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1

### NEET 2016 Phase 2

MCQ (Single Correct Answer)
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

MCQ (Single Correct Answer)
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

MCQ (Single Correct Answer)
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

MCQ (Single Correct Answer)
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

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NEET

Class 12