MCQs on Covalent Bonding

A covalent bond is formed by mutual sharing of electrons between two atoms. Covalent bonds formed between two atoms having differences in their electronegativities have partial ionic character. Covalency is the number of electron pairs shared by atoms in the formation of a covalent compound. The molecules present in a covalent solid are attracted by weak Van der Waals forces. So they have low melting points and boiling points. Covalent compounds do not conduct electric current either in molten state or in their aqueous solutions because of the absence of ions or free electrons. Covalent compounds are nonelectrolytes. Covalent bonds are directional in nature hence covalent compounds exhibit stereoisomerism.

1. The octet rule is not valid for the molecule

1. CO₂
2. H₂O
3. O₂
4. CO

Answer: (d)

2. The nature of bonding in CCl₄ and CaH₂ is

1. electrovalent in both CCl₄ and CaH₂
2. covalent in CCl₄ and electrovalent in CaH₂
3. electrovalent in CCl₄ and covalent in CaH₂
4. covalent in both CCl₄ and CaH₂

Answer: (b)

3. CCl₄ is insoluble in water because

1. CCl₄ is nonpolar and water is polar
2. water is nonpolar and CCl₄ is polar
3. water and CCl₄ are both polar
4. none

Answer: (a)

4. Which is not an exception to octet rule?

1. BF₃
2. SnCl₄
3. BeI₂
4. ClO₂

Answer: (b)

5. The compound with the lowest melting point is

1. AlF₃
2. AlCl₃
3. AlBr₃
4. AlI₃

Answer: (d)

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

1. an ionic solid
2. network solid
3. a metallic solid
4. a molecular solid

Answer: (d)

7. By applying a Silver Nitrate solution to pure carbon tetrachloride

1. a white precipitate soluble in ammonia is obtained
2. a curdy precipitate insoluble in ammonia is obtained
3. a pale yellow precipitate is obtained
4. no precipitate is obtained

Answer: (d)

8. The rate of reaction of organic compounds is slow due to

1. ionic bonding
2. amphoteric nature
3. covalent bonding
4. coordinate covalent bonding

Answer: (c)

9. The self linking ability of carbon is called

1. catenation
2. sublimation
3. hydrogenation
4. carbonation

Answer: (a)

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

1. single bonds
2. double bonds
3. triple bonds
4. multiple bonds

Answer: (d)

Further reading:

• NEET Chemistry Syllabus
• Chemistry Formulas for NEET
• How to Score 160 Plus in NEET Chemistry
• NEET Chemistry Important Topics
• NEET Chemistry MCQs
• NEET Chemistry Weightage

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