Chemical Bounding

Q: Which of the following compounds participate in hydrogen bonding?

(a) :  CH3Cl
(b) :  CH3OCH3
(c) :  CH3NH2
(d) :  CH3CH2Cl
(e) :  None of the Above
Answer:  CH3NH2
Explanation:  The very electronegative atoms, F, 0 and N make hydrogen bonding possible. Since CH3Cl and CH3CH2Cl do not contain any of these atom, then the cannot form hydrogen bonding CH3OCH3 contain oxygen atom but it is not directly attached to hydrogen atom therefore it cannot form hydrogen bonding.

Q: Which of the following compounds has most likely been formed by covalent bonding of atom ?

(a) :  CaF2
(b) :  MgO
(c) :  SiH4
(d) :  RbCl
(e) :  None of the Above
Answer:  SiH4
Explanation:  Keeping in mind that covalent bonds are general!y formed between non-metal elements, 13 is correct because the position of silicon and hydrogen in the periodic table indicate a tendency to form covalent bonding. All other compounds are clectrovalently bonded in which the electron needs of the anions are met by the cations.

Q: Which substance has greatest lattice energy ?

(a) :  Kl
(b) :  NaF
(c) :  CuBr
(d) :  MgO
(e) :  None of the Above
Answer:  MgO
Explanation:   Lattice energy is measure of how much stabilization result from packing of oppositely charged ions together in an ionic compound. MgO has greatest lattice energy. MgO is only substance of those listed with charges of positive two (4-2) and negative (-2).

Q: An ionic bond is formed between two ions. Which of the following has no effect on the strength of the bond? (i) Doubling the charge on both ions (ii) Doubling the temperature (iii) Doubling the radii of both ions

(a) :  I Only
(b) :  II Only
(c) :  I and II
(d) :  I, II and III
(e) :  None of the Above
Answer:  II Only
Explanation:  When two ions come together to form an ionic bond, energy is released. The more energy rettased, the stronger the ionic bond. The amount of energy released is determined by E=1.44q1.12/r2

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