Chemical changes result in new substances; physical changes do not change the chemical composition.
Which one of the following is not a chemical change?
Asked in UPSC NDA 1 2016 · Topic: Physical and Chemical Changes, Solution (Distinction between Physical and Chemical Changes)
More Chemistry questions
- Which one of the following substances is NOT a mixture ?
- Match List I with List II and select the correct answer using the code given below the Lists : List II List I (Type of (Process) change)
- Consider the following statements in view of rusting of Iron :
- Which one of the following is a compound ?
- Which one among the following statements is correct ?
- Which of the following are not chemical changes ? 1. Tempering of iron 2. Conversion of iron piece into an electro-magnet by passing the current around the iron 3. Melting of iron 4. Rusting of iron Select the correct answer using the code given below :
- Which of the following is/are the example/ examples of chemical change? 1. Crystallization of sodium chloride 2. Melting of ice 3. Souring of milk Select the correct answer using the code given below.
- Crystallization of sodium chloride: This is a process where dissolved salt precipitates out of a solution as crystals. It is a physical change because the chemical composition (NaCl) remains the same. 2. Melting of ice: This is a change of state from solid water (ice) to liquid water. It is a physical change because the substance is still water (H₂O), just in a different form. 3. Souring of milk: This occurs when bacteria convert lactose (milk sugar) into lactic acid. This process creates new chemical substances (lactic acid) and changes the milk's properties (taste, smell, texture). This is a chemical change. 140. Which one of the following statements about air is correct ?