1

### NEET 2016 Phase 2

Which of the following pairs of d-orbitals will have electron density along the axes ?
A
${d_{{z^2}}},\,\,{d_{xz}}$
B
dxz,  ${d_{yz}}$
C
${d_{{z^2}}},\,\,{d_{{x^2} - {y^2}}}$
D
${d_{xy}},\,{d_{{x^2} - {y^2}}}$

## Explanation

dx2 - y2 and dz2 orbitals have electron density along the axes.
2

### NEET 2016 Phase 2

How many electrons can fit in the orbital for which n = 3 and $l$ = 1?
A
2
B
6
C
10
D
14

## Explanation

For n = 3 and l = 1, the subshell is 3p and a particular 3p orbital can accodomodate only 2 electrons.
3

### AIPMT 2015 Cancelled Paper

The angular momentum of electron in 'd' orbital is equal to
A
$2\sqrt 3 h$
B
0 $\hbar$
C
$\sqrt 6 \,\hbar$
D
$\sqrt 2 \,\hbar$

## Explanation

We know Anglular momentum = $\sqrt {l(l + 1)}h$

For d obtial l = 2

$\therefore$ Angular momentum = $\sqrt {6}h$
4

### AIPMT 2015

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium ? (At. no. Z = 22)
A
4s 3s 3p 3d
B
3s 3p 3d 4s
C
3s 3p 4s 3d
D
3s 4s 3p 3d

## Explanation

Ti (22) $\Rightarrow$ 1s2 2s2 2p6 3s2 3p6 4s2 3d2

$\therefore$ Order of increasing energy is 3s, 3p, 4s, 3d