Application of Concepts
Explain the formation of sodium chloride and calcium oxide on the basis of the concept of electron transfer from one atom to another atom.
A, B, and C are three elements with atomic numbers 6, 11 and 17 respectively.
i. Which of these cannot form ionic bond? Why?
ii. Which of these cannot form covalent bond? Why?
iii. Which of these can form ionic as well as covalent bonds?
Predict the reasons for low melting point for covalent compounds when compared with ionic compound
How Lewis dot structure helps in understanding bond formation between atoms?
Explain the formation of the following molecules using valence bond theory
a) N
2
molecule b) O
2
molecule
Higher Order Thinking questions
1. Two chemical reactions are described below.
• Nitrogen and hydrogen react to form ammonia.
• Carbon and hydrogen bond together to form a molecule of methane.
For each reaction, give:
(a) The valence of each of the atoms involved in the reaction.
(b) The Lewis structure of the product that is formed.
Multiple choies questions
1) Which one of the following four elements is more electronegative? [ ]
a) Sodium b) Oxygen c) Magnesium d) Calcium
2) An element 11X23 forms an ionic compound with another element ‘Y’. Then the charge on the ion formed by X is [ ]
a) +1 b) +2 c) -1 d) -2
3) An element ‘A’ forms a chloride ACl [ ]
The number electrons in the valence shell of ‘A’ is
a) 1 b) 2 c) 3 d) 4
4) The inert gas element which does not have octet electronic configuration in its outermost orbit is
a) Helium b) Argon c) Krepton d) Radon
5) Number of covalent bonds in methane molecule
a) 1 b) 2 c) 3 d) 4
6) The concept hybridisation of orbitals of an atoms was introdused by
a) Lives pouling b) Mosley c) Lewis d) Kossel
7) The value of bond angle in Berileum chloride molecule is
a) 1800 b) 1200 c) 1100 d) 104.310
Suggested Projects
1. Collect the information about properties and uses of covalent compounds and prepare a report?
page no:175
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