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ETOOS ACADEMY Pvt. Ltd

F-106, Road No.2 Indraprastha Industrial Area, End of Evergreen Motor,

BSNL Lane, Jhalawar Road, Kota, Rajasthan (324005) Tel. : +91-744-242-5022, 92-14-233303

CHEMISTRYDAILY PRACTICE PROBLEMS

D P PCOURSE NAME : URJAA (UR) DATE : 08.07.2013 to 13.07.2013 DPP NO. 07 TO 08

TARGET

JEE (ADVANCED) : 2014

* Marked Questions are having more than one correct option.

DPP No. # 071. Calculate ratio of de-Broglie wavelength for an proton and !-particle, if they are accelerated through

same potential difference V.

2. Calculate ratio of de-Broglie wavelength for a proton and !-particle, if their kinetic energies are same.

3. Calculate the uncertainty in the velocity of a cricket ball having a mass 150 g, if the uncertainty in

its position is the order of 1  Å :(A) 3.50 × 10 –24  ms –1 (B) 7.20 × 10 –24  ms –1

(C) 9.30 × 10 –22  ms –1 (D) None of these

4. The uncertainties in measurement of position and momentum of an electron are equal. Choose the

correct statement : (Given18h

7.2 104

"# $

%)

(A) The uncertainty in measurement of speed = 8 × 1013  m/sec.

(B) The uncertainty in measurement of kinetic energy = h / 8%m.

(C) The uncertainty in measurement of speed = 8 × 1016  m/sec

(D) Increasing the wavelength of light used in the experiment will decrease uncertainty in position and

increase the uncertainty in momentum.

5. If the light of wavelength 3 × 10 –10 cm is used in used to detect an electron, then the uncertainty in

velocity will be : (h = 6.6 × 10 –

34  Js, me  = 9.1 × 10 –

31  kg).(A) 106  m/s (B) 2 × 106 m/s (C) 2 × 107  m/s (D) 107  m/s

6. If numerical value of mass and velocity are equal for a particle, then its de-Broglie wavelength in

terms of K.E. is :

(A)mh

2K.E.(B)

h

2m2K.E.(C) both are correct (D) none is correct

7. The orbital angular momentum corresponding to n = 4 and m =  –  3 is :

(A) 0 (B)h

2%(C)

6 h

2%(D)

3 h

%

8. Spin magnetic moment of xn+ (Z = 26) is 24  B.M. Hence number of unpaired electrons and value

of n respectively are :

(A) 4, 2 (B) 2, 4 (C) 3, 1 (D) 0, 2

9. Spin magnetic moments of V (Z = 23), Cr (Z = 24), Mn (Z = 25) are x, y, z respectively. Hence :

(A) x = y = z (B) x < y < z (C) x < z < y (D) z < y < x

10. Calculate :

(a) the value of spin only magnetic moment of Co3+  ion (in BM).

(b) the number of radial nodes in 3p-orbital

(c) the number of electrons with (m = 0) in Mn2+  ion.

(d) the orbital angular momentum for the unpaired electron in V4+.

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ETOOS ACADEMY Pvt. Ltd

F-106, Road No.2 Indraprastha Industrial Area, End of Evergreen Motor,

BSNL Lane, Jhalawar Road, Kota, Rajasthan (324005) Tel. : +91-744-242-5022, 92-14-233303

DPP No. # 081. A d-block element has total spin value of + 3 or  –  3. Then, the spin only magnetic moment of the element

is approximately :

(A) 2.83 B.M. (B) 3.87 B.M. (C) 5.9 B.M. (D) 6.93 B.M.

2. Spin only magnetic moment of 25Mnx+  ion is 15 B.M. . Then, the value of x is :

(A) 1 (B) 2 (C) 3 (D) 4

3. Spin only magnetic moment of26

Fe2+  ion is same as :

(A) 26Fe (B) 24Cr2+ (C) 28Ni4+ (D) All of these

4. Orbital angular momentum of an electron ish

3%

. Then, the number of orientations of this orbital

in space are :

(A) 3 (B) 5 (C) 7 (D) 9

5. The correct order of the magnetic moment of [25Mn4+, 24Cr3+, 24Fe3+] is :

(A) Fe3+ > Cr3+  = Mn4+ (B) Fe3+  > Cr3+  > Mn4+

(C) Cr3+  = Mn4+  > Fe3+ (D) Fe3+  > Mn4+  > Cr3+

6. What is the maximum possible number of electrons in an atom with (n + l  = 7) ?

7. Predict total spin for each configuration :

(a) 1s2 (b) 1s2  2s2  2p6 (c) 1s2  2s2  2p5

(d) 1s2  2s2  2p3 (e) 1s2  2s2  2p6  3s2  3p6  3d5  4s2

8. In the following electronic configuration, some rules have been violated :

4p4

4s1

3d5

I : Hund II : Pauli's exclusion III. Aufbau

(A) I and II (B) I and III (C) II and III (D) I, II and III9. What is the potential difference through which an electron, with a de Broglie wavelength of 1.5  Å,

should be accelerated, if its de Broglie wavelength has to be reduced to 1  Å :(A) 110 volts (B) 70 volts (C) 83 volts (D) 55 volts

10. A neutral atom of an element has 2 K, 8L, 9M and 2N electrons. Find out the following :

(a) Atomic number of element (b) Total number of s electrons

(c) Total number of p electrons (d) Total number of d electrons

(e) Valency of element (f) Number of unpaired electrons in element

ANSWER KEY

DPP No. # 07

1.p 2 2

1!

&#

&2.

p 2

1!

&#

&3. (A) 4. (B) 5. (C) 6. (A)

7. (D) 8. (A) 9. (C)

10. (a) 24  or 4.9 BM (b) 1 (c) 11 (d)6h

2%

DPP No. # 081. (D) 2. (D) 3. (D) 4. (C) 5. (A) 6. 32

7. (a) 0 × (± 1/2) = 0 (b) 0 × (± 1/2) = 0 (c) 1 × (± 1/2)(d) 3 × (± 1/2) = ± 3/2 (e) 5 × (± 1/2) = ± 5/2

8. (C) 9. (C)

10. (a) 21 (b) 8 (c) 12 (d) 1 (e) + 2, + 3 (f) 1