AIEEE 2004 | Structure of Atom Question 178 | Chemistry

Which one of the following sets of ions represents the collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

K⁺, Cl^-, Mg²⁺, Sc³⁺

Na⁺, Ca²⁺, Sc³⁺, F^-

K⁺, Ca²⁺, Sc³⁺, Cl^-

Na⁺, Mg²⁺, Al³⁺, Cl^-

AIEEE 2003

MCQ (Single Correct Answer)

-1

Which one of the following groupings represents a collection of isoelectronic species? (At. nos. : Cs : 55, Br : 35)

N^3-, F^-, Na⁺

Be, Al³⁺, Cl^-

Ca²⁺, Cs⁺, Br

Na⁺, Ca²⁺, Mg²⁺

AIEEE 2003

MCQ (Single Correct Answer)

-1

The orbital angular momentum for an electron revolving in an orbit is given by $$\sqrt {l(l + 1)} {h \over {2\pi }}$$. This momentum for an s-electron will be given by

zero

$${h \over {2\pi }}$$

$$\sqrt 2 {h \over {2\pi }}$$

$$ + {1 \over 2}{h \over {2\pi }}$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 meters per second is approximately

10^-31 meters

10^-16 meters

10^-25 meters

10^-33 meters