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Chemistry Past Questions and Answers

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Chemistry Questions

Question 2646:

Elements which belong to the same group in the Periodic Table are characterized by

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A Difference of +1 in the oxidation numbers of successive members
B Presence of the same number of outermost electrons in the respective atoms
C Difference of 14 atomic mass units between successive members
D Presence of the same number of electron shells in the respective atoms

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Question 2647:

The atom of an element X combines with aluminium (<sub style='font-size: smaller;'>13</sub>AI)?

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A AIX <sub style='font-size: smaller;'>2</sub>
B AI <sub style='font-size: smaller;'>2</sub>X
C AI<sub style='font-size: smaller;'>2</sub>X <sub style='font-size: smaller;'>2</sub>
D AI <sub style='font-size: smaller;'>2</sub>X <sub style='font-size: smaller;'>3</sub>

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Question 2648:

The presence of unpaired electrons in an atom of a transition metal gives rise to

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A Paramagnetism
B Nalleability
C Ductility
D Shiny appearance

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Question 2649:

What is responsible for metallic bonding?

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A Sharing of electrons between the metal atoms
B Attraction between the atomic unclei and cloud of electrons
C Transfer of electrons from one atom to another
D Attraction between positive and negative ions

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Question 2650:

Which of the following compounds is covalent?

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A CaCI<sub style='font-size: smaller;'>2</sub>
B MgO
C NaN
D CH<sub style='font-size: smaller;'>4</sub>

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