Sodium carbonate is a salt of: MCQ with Answer and Explanation

Sodium carbonate is a salt of:
A. Weak acid and strong base
B. Strong acid and strong base
C. Strong acid and weak base
D. Weak acid and weak base
Answer: Option A
Solution (By JKSSB Mock Tests)
Na₂CO₃ is formed from NaOH (strong base) and H₂CO₃ (weak acid). Its aqueous solution is basic due to hydrolysis: CO₃²⁻ + H₂O ⇌ HCO₃⁻ + OH⁻. Strong acid + strong base salts are neutral (NaCl).

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Question #1
The chemical formula of Teflon is:
A. (CH₂-CHCl)ₙ
B. (CH₂-C₆H₅)ₙ
C. (CF₂-CF₂)ₙ
D. (CH₂-CH₂)ₙ

Correct Answer: Option C


Explanation:
Teflon (PTFE) is polymerized tetrafluoroethene, repeating unit –CF₂–CF₂–. Option A is PVC, C is polythene, D is polystyrene. Teflon is highly inert, used in non-stick cookware.

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Question #2
Which of the following gases is responsible for the depletion of the ozone layer?
A. Chlorofluorocarbons (CFCs)
B. Carbon dioxide
C. Sulfur dioxide
D. Methane

Correct Answer: Option A


Explanation:
Chlorofluorocarbons (CFCs), once widely used as refrigerants and propellants, are the primary culprits behind ozone depletion. When CFCs reach the stratosphere, UV radiation breaks them down, releasing chlorine atoms. A single chlorine atom can catalytically destroy thousands of ozone (O3) molecules.

This question belongs to: Science chemistry
Question #3
The modern periodic table is based on the periodic law proposed by:
A. John Dalton
B. Niels Bohr
C. Dmitri Mendeleev
D. Henry Moseley

Correct Answer: Option D


Explanation:
Henry Moseley discovered that the atomic number (number of protons) is the fundamental property of an element, not atomic mass. He proposed the modern periodic law: properties are periodic functions of atomic numbers. Mendeleev's law was based on atomic mass, which had anomalies.

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