Consider the change in oxidation state of bromine corresponding to different emf values as shown in the diagram below: 
 

The species undergoing disproportionation is:

Iron exhibits bcc structure at room temperature. Above 900 °C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900 °C is:

(Molar mass and atomic radii of iron remain constant with temperature) 

1. $\frac{\sqrt{3}}{\sqrt{2}}$

2. $\frac{4\sqrt{3}}{3\sqrt{2}}$

3. $\frac{3\sqrt{3}}{4\sqrt{2}}$

4. $\frac{1}{2}$

The incorrect statement among the following is:

1.	Total orbital angular momentum of an electron in 's' orbital is equal to zero.
2.	An orbital is designated by three quantum numbers, while an electron in an atom is designated by four quantum numbers.
3.	The electronic configuration of N atom is
4.	The value of m for dz2 is zero.

An element that cannot form ${\mathrm{MF}}_6^{3-}$ ion is-

How many lone pairs of electrons are present on the central chlorine atom in the structure of ClF₃?

1. One (1)

2. Two (2)

3. Four (4)

4. Three (3)

Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

1. Fe

2. Zn

3. Mg

4. Cu