1
MCQ (Single Correct Answer)

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
MCQ (Single Correct Answer)

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
3
MCQ (Single Correct Answer)

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
4
MCQ (Single Correct Answer)

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

EXAM MAP

Joint Entrance Examination

JEE Advanced JEE Main

Medical

NEET

Graduate Aptitude Test in Engineering

GATE CE GATE ECE GATE ME GATE IN GATE EE GATE CSE GATE PI