ${\mathrm{Co}}^{2+}$

4. None of the above.

The correct reactions among the following are:

$\mathrm{a}.$ ${\mathrm{MnO}}_4^{-}+{\mathrm{H}}^{+}+{\mathrm{Fe}}^{2+}\to 2{\mathrm{Mn}}^{2+}+{\mathrm{Fe}}^{3+}+{\mathrm{H}}_2\mathrm{O}$
$\mathrm{b}.$ ${\mathrm{C}}_2{\mathrm{O}}_4^{2-}+{\mathrm{MnO}}_4^{-}+{\mathrm{H}}^{+}\to {\mathrm{Mn}}^{2+}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2$
$\mathrm{c}.$ ${\mathrm{SO}}_2+{\mathrm{MnO}}_4^{-}+{\mathrm{H}}^{+}\to {\mathrm{Mn}}^{2+}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{SO}}_3$

1. a and c

2. b and c

3. a and b

4. a, b and c

The correct statement(s) about transition elements are: