﻿ Ionic compounds are formed most easily with : 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 :

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

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

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

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

2.

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

• 3

• 9

• 5

• 8

3.

Equation of Boyle's law is :

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

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

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

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

4.

A radioactive sample is emitting 64 times radiations than non-hazardous limit .If its half-life is 2 hours , after what time it becomes non- hazardous ?

• 16 h

• 10 h

• 12 h

• 8 h

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

6.

Which of the following transitions have minimum wavelengths ?

• n4 $\to$ n1

• n2 $\to$ n1

• n4 $\to$ n2

• n3 $\to$ n1

7.

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

8.

Which of the following sequence is correct as per Aufbau principle ?

• 3s < 3d < 4s < 4p

• ls < 2p < 4s < 3d

• 2s < 5s < 4p < 5d

• 2s < 5s < 4p < 5f

9.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

An ionic bond is formed between an electropositive metal and a electronegative non metal .The electropositive metal converts into a cation , while the electronegative non metal converts into a anion .

Thus the formation ofionic bond is favoured by

(I) Low ionisation potential of metal

(II) Greater valtie of electron affinity of non metal

(III) Higher value of lattice energy of the resulting ionic compound .

10.

The enthalpy change ($∆$H) for the neutralisation of M HCl by caustic potash in dilute solution at 298 K is :

• 68 kJ

• 65 kJ

• 57.3 kJ

• 50 kJ