Ionization energy is the energy required to: MCQ with Answer and Explanation

Ionization energy is the energy required to:
A. Add an electron to a gaseous atom
B. Remove the most loosely held electron from a gaseous atom
C. Form an ionic crystal
D. Break a covalent bond
Answer: Option B
Solution (By JKSSB Mock Tests)
Ionization energy (IE) is the minimum energy needed to remove an electron from an isolated gaseous atom in its ground state to form a cation. A(g) → A⁺(g) + e⁻. Adding an electron is electron affinity. IE is an indicator of reactivity. Metals have low IE, non-metals high IE.

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Practice More chemistry Questions

Question #1
Which salt is formed when hydrochloric acid reacts with sodium hydroxide?
A. Sodium carbonate
B. Sodium sulfate
C. Sodium nitrate
D. Sodium chloride

Correct Answer: Option D


Explanation:
HCl + NaOH → NaCl + H₂O. This is a neutralization reaction producing sodium chloride (common salt). NaNO₃ from HNO₃, Na₂SO₄ from H₂SO₄, Na₂CO₃ from H₂CO₃ (weak acid).

This question belongs to: Science chemistry
Question #2
Positive catalysts work by:
A. Changing equilibrium
B. Consuming reactants
C. Increasing activation energy
D. Decreasing activation energy

Correct Answer: Option D


Explanation:
Catalysts lower activation energy, providing an easier pathway, thus increasing reaction rate. They do not affect equilibrium constant or get consumed.

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Question #3
Which of the following is an extensive property of matter?
A. Density
B. Refractive index
C. Number of moles
D. Boiling point

Correct Answer: Option C


Explanation:
Extensive properties depend on the amount of substance. Number of moles (or mass, volume) is extensive. Density, refractive index, boiling point are intensive properties – they do not depend on the quantity. For example, 1 liter of water boils at 100°C, same as 10 liters. Intensive properties are useful for identifying substances.

This question belongs to: Science chemistry