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. Gravitational force
B. Magnetic force
C. Chemical bond
D. Nuclear force
Answer: Option C
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
Which fuel has the lowest calorific value?
A. Wood
B. Coal
C. Methane
D. Hydrogen

Correct Answer: Option A


Explanation:
Wood has lower calorific value (~17 kJ/g) compared to coal (~25-35 kJ/g), methane (~55.5 kJ/g), and hydrogen (~142 kJ/g). It contains moisture and oxygen, reducing energy density.

This question belongs to: Science chemistry
Question #2
Consider the following statements regarding cathode rays: 1. They originate from the cathode. 2. They are made of electromagnetic waves. 3. They cast shadows. Which are correct?
A. 1 and 3 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2 and 3

Correct Answer: Option A


Explanation:
Cathode rays are streams of fast-moving electrons, not electromagnetic waves, originating from the cathode in a discharge tube. Because they are material particles traveling in straight lines, they can be stopped by opaque objects, thus casting sharp shadows. Therefore, statements 1 and 3 are correct.

This question belongs to: Science chemistry
Question #3
In electroplating of copper on an iron spoon, the electrolyte used is:
A. Sodium chloride solution
B. Iron sulfate
C. Copper sulfate solution
D. Sulfuric acid

Correct Answer: Option C


Explanation:
Acidified copper sulfate (CuSO₄) solution is the electrolyte. The iron spoon is the cathode, and a pure copper plate is the anode. Cu²⁺ ions are reduced at the cathode and deposited on the spoon. Fe from spoon does not go into solution because it is cathode.

This question belongs to: Science chemistry