CHEM 305 Lecture 2: CHM by S.E.AExam
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1. Give one word/words for the statements given below :
(a) Arrangement of electrons around the nucleus of an atom.
(b) A compound formed by the actual exchange of electrons from the valence shell of a metal to the
valence shell of a non-metal.
(c) An electrostatic bond between a metallic and a non-metallic ion.
(d) A bond formed between two non-metallic elements by mutual sharing of electrons.
(e) A compound in which shared pair of electrons are unequally distributed between the reacting
(f) A compound in which shared pair of electrons are equally distributed between the reacting atoms.
(g) The process due to which an atom or an ion loses an electron/electrons.
(h) The substance which loses an electron or electrons.
(i) Weak electrostatic forces between the molecules of polar covalent compounds.
(j) A chemical reaction in which gain and loss of electrons takes place simultaneously.
2. Choose the correct word/words from the brackets to complete the sentences given below.
(a) In the formation of sodium chloride, the sodium atom loses an electron from its valence shell and
hence is __________ . (oxidised/reduced).
(b) In the formation of magnesium oxide, the magnesium atom loses two electrons from its valence shell
and hence is a _________. (oxidising agent/reducing agent).
(c) In the formation of calcium oxide, the oxygen atom gains two electrons in its valence shell and hence
is ______________ . (oxidised/reduced)
(d) In the formation of sodium sulphide, the sulphur atom gains two electrons in its valence shell and
hence is a ___________ . (oxidising agent/reducing agent)
(e) Higher difference in the value of ______________ between the reacting atoms, leads to the
formation of ionic bond. (electronegativity/electopositivity)
(f) When the participating atoms in a chemical reaction are two __________ a covalent bond is formed.
(g) The ______________ compounds in fused state or aqueous solution are good conductors of
(h) If participating atoms in a chemical reaction are a metal and a non-metal, the compound so formed
has _________boiling point. (higher/lower)
(i) When an atom or an ion loses an electron, it is said to be _________ . (oxidised/reduced).
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