Class 9 Exam > Class 9 Questions > Find the incorrect statementa)No energy chang... Start Learning for Free
Find the incorrect statement
- a)No energy changes occur when the constituent of air tried to be mixed.
- b)Purity of compounds can be tested by determining their melting points.
- c)Cesium and gallium are liquids above 300C.
- d)Mixture can be called as a single substance
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Find the incorrect statementa)No energy changes occur when the constit...
Air is mixture and no energy change occurs during mixing of air. Cesium and gallium are liquid at room temperature. Pure substance have fixed melting and boiling points. Mixture is not a single substance.
Most Upvoted Answer
Find the incorrect statementa)No energy changes occur when the constit...
Explanation:
- A mixture is a combination of two or more substances that are physically combined and can be separated by physical means. It does not involve any chemical reactions, so no energy changes occur when the constituents of air are mixed. Therefore, statement a) is correct.
- The purity of compounds can be tested by determining their melting points. Pure compounds have specific melting points, and any impurities present in the compound can cause the melting point to change or become a range of temperatures. Therefore, statement b) is correct.
- Cesium (Cs) and gallium (Ga) are both elements that exist as liquids at or above 300 degrees Celsius. Cesium has a melting point of 28.44 degrees Celsius and gallium has a melting point of 29.76 degrees Celsius. Therefore, statement c) is correct.
- A mixture cannot be called a single substance because it is a combination of different substances. A mixture retains the properties of its individual components and can be separated by physical means. Therefore, statement d) is incorrect.
Incorrect Statement:
d) Mixture can be called as a single substance
Correct Statements:
a) No energy changes occur when the constituents of air are mixed.
b) The purity of compounds can be tested by determining their melting points.
c) Cesium and gallium are liquids above 300 degrees Celsius.
- A mixture is a combination of two or more substances that are physically combined and can be separated by physical means. It does not involve any chemical reactions, so no energy changes occur when the constituents of air are mixed. Therefore, statement a) is correct.
- The purity of compounds can be tested by determining their melting points. Pure compounds have specific melting points, and any impurities present in the compound can cause the melting point to change or become a range of temperatures. Therefore, statement b) is correct.
- Cesium (Cs) and gallium (Ga) are both elements that exist as liquids at or above 300 degrees Celsius. Cesium has a melting point of 28.44 degrees Celsius and gallium has a melting point of 29.76 degrees Celsius. Therefore, statement c) is correct.
- A mixture cannot be called a single substance because it is a combination of different substances. A mixture retains the properties of its individual components and can be separated by physical means. Therefore, statement d) is incorrect.
Incorrect Statement:
d) Mixture can be called as a single substance
Correct Statements:
a) No energy changes occur when the constituents of air are mixed.
b) The purity of compounds can be tested by determining their melting points.
c) Cesium and gallium are liquids above 300 degrees Celsius.
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Find the incorrect statementa)No energy changes occur when the constituent of air tried to be mixed.b)Purity of compounds can be tested by determining their melting points.c)Cesium and gallium are liquids above 300C.d)Mixture can be called as a single substanceCorrect answer is option 'D'. Can you explain this answer? for Class 9 2026 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Find the incorrect statementa)No energy changes occur when the constituent of air tried to be mixed.b)Purity of compounds can be tested by determining their melting points.c)Cesium and gallium are liquids above 300C.d)Mixture can be called as a single substanceCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 9 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Find the incorrect statementa)No energy changes occur when the constituent of air tried to be mixed.b)Purity of compounds can be tested by determining their melting points.c)Cesium and gallium are liquids above 300C.d)Mixture can be called as a single substanceCorrect answer is option 'D'. Can you explain this answer?.
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