Vulcanization of rubber was discovered by: MCQ with Answer and Explanation

Vulcanization of rubber was discovered by:
A. Charles Goodyear
B. Wallace Carothers
C. Leo Baekeland
D. John Boyd Dunlop
Answer: Option A
Solution (By JKSSB Mock Tests)
Charles Goodyear accidentally discovered vulcanization (heating rubber with sulfur) in 1839, which improved rubber's elasticity and strength. Dunlop invented pneumatic tire; Baekeland invented Bakelite; Carothers nylon.

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Practice More chemistry Questions

Question #1
According to Charles' law, at constant pressure, volume of a gas is directly proportional to:
A. Absolute temperature (Kelvin)
B. Temperature in Celsius
C. Pressure
D. Density

Correct Answer: Option A


Explanation:
V ∝ T (in Kelvin). Using Celsius gives a linear relationship but not direct proportionality (line does not pass through origin). Absolute zero (0 K = -273.15°C) is the theoretical temperature of zero volume.

This question belongs to: Science chemistry
Question #2
The process in which a heavy nucleus splits into two lighter nuclei with the release of enormous energy is called:
A. Radioactive decay
B. Nuclear fission
C. Transmutation
D. Nuclear fusion

Correct Answer: Option B


Explanation:
Nuclear fission is a reaction in which the nucleus of a heavy atom (like Uranium-235 or Plutonium-239) splits into two or smaller, lighter nuclei when bombarded by a neutron, releasing a massive amount of energy and more neutrons, potentially causing a chain reaction.

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Question #3
Which of the following compounds contains a coordinate covalent bond?
A. NaCl
B. NH₄⁺
C. H₂O
D. Cl₂

Correct Answer: Option B


Explanation:
In the ammonium ion (NH₄⁺), the nitrogen atom in ammonia (NH₃) shares its lone pair of electrons with a hydrogen ion (H⁺) which has no electrons. This type of bond, where both shared electrons are donated by a single atom, is a coordinate covalent (dative) bond.

This question belongs to: Science chemistry