﻿ Which of the following transitions haveminimum wavelengths ? from Chemistry NEET Year 2006 Free Solved Previous Year Papers

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# NEET Chemistry Solved Question Paper 2006

#### Multiple Choice Questions

1.

For an electron , if the uncertainty in velocity is$∆$v ,the uncertainty in its position ($∆$x) is given by :

• $\frac{\mathrm{hm}}{4\mathrm{\pi }∆\mathrm{\nu }}$

• $\frac{4\mathrm{\pi }}{\mathrm{hm}∆\mathrm{\nu }}$

• $\frac{\mathrm{h}}{4\mathrm{\pi m}∆\mathrm{v}}$

• $\frac{4\mathrm{\pi m}}{\mathrm{h}∆\mathrm{\nu }}$

C.

$\frac{\mathrm{h}}{4\mathrm{\pi m}∆\mathrm{v}}$

For an electron , if the uncertainty in velocity is$∆$v ,the uncertainty in its position ($∆$x) is given by :

2.

Equation of Boyle's law is :

• $\frac{\mathrm{dP}}{\mathrm{P}}$ = -$\frac{\mathrm{dV}}{\mathrm{V}}$

• $\frac{\mathrm{dP}}{\mathrm{P}}$ = +$\frac{\mathrm{dV}}{\mathrm{V}}$

• $\frac{{\mathrm{d}}^{2}\mathrm{P}}{\mathrm{P}}$ = -$\frac{\mathrm{dV}}{\mathrm{dT}}$

• $\frac{{\mathrm{d}}^{2}\mathrm{P}}{\mathrm{P}}$ = +$\frac{{\mathrm{d}}^{2}\mathrm{V}}{\mathrm{dT}}$

A.

$\frac{\mathrm{dP}}{\mathrm{P}}$ = -$\frac{\mathrm{dV}}{\mathrm{V}}$

Equation of Boyle's law is :

3.

Ionic compounds are formed most easily with :

• low electron affinity , high ionisation energy

• high electron affinity , low ionisation energy

• low electron affinity , low ionisation energy

• high electron affinity , high ionisation energy

B.

high electron affinity , low ionisation energy

Ionic compounds are formed most easily with :

4.

Orbital is :

• circular path around the nucleus in which the electrons revolves

• space around the nucleus where the probability of finding the electron is maximum

• amplitude of electron wave

• none of the above

B.

space around the nucleus where the probability of finding the electron is maximum

Orbital is :

5.

A metal surface is exposed to solar radiations :

• the emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations

• the emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiations

• the emitted electrons have zero energy

• the emitted electrons have energy equal to energy of photons of incident light

A.

the emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations

A metal surface is exposed to solar radiations :

6.

Which of the following sequence is correct as perAufbau principle ?

• 3s < 3d < 4s < 4p

• ls < 2p < 4s < 3d

• 2s < 5s < 4p < 5d

• 2s < 5s < 4p < 5f

B.

ls < 2p < 4s < 3d

Which of the following sequence is correct as perAufbau principle ?

# 7.Which of the following transitions haveminimum wavelengths ?n4 $\to$ n1 n2 $\to$ n1 n4 $\to$ n2 n3 $\to$ n1

A.

n4 $\to$ n1

Which of the following transitions haveminimum wavelengths ?

8.

The Ksp of Mg(OH)2 is 1 x 10-12 , 0.01 M Mg(OH)2will precipitate at the limited pH :

• 3

• 9

• 5

• 8

B.

9

The Ksp of Mg(OH)2 is 1 x 10-12 , 0.01 M Mg(OH)2will precipitate at the limited pH :

9.

The enthalpy change ($∆$H) for the neutralisationof M HCl by caustic potash in dilute solution at298 K is :

• 68 kJ

• 65 kJ

• 57.3 kJ

• 50 kJ

C.

57.3 kJ

The enthalpy change ($∆$H) for the neutralisationof M HCl by caustic potash in dilute solution at298 K is :

10.

A radioactive sample is emitting 64 timesradiations than non-hazardous limit .If itshalf-life is 2 hours , after what time it becomesnon- hazardous ?

• 16 h

• 10 h

• 12 h

• 8 h

C.

12 h

A radioactive sample is emitting 64 timesradiations than non-hazardous limit .If itshalf-life is 2 hours , after what time it becomesnon- hazardous ?