1
MCQ (Single Correct Answer)

AIPMT 2001

Main axis of a diatomic molecule is z, molecular orbital px and py overlap to from which of the following orbitals.
A
$$\pi $$ molecular orbital
B
$$\sigma $$ molecular orbital
C
$$\delta $$ molecular orbital
D
No bond will form

Explanation

For $$\pi $$ overlap, the lobes of the atomic orbitals are perpendicularto the line joining the nuclei.

Hence only sidewise overlapping takes place.
2
MCQ (Single Correct Answer)

AIPMT 2000

Isoelectronic species are
A
CO, CN$$-$$, NO+, C$${_2^{2 - }}$$
B
CO$$-$$, CN, NO,
C
$$C_2^ - $$
D
CO, CN, NO, C2

Explanation

No. of electrons CO = CN- = NO+ = $$C_2^{2 - }$$ = 14, So these are isoelectronics.
3
MCQ (Single Correct Answer)

AIPMT 2000

For given energy, E = 3.03 $$ \times $$ 10$$-$$19 Joules corresponding wavelength is (h = 6.626 $$ \times $$ 10$$-$$34 J sec, c = 3 $$ \times $$ 108 m/sec)
A
65.6 nm
B
6.56 nm
C
3.4 nm
D
656 nm

Explanation

E = $${{hc} \over \lambda }$$

$$ \Rightarrow \lambda $$ = $${{6.6 \times {{10}^{ - 34}} \times 3 \times {{10}^8}} \over {3.03 \times {{10}^{ - 19}}}}$$

= 656 nm

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