Tag: basic analytical techniques

Questions Related to basic analytical techniques

John tried to separate sugar from its solution using the evaporation method. However, he was unsuccessful. Which of the following is the likely reason?

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. There was insufficient sugar in the solution

  2. He had forgotten to stir the solution during heating

  3. The sugar had decomposed

  4. The sugar had vaporised.

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Correct Option: C
Explanation:
John tried to separate sugar from its solution using the evaporation method. However, he was unsuccessful as the sugar had decomposed. When you sugar (sucrose) is heated, it undergoes dehydration. The crystalline structure breaks down. Molecules decompose into glucose and fructose and then lose water and polymerize to form caramel, which is a red-orange colored solid.

Sand that is needed for a project has some common salt accidentally mixed with it. which of the following processes need to be used to separate sand and salt?
1. Filtration
2. Evaporation
3. Distillation
4. Crystallisation

chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

  1. 1, 2

  2. 1,2 and 4

  3. 1, 2 and 3

  4. 1,2,3 and 4

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Correct Option: A
Explanation:

To separate the mixture of salt and sand;

first we will make the aqueous solution, salt gets dissolved in water and sand particle remain undissolved,
so, the misture can be separated by filtration and evaporation.