Class 6 Exam > Class 6 Questions > Mixtures need to be separated becausea)to rem...
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Mixtures need to be separated because
- a)to remove undesirable substances
- b)to get desirable substances
- c)to obtain highly pure substances
- d)all of the above
Correct answer is option 'D'. Can you explain this answer?
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Mixtures need to be separated becausea)to remove undesirable substance...
Introduction:
Mixtures are combinations of two or more substances that are physically mixed together but can be separated through various methods. The need to separate mixtures arises due to several reasons, including the removal of undesirable substances, obtaining desirable substances, and obtaining highly pure substances. Consequently, the correct answer to the given question is option 'D', which encompasses all of the above reasons.
Explanation:
1. Removal of Undesirable Substances:
One of the primary reasons for separating mixtures is to remove undesirable substances. In many cases, mixtures contain impurities or unwanted components that need to be eliminated in order to obtain a desired product or to make the mixture safe for consumption. Separation techniques such as filtration, distillation, and chromatography are commonly employed for this purpose.
- Filtration: Filtration is used to separate a solid-liquid mixture, where the solid particles are larger than the pores of the filter paper or mesh, allowing only the liquid to pass through.
- Distillation: Distillation is used to separate a mixture of two or more liquids with different boiling points. The mixture is heated, and the component with the lower boiling point vaporizes first and can be collected separately.
- Chromatography: Chromatography is a technique that is used to separate a mixture into its individual components based on their different affinities to a mobile phase and a stationary phase.
2. Obtaining Desirable Substances:
Separating mixtures is also essential for obtaining desirable substances. Sometimes, mixtures contain valuable or useful substances that need to be isolated for further processing or utilization. By employing suitable separation methods, these substances can be obtained in their pure form.
- Evaporation: Evaporation is used to separate a mixture of a solid dissolved in a liquid. The mixture is heated, and the liquid component evaporates, leaving behind the solid residue.
- Crystallization: Crystallization is a technique used to separate a solid dissolved in a liquid by cooling the mixture. The dissolved solid forms crystals, which can be separated from the liquid.
- Sublimation: Sublimation is the process of separating a mixture where one component undergoes sublimation, i.e., it changes directly from a solid to a gaseous state without passing through the liquid phase. The sublimed substance can be collected separately.
3. Obtaining Highly Pure Substances:
Separating mixtures is also essential to obtain highly pure substances. In many scientific and industrial applications, it is necessary to isolate individual components of a mixture with a high degree of purity. This can be achieved through various separation techniques.
- Centrifugation: Centrifugation is used to separate mixtures based on the differences in density or particle size. The mixture is spun rapidly, causing the denser or larger particles to settle at the bottom, while the lighter or smaller particles remain in the liquid or on top.
- Decantation: Decantation is a simple method used to separate a mixture of a solid settled at the bottom of a container and a liquid. The liquid is carefully poured off, leaving the solid behind.
- Electrolysis: Electro
Mixtures are combinations of two or more substances that are physically mixed together but can be separated through various methods. The need to separate mixtures arises due to several reasons, including the removal of undesirable substances, obtaining desirable substances, and obtaining highly pure substances. Consequently, the correct answer to the given question is option 'D', which encompasses all of the above reasons.
Explanation:
1. Removal of Undesirable Substances:
One of the primary reasons for separating mixtures is to remove undesirable substances. In many cases, mixtures contain impurities or unwanted components that need to be eliminated in order to obtain a desired product or to make the mixture safe for consumption. Separation techniques such as filtration, distillation, and chromatography are commonly employed for this purpose.
- Filtration: Filtration is used to separate a solid-liquid mixture, where the solid particles are larger than the pores of the filter paper or mesh, allowing only the liquid to pass through.
- Distillation: Distillation is used to separate a mixture of two or more liquids with different boiling points. The mixture is heated, and the component with the lower boiling point vaporizes first and can be collected separately.
- Chromatography: Chromatography is a technique that is used to separate a mixture into its individual components based on their different affinities to a mobile phase and a stationary phase.
2. Obtaining Desirable Substances:
Separating mixtures is also essential for obtaining desirable substances. Sometimes, mixtures contain valuable or useful substances that need to be isolated for further processing or utilization. By employing suitable separation methods, these substances can be obtained in their pure form.
- Evaporation: Evaporation is used to separate a mixture of a solid dissolved in a liquid. The mixture is heated, and the liquid component evaporates, leaving behind the solid residue.
- Crystallization: Crystallization is a technique used to separate a solid dissolved in a liquid by cooling the mixture. The dissolved solid forms crystals, which can be separated from the liquid.
- Sublimation: Sublimation is the process of separating a mixture where one component undergoes sublimation, i.e., it changes directly from a solid to a gaseous state without passing through the liquid phase. The sublimed substance can be collected separately.
3. Obtaining Highly Pure Substances:
Separating mixtures is also essential to obtain highly pure substances. In many scientific and industrial applications, it is necessary to isolate individual components of a mixture with a high degree of purity. This can be achieved through various separation techniques.
- Centrifugation: Centrifugation is used to separate mixtures based on the differences in density or particle size. The mixture is spun rapidly, causing the denser or larger particles to settle at the bottom, while the lighter or smaller particles remain in the liquid or on top.
- Decantation: Decantation is a simple method used to separate a mixture of a solid settled at the bottom of a container and a liquid. The liquid is carefully poured off, leaving the solid behind.
- Electrolysis: Electro
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Mixtures need to be separated becausea)to remove undesirable substancesb)to get desirable substancesc)to obtain highly pure substancesd)all of the aboveCorrect answer is option 'D'. Can you explain this answer?
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