AIEEE 2006 | Structure of Atom Question 180 | Chemistry

Uncertainty in the position of an electron (mass = 9.1 $$\times$$ 10^-31 kg) moving with a velocity 300 ms^-1, accurate upto 0.001% will be (h = 6.63 $$\times$$ 10^-34 Js)

1.92 $$\times$$ 10^-2 m

3.84 $$\times$$ 10^-2 m

19.2 $$\times$$ 10^-2 m

5.76 $$\times$$ 10^-2 m

AIEEE 2006

MCQ (Single Correct Answer)

-1

Which of the following sets of ions represents a collection of isoelectronic species?

N^3-, O^2-, F^-, S^2-

Li⁺, Na⁺, Mg²⁺, Ca²⁺

K⁺, Cl^-, Ca²⁺, Sc³⁺

Ba²⁺, Sr²⁺, K⁺, Ca²⁺

AIEEE 2005

MCQ (Single Correct Answer)

-1

Pick out the isoelectronic structure from the following :

$$\eqalign{ & \left( i \right)\,\,\,\,\,\,C{H_3}^ + \cr & \left( {ii} \right)\,\,\,\,{H_3}{O^ + } \cr & \left( {iii} \right)\,\,\,N{H_3} \cr & \left( {iv} \right)\,\,\,\,C{H_3}^ - \cr} $$

$$(i)$$ and $$(ii)$$

$$(iii)$$ and $$(iv)$$

$$(i)$$ and $$(iii)$$

$$(ii), (iii)$$ and $$(iv)$$

AIEEE 2005

MCQ (Single Correct Answer)

-1

In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields?
(A) n = 1, l = 0, m = 0
(B) n = 2, l = 0, m = 0
(C) n = 2, l = 1, m = 1
(D) n = 3, l = 2, m = 1
(E) n = 3, l = 2, m = 0

(D) and (E)

(B) and (C)

(A) and (B)

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