1. Which of the following statments is true re an inonic bond in MgO? a. Forming

Question

1. Which of the following statments is true re an inonic bond in MgO?

a. Forming an ionic bond between Mg2+ and O2- requires energy.

b. Magnesium atoms gain electrons and oxygen atoms lose electrons.

c. The ionic radius of an oxide ion is greater than its atomic radius.

d. none of the above.

2. Which of the following statements is true regarding a covalent bond in HCl?

a. Breaking the bond between H-Cl requires energy.

b. The bond length is equal to the sum of two atomic radii.

c. Valence electrons are transferred to the chlorine atom.

d. all of the above.

e. none of the above.

3. What is the electron pair geometry for a phoshine molecule, PH3?

a. bent

b. linear

c. tetrahedral

d. trigonal pyramidal

e. none of the above

Explanation / Answer

1. The correct option is C i.e. The ionic radius of an oxide ion is greater than its atomic radius.

The anion of any atom has larger size than its neutral atom because as the number of electron increases it is difficult for nucleus to pull the electrons closer and the size increases.

(Magnesium loses 2 electron and oxygen gains 2 electrons so B cannot be true. Also, forming of MgO bonds release energy)

2. The true statement is A i.e. Breaking the bond between H-Cl requires energy.

To break any bond, energy is required.

(C cannot be true because the electrons are shared, not transfered. Also the bond length is less than sum of atomic radii of H and Cl )

3. Option C is correct. Electron geometry of PH3 is tetrahedral

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