Covalent Bonding MCQs

A covalent bond is created when two atoms share electrons mutually. When atoms with different electronegativities form covalent bonds, these bonds often have partial ionic character. Covalency refers to the number of electron pairs shared between atoms in a covalent compound. In covalent solids, the molecules are held together by weak Van der Waals forces, resulting in low melting and boiling points. These compounds do not conduct electricity in either their molten state or aqueous solutions due to the absence of ions or free electrons, making them nonelectrolytes. Additionally, because covalent bonds are directional, covalent compounds can exhibit stereoisomerism.

The nature of bonding in CCl4 and CaH2 is

(a) electrovalent in both CCl4 and CaH2
(b) covalent in CCl4 and electrovalent in CaH2
(c) electrovalent in CCl4 and covalent in CaH2
(d) covalent in both CCl4 and CaH2

The octet rule is not valid for the molecule

(a) CO2
(b) H2O
(c) O2
(d) CO

The self-linking ability of carbon is called

(a) catenation
(b) sublimation
(c) hydrogenation
(d) carbonation

By applying a Silver Nitrate solution to pure carbon tetrachloride

(a) a white precipitate soluble in ammonia is obtained
(b) a curdy precipitate insoluble in ammonia is obtained
(c) a pale yellow precipitate is obtained
(d) no precipitate is obtained

CCl4 is insoluble in water because

(a) CCl4 is nonpolar and water is polar
(b) water is nonpolar and CCl4 is polar
(c) water and CCl4 are both polar
(d) none

Almost 95% of compounds are of carbon because they can form

(a) single bonds
(b) double bonds
(c) triple bonds
(d) multiple bonds

A solid substance is soft, has a low melting point, and is a poor conductor of electricity. The substance is most likely

(a) an ionic solid
(b) network solid
(c) a metallic solid
(d) a molecular solid

Which is not an exception to the octet rule?

(a) BF3
(b) SnCl4
(c) BeI2
(d) ClO2

The rate of reaction of organic compounds is slow due to

(a) ionic bonding
(b) amphoteric nature
(c) covalent bonding
(d) coordinate covalent bonding

The compound with the lowest melting point is

(a) AlF3
(b) AlCl3
(c) AlBr3
(d) AlI3