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1
AIPMT 2009
MCQ (Single Correct Answer)
Which of the following is not permissible arrangement of electrons in an atom ?
A
n = 5, $$l$$ = 3, m = 0, s = +1/2
B
n = 3, $$l$$ = 2, m = $$-$$ 3, s = $$-$$1/2
C
n = 3, $$l$$ = 2, m = $$-$$ 2, s = $$-$$1/2
D
n = 4, $$l$$ = 0, m = 0, s = $$-$$1/2
CHECK ANSWER
Explanation
In an atom for any value of n, the values of l = 0 to (n-1)
For a given value of l, the values of m
l
= -$$l$$ to 0 to +$$l$$
and the value of s = +1/2 or -1/2
In option(b), l = 2 and m
l
= -3
This is not possible. as for l = 2 min value of m
l
= -2
2
AIPMT 2009
MCQ (Single Correct Answer)
Maximum number of electrons in a subshell of an atom is determined by the following
A
2$$l$$ + 1
B
4$$l$$ $$-$$ 2
C
2n
2
D
4$$l$$ + 2
CHECK ANSWER
Explanation
Maximum number of electrons in a subshell = 2(2l+1) = 4l + 2
3
AIPMT 2008
MCQ (Single Correct Answer)
If uncertainty in position and momentum are equal, then uncertainty in velocity is
A
$${1 \over m}\sqrt {{h \over \pi }} $$
B
$$\sqrt {{h \over \pi }} $$
C
$${1 \over {2m}}\sqrt {{h \over \pi }} $$
D
$$\sqrt {{h \over {2\pi }}} $$
CHECK ANSWER
Explanation
According to Heisenberg uncertainty principle
$$\Delta p.\Delta x \ge {h \over {4\pi }}$$ or m$$\Delta v.\Delta x \ge {h \over {4\pi }}$$
$$ \Rightarrow $$ (m$$\Delta v$$)
2
$$\ge {h \over {4\pi }}$$ ($$ \because $$ $$\Delta x$$ = $$\Delta p$$)
$$ \Rightarrow $$ $$\Delta v \ge$$ $${1 \over {2m}}\sqrt {{h \over \pi }} $$
4
AIPMT 2008
MCQ (Single Correct Answer)
The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1 $$ \times $$ 10
$$-$$18
g cm s
$$-$$1
. The uncertainty in electron velocity is (mass of an electron is 9 $$ \times $$ 10
$$-$$28
g)
A
1 $$ \times $$ 10
5
cm s
$$-$$1
B
1 $$ \times $$ 10
11
cm s
$$-$$1
C
1 $$ \times $$ 10
9
cm s
$$-$$1
D
1 $$ \times $$ 10
6
cm s
$$-$$1
CHECK ANSWER
Explanation
$$\Delta v$$ = $${{1 \times {{10}^{ - 18}}} \over {9 \times {{10}^{ - 28}}}} = 1.1 \times {10^9}cm\,{s^{ - 1}}$$
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Questions Asked from Structure of Atom
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Chapters Map
Physical Chemistry
Gaseous State
Solid State
Surface Chemistry
Nuclear Chemistry
Some Basic Concepts of Chemistry
Thermodynamics
Solutions
Electrochemistry
Chemical Kinetics
Structure of Atom
Equilibrium
Redox Reactions
Inorganic Chemistry
s-Block Elements
p-Block Elements
Coordination Compounds
Periodic Table and Periodicity
Processes of Isolation of Elements
d and f Block Elements
Environmental Chemistry
Chemical Bonding and Molecular Structure
Hydrogen
Organic Chemistry
Alcohol, Phenols and Ethers
Hydrocarbons
Chemistry in Everyday Life
Haloalkanes and Haloarenes
Organic Compounds Containing Nitrogen
Biomolecules
Polymers
Some Basic Concepts of Organic Chemistry
Aldehydes, Ketones and Carboxylic Acids
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