Physical changes alter the form or appearance of a substance but not its chemical composition. Chemical changes result in the formation of new substances with different chemical properties.
Following are some processes involving changes of state : A. Evaporation of water B. Burning of candle C. Dissolution of sugar in water D. Electrolysis of water to form hydrogen and oxygen Select the correct option :
Asked in HAS Prelims 2021 · Topic: Physical and Chemical Changes, Solution (Definition and Characteristics of Physical Changes)
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Answer: D. B involves both physical and chemical change
More Chemistry questions
- Consider the following statements: 1. Evaporation is a surface phenomenon, meaning particles from the surface change into vapour state. 2. Boiling is a bulk phenomenon, meaning particles from the bulk of the liquid change into vapour state. 3. Deposition is the change of gaseous state directly to solid state without changing into liquid state. 4. The state of matter can only be changed by changing its temperature. Which of the following is correct?
- Which of the following are true about nanomaterials? (a) The properties strongly depend on the surface atoms. (b) They have large surface area. (c) Nanoparticles have typical sizes > 100 nm. (d) We cannot see particles of nanomaterials from the naked eye. Select the correct answer using the code given below :
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- Which one of the following methods can be used to separate anthracene from a mixture of salt and anthracene ?
- The intermixing of particles of two different types of matter on their own is called
- A change of state directly from solid to gas without changing into liquid state is called :
- Which one among the following statements about matter is NOT correct ?
