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1

### 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 = $$\sqrt {6}h$$
2

### 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
3

### AIPMT 2015 Cancelled Paper

The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following ?
A
d-electrons in Fe (Z = 26)
B
p-electrons in Ne (Z = 10)
C
s-electrons in Mg (Z = 12)
D
p-electrons in Cl(Z = 17)

## Explanation

Number of d-electrons in Fe2+ = 6

Number of p-electrons in Cl = 11
4

### AIPMT 2014

Be2+ is isoelectronic with which of the following ions ?
A
H+
B
Li+
C
Na+
D
Mg2+

## Explanation

Be2+ has 2 electrons and also Li+ has 2 electrons so Be2+ and Li+ are isoelectronic

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