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NEET Chemistry MCQ
Structure Of Atom Mcq Neet Chemistry
Quiz 11
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Q.1
The number of d-electrons in Fe2+ ( Z=26) is not equal to that of the
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a) p-electrons in Ne ( at. no.=10)
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b) s-electrons in Mg 9 at no=12)
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c) d-electrons in Fe
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d) p-electrons in Cl- ( at no of Cl=17)
Explanation
26Fe=[Ar] 3d6 4s2 Fe2+=[Ar] 3d6d electron=6, p-electrons in Cl-=12 Answer: (d)
Q.2
The electron configuration of P in H3PO4 is
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a) 1s2 2s2 2p6 3s2 3p3
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b) 1s2 2s2 2p6 3s2
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c) 1s2 2s2 2p6
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d) 1s2 2s2 2p6 3s2 3p6 4s1
Explanation
Oxidation state of P in H3PO415 P=1s2 2s2 2p63s2 3p3P+5=1s2 2s2 2p6 Answer: (c)
Q.3
Which of the following has sp3 hybridisation? [ DEC 2001]
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a) BBr3
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b) XeF4
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c)BCl3
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d)XeO3
Explanation
Answer: (d)
Q.4
In a ground state of Cu+, the number of shells occupied, subshells occupied, filled orbitals and unpaired electrons respectively are
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a) 4, 8, 15, 0
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b) 3, 6, 15, 1
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c)3, 6, 14, 0
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d)4, 7, 14, 2
Explanation
Cu+=1s2 , 2s2 , 2p6, 3s2, 3p63d10 Answer:(c)
Q.5
Which of the following has non-spherical shell of electron?
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a) He
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b) B
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c) Be
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d) Li
Explanation
B has 2p shell which is not spherical Answer: (b)
Q.6
An isotone of 76 Ge32 is
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a) 77Ge32
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b) 77As33
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c) 77Se34
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d) 78Se74
Explanation
Isotone means same number of neutrons Number of neutrons = Mass number = Atomic number Number of neutron in Ge = 76 – 32 = 44 Number of neutron in As = 77 – 33 = 44 Answer: (b)
0 h : 0 m : 1 s
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