1

### JEE Advanced 2014 Paper 1 Offline

Numerical
A list of species having the formula XZ4 is given below.

XeF4, SF4 ,SiF4, $BF_4^-$, $BrF_4^-$, [Cu(NH)3]2+, [FeCl4]2-, [CoCl4]2- and [PtCl4]2-

Defining shape on the basis of the location of X and Z atoms, the total number of species having a square planar shape is

2

Numerical
The total number of lone-pairs of electrons in melamine is

3

### IIT-JEE 2010

Numerical
Based on VSEPR theory, the number of 90 degree F-BR-F angles in BrF5 is

4

### IIT-JEE 1982

Numerical
There are ______ $\pi$ bonds in a nitrogen molecule.