important question of science of class 9 ncert for practice plzzzzzzzz
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Given below are some very important questions for long answer type questions for CBSE class 9 Science exam:
Given below are some very important questions for long answer type questions for CBSE class 9 Science exam:Question 1. (a) Which method will you use to separate : (i) components of air (ii) acetone and water? Explain each.
Given below are some very important questions for long answer type questions for CBSE class 9 Science exam:Question 1. (a) Which method will you use to separate : (i) components of air (ii) acetone and water? Explain each.(b) What is the difference in the apparatus used for distillation and fractional distillation?
Given below are some very important questions for long answer type questions for CBSE class 9 Science exam:Question 1. (a) Which method will you use to separate : (i) components of air (ii) acetone and water? Explain each.(b) What is the difference in the apparatus used for distillation and fractional distillation?Answer.
Given below are some very important questions for long answer type questions for CBSE class 9 Science exam:Question 1. (a) Which method will you use to separate : (i) components of air (ii) acetone and water? Explain each.(b) What is the difference in the apparatus used for distillation and fractional distillation?Answer.(a) (i) Separation of constituents of air by fractional distillation:
Given below are some very important questions for long answer type questions for CBSE class 9 Science exam:Question 1. (a) Which method will you use to separate : (i) components of air (ii) acetone and water? Explain each.(b) What is the difference in the apparatus used for distillation and fractional distillation?Answer.(a) (i) Separation of constituents of air by fractional distillation:Air consists mainly of nitrogen and oxygen. Carbon dioxide and other gases are also present in trace amounts. To separate these different gases first we need to liquify the air. When the air is compressed and cooled down, at 0°C, water present in air freezes to ice. On further cooling, carbon dioxide separated as dry ice at about -78°C. on further cooling under pressure, air gets liquefied at -200°C. After this, through fractional distillation each gas can be separated on the basis of their boiling points. The gas having lower boiling point will be obtained first and the gas having highest boiling points will be obtained at last.
Nitrogen has a boiling point of -196°C while oxygen has -183°C. The nitrogen gas will start to escape through the outlet and it is collected. The liquid oxygen will be collected in the fractionating column.
Nitrogen has a boiling point of -196°C while oxygen has -183°C. The nitrogen gas will start to escape through the outlet and it is collected. The liquid oxygen will be collected in the fractionating column.(ii) Separation of acetone and water:
Nitrogen has a boiling point of -196°C while oxygen has -183°C. The nitrogen gas will start to escape through the outlet and it is collected. The liquid oxygen will be collected in the fractionating column.(ii) Separation of acetone and water:It can be done by simple distillation method. In this method, the components of mixture are separated on the basis of difference in boiling points of constituent liquids. First, the lower boiling point liquid will start boiling and its vapours can be collected and condensed to obtain the liquid. In this case acetone will come out first and left over will be water only.Nitrogen has a boiling point of -196°C while oxygen has -183°C. The nitrogen gas will start to escape through the outlet and it is collected. The liquid oxygen will be collected in the fractionating column.
Nitrogen has a boiling point of -196°C while oxygen has -183°C. The nitrogen gas will start to escape through the outlet and it is collected. The liquid oxygen will be collected in the fractionating column.(ii) Separation of acetone and water:
Nitrogen has a boiling point of -196°C while oxygen has -183°C. The nitrogen gas will start to escape through the outlet and it is collected. The liquid oxygen will be collected in the fractionating column.(ii) Separation of acetone and water:It can be done by simple distillation method. In this method, the components of mixture are separated on the basis of difference in boiling points of constituent liquids. First, the lower boiling point liquid will start boiling and its vapours can be collected and condensed to obtain the liquid. In
this case acetone will come out first and left over will be water only.
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