Advance Concepts Chemistry

Q: A 3p orbital has:

(a) :  Two non-spherical nodes
(b) :  Two spherical nodes
(c) :  One spherical node and one non-sperical node
(d) :  Two spherical nodes and one non-spherical node
(e) :  None of the Above
Answer:  One spherical node and one non-sperical node
Explanation:  Anorbital with quantum number n=3 has (n-1)=2 nodes.A p-orbital has one non-spherical node,therefore the 3p orbital has one spherical and one non-spherical node.

Q: The most electronegative element is:

(a) :  K
(b) :  Li
(c) :  Na
(d) :  Rb
(e) :  None of the Above
Answer:  Li
Explanation:  Electronegativity decreases as we descend this group, the smaller atoms of Li would more readily accept an electron than the larger atoms of cesium.

Q: How many valence electrons does an carbon (C) have?

(a) :  12
(b) :  6
(c) :  4
(d) :  2
(e) :  None of the Above
Answer:  12
Explanation:  

Q: All of the following are product of the electrolysis of an aqueous potassium iodine solution or the reaction of products with water except:

(a) :  H₂
(b) :  I₂
(c) :  K
(d) :  KOI
(e) :  None of the Above
Answer:  KOI
Explanation:  The reaction proceeds as 2I-" I2 + 2e- At anode K+ + e- " K At cathode 2K + 2H2O "2KOH +H2

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