Chemical Bounding

Q: In which substance is each carbon atom covalently bonded to only three other atoms ?

(a) :  Carbon dioxide
(b) :  Diamond
(c) :  Graphite
(d) :  Methane
(e) :  None of the Above
Answer:  Graphite
Explanation:  The carbon atom in graphite is covalently bonded together in hexagons, which arc arranged in layers. The bonding between the layers of carbon atoms is very weak and there are delocalind electrons between the Layers to conduct electric current.

Q: Which one of the following characteristics is not usually attributable to ionic substance ?

(a) :  High melting point
(b) :  Deform when struck
(c) :  Fragility
(d) :  Three dimensional structure
(e) :  None of the Above
Answer:  Deform when struck
Explanation:  Ionic substances have electrostatic bonds which are stronger than van der Waals forces found in atomic and molecular substances. They have all properties fisted above except for deform when struck,

Q: Which statement is not true for the reaction? Fe2+ + e- → Fe+2

(a) :  Fe+3 is being reduced
(b) :  Oxidation state of Fe has changed
(c) :  Fe+3 could be referred to as an oxidizing agent in this reaction
(d) :  Both Fe+3 and Fe+2 called anions
(e) :  None of the Above
Answer:  Both Fe+3 and Fe+2 called anions
Explanation:  Fe+3 and Fe+2 are actually cations not anions. Other all choice A, B, C are true.

Q: Layers of carbon atom in graphite are held by:

(a) :  Vander Waal's force
(b) :  Free electrons
(c) :  Double bond
(d) :  Covalent bond
(e) :  None of the Above
Answer:  Vander Waal's force
Explanation:  Van der Waals forces exist between the layers of carbon atom in graphite together.

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