For a molecule with the formula AB_2 the molecular geometry is ____ A) linear or

Question

For a molecule with the formula AB_2 the molecular geometry is ____ A) linear or bent B) linear or trigonal planar C) linear or T-shaped D) T-shaped E) trigonal planar The electronegativity is 2.1 for Hand 1.9 for Pb. Based on these electronegativities PbH_4 would be expected to A) be ionic and contain H^- ions. B) be ionic and contain H^+ ions. C) have polar covalent bonds with a partial negative charges on the H atoms. D) have polar covalent bonds with a partial positive charges on the H atoms. How many unpaired electrons are there in an O^2- ion? A) 0 B) 1 C) 2 D) 3 E) 6 In the nitrite ion, NO^-2, ____. A) both bonds are single bonds B) both bonds are double bonds C) one bond is a double bond and the other is a single bond D) both bonds are longer than a double bond and shorter than a single bond E) there are 20 valence electrons Which of the following statements is TRUE? A) A covalent bond is formed through the transfer of electrons from one atom to another. B) A pair of electrons involved in a covalent bond is sometimes referred to as a "lone pair." C) It is not possible for two atoms to share more than two electrons. D) Single bonds are shorter than double bonds. E) A covalent bond has a lower potential energy than the two separate atoms. Identify the number of bonding pairs and lone pairs of electrons in water. A) 1 bonding pair and 1 lone pair B) 1 bonding pair and 2 lone pairs C) 2 bonding pairs and 2 lone pairs D) 2 bonding pairs and 1 lone pair E) 3 bonding pairs and 2 lone pairs

Explanation / Answer

For a molecule with molecular formula AB2

it will be either linear or bent

if it is without lone pair it will be Linear with bond angle 180

B --- A --- B

if it is with lone pair it will be Bent with bond angle 109.5

2)

have polar covalent bond with partial negative charge on H atom

as electronegativities of both atom are equal they will form polar bond instead of

ionic bond which will form only if differnece in electronegativity is more than 0.5

here Hydrogen atom having higher electronegativity it will attract more electrons towards itself so it will be partially negative

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