The chemical formula of plaster of Paris is: MCQ with Answer and Explanation

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The chemical formula of plaster of Paris is:

A. CaSO₄·½H₂O

B. CaSO₄

C. CaO

D. CaSO₄·2H₂O

Answer: Option A

Solution (By JKExamLibrary)

Plaster of Paris is calcium sulfate hemihydrate, CaSO₄·½H₂O. It is prepared by heating gypsum (CaSO₄·2H₂O) at 373 K. It sets with water to form gypsum.

This question belongs to: Science chemistry

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Practice More chemistry Questions

Question #1

Which property increases down a group?

A. Electronegativity

B. Atomic radius

C. Ionization energy

D. Electron affinity

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Correct Answer: Option B

Explanation:
Atomic radius increases down a group due to addition of new shells. Ionization energy, electronegativity, and electron affinity (generally) decrease down a group.

This question belongs to: Science chemistry

Question #2

The reaction CaO + H₂O → Ca(OH)₂ is a:

A. Displacement

B. Combination

C. Redox

D. Decomposition

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Correct Answer: Option B

Explanation:
Two reactants combine to form a single product, so combination (also called synthesis). No oxidation state change, so not redox. Decomposition is opposite.

This question belongs to: Science chemistry

Question #3

Methane on chlorination in sunlight gives:

A. Carbon tetrachloride only

B. Methyl chloride and HCl

C. Ethane

D. Acetylene

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Correct Answer: Option B

Explanation:
CH₄ + Cl₂ → CH₃Cl + HCl (substitution). Further substitution yields CH₂Cl₂, CHCl₃, CCl₄. Sunlight provides free radicals.

This question belongs to: Science chemistry

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