1

IIT-JEE 1998

MCQ (More than One Correct Answer)
Which of the following statement(s) is (are) correct?
A
The electronic configuration of Cr is [Ar] 3d54s1.(Atomic number of Cr = 24)
B
The magnetic quantum number may have negative value
C
In silver atom, 23 electrons have a spin of one type and 24 of the opposite type. (Atomic number of Ag = 47)
D
The oxidation state of Nitrogen in HN3 is -3
2

IIT-JEE 1998

MCQ (More than One Correct Answer)
Decrease in atomic number is observed during
A
alpha emission
B
beta amission
C
positron emisson
D
electron capture
3

IIT-JEE 1986

MCQ (More than One Correct Answer)
The sum of the number of neutrons and proton in the isotope of hydrogen is
A
6
B
2
C
4
D
3
4

IIT-JEE 1984

MCQ (More than One Correct Answer)
Many elements have non-integral atomic masses because:
A
they have isotopes
B
their isotopes have non-integral masses
C
their isotopes have different masses
D
the constitutents, neutrons, protons and electrons combine to give fractional masses

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