The force that holds atoms together in a molecule is called: MCQ with Answer and Explanation

The force that holds atoms together in a molecule is called:
A. Chemical bond
B. Magnetic force
C. Nuclear force
D. Gravitational force
Answer: Option A
Solution (By JKSSB Mock Tests)
Chemical bonds are attractive forces between atoms due to electron interaction—ionic (transfer), covalent (sharing), metallic, etc. These bonds hold atoms together in molecules or crystals. Nuclear force holds protons and neutrons in nucleus. Gravitational and magnetic forces are negligible at atomic scale. Bond energy determines stability; stronger bond means more energy required to break.

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Practice More chemistry Questions

Question #1
An enzyme that digests proteins in the stomach is:
A. Ptyalin
B. Lipase
C. Pepsin
D. Amylase

Correct Answer: Option C


Explanation:
Pepsin is a protease secreted in the stomach; it hydrolyzes proteins into peptides. Ptyalin (salivary amylase) digests starch; amylase also breaks starch; lipase digests fats.

This question belongs to: Science chemistry
Question #2
Consider the following statements: 1. Chromatography separates components based on differential adsorption. 2. The component that is more strongly adsorbed moves faster. Which statement(s) is/are correct?
A. Both 1 and 2
B. Neither 1 nor 2
C. 1 only
D. 2 only

Correct Answer: Option C


Explanation:
Chromatography is an advanced technique used to separate mixtures based on the differential adsorption of components onto a stationary phase. The component that is more strongly adsorbed to the stationary phase moves slower, not faster. Therefore, only statement 1 is correct, making option A the right choice.

This question belongs to: Science chemistry
Question #3
Which of the following statements about catalysts is correct?
A. They change the equilibrium constant
B. They lower the activation energy of the reaction
C. They are consumed in the reaction
D. They are always solid

Correct Answer: Option B


Explanation:
Catalysts provide an alternative pathway with lower activation energy, increasing reaction rate without being consumed. They do not affect equilibrium constant or thermodynamic parameters (ΔH, ΔS). They can be solid (heterogeneous), liquid, or gas. Enzymes are liquid-phase catalysts. A catalyst does not change the position of equilibrium, only speeds up attainment.

This question belongs to: Science chemistry