alleryStart learning →Plaster of Paris is chemically:
- CaCO₃
- CaSO₄·½H₂O
- CaCl₂·2H₂O
- CaSO₄·2H₂O
Show answer and solution
Correct answer: B. CaSO₄·½H₂O
Plaster of Paris is calcium sulfate hemihydrate, CaSO₄·½H₂O.
The hemihydrate sets to gypsum (CaSO₄·2H₂O) on adding water.
Indian Navy INET Acids, Bases and Salts — practice questions
Explore 3 free Acids, Bases and Salts questions in Indian Navy INET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
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Worked practice questions
Farmers add slaked lime, Ca(OH)₂, to soil that is too:
- salty
- sandy
- acidic
- basic
Show answer and solution
Correct answer: C. acidic
Slaked lime is a base.
It neutralises acidic soil, bringing the pH closer to neutral so crops grow better.
Which of the following is used for dissolution of gold?
- Hydrochloric acid
- Aqua regia
- Sulphuric acid
- Nitric acid
Show answer and solution
Correct answer: B. Aqua regia
This Acids, Bases and Salts item tests a core Chemistry concept.
Correct answer: Aqua regia.
_Source: syllabus Exemplar Science Class 10_
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