Which of the following is a characteristic of covalent compounds? MCQ with Answer and Explanation

Which of the following is a characteristic of covalent compounds?
A. Good conductors of electricity
B. High melting and boiling points
C. Low melting and boiling points
D. Soluble in water
Answer: Option C
Solution (By JKSSB Mock Tests)
Covalent compounds generally have low melting and boiling points because the intermolecular forces (van der Waals forces) holding the molecules together are relatively weak compared to the strong ionic bonds in ionic compounds. They are also generally poor conductors of electricity as they lack free ions.

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Practice More chemistry Questions

Question #1
A solution turns phenolphthalein pink. Which of the following could it be?
A. Lemon juice
B. Vinegar
C. Soap solution
D. Hydrochloric acid

Correct Answer: Option C


Explanation:
Soap solution is basic, pH > 8.3, so it turns phenolphthalein pink. Lemon juice (citric acid) and vinegar (acetic acid) are acidic, pH < 7, phenolphthalein remains colorless. Hydrochloric acid is strongly acidic, colorless. Phenolphthalein indicator is colorless in acidic and neutral, pink in alkaline solutions. It is used in titrations.

This question belongs to: Science chemistry
Question #2
A solution turns red litmus blue. Its pH is likely:
A. 9
B. 5
C. 2
D. 7

Correct Answer: Option A


Explanation:
A solution turning red litmus blue is basic, so pH > 7. Among options, pH 9 is basic. pH 2 and 5 are acidic (blue litmus turns red). pH 7 is neutral. Litmus is a natural indicator extracted from lichens. Red litmus in base remains blue, blue litmus in acid turns red. Practical: Phenolphthalein gives pink in basic solution (pH > 8.3).

This question belongs to: Science chemistry
Question #3
Identify the correct statement regarding the physical properties of matter.
A. Gases have the highest density among the three states.
B. Solids have the maximum intermolecular space.
C. Gases cannot be compressed.
D. Liquids have a definite volume but no definite shape.

Correct Answer: Option D


Explanation:
Liquids have a definite volume but take the shape of their container. Solids have the least intermolecular space and highest density. Gases have maximum intermolecular space and are highly compressible. This relates directly to the kinetic theory of matter, which describes particle arrangement and movement in different states.

This question belongs to: Science chemistry