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1. Which of the following methods is the most suitable to obtain a pure and dry sample of sodium chloride from a mixture of solid sodium chloride and sand?
- Shake the mixture with H₂O and distill the liquid
correct - Shake the mixture with H₂O filter and evaporate the filtrate
- Heat the mixture gently and collect the substance which melts
- Shake the mixture with H₂O filter and dry the substance on the filter paper
2. Choose the pair of following components which can be separated by sublimation process
- NaCI and KCI
- sand and NaCI
- Send and Naphthalene
correct - Sand and broken piece of glass
3. During the process of crystallization, the hot saturated solution:
- Is mixed with an immiscible liquid to get the pure crystals of the products
- Is cooled at a moderate rate to get medium sized crystals
- Is evaporated to get the crystals of the products
correct - Is cooled very slowly to get large sized crystals
4. An insoluble solid can be separated from a liquid by
- Chromatography
- Sublimation
- Filtration
correct - Crystallization
5. Solvent extraction method is a particularly useful technique for separation when the product to be separated is:
- Volatile or thermally stable
- Volatile or thermally unstablecorrect
- Non – volatile or thermally unstable
- Non-volatile of thermally stable
6. There are as many as seven steps used in
- Filtration techniques
- Solvent extraction techniques
- Chromatography techniques
- Crystallization techniques
correct
7. Which of the following is not a separation technique?
- Sublimation
- solvent extraction
- filtration
- boilingcorrect
8. Solvent extraction is an equilibrium process and it is controlled by:
- The amount of solute
- Law of mass action
- Distribution lawcorrect
- The amount of solvent used
9. Which one of the following techniques can be used to separate NaCI and sand?
- formation of solution and evaporation
- sublimation
- formation of solution and filtration
correct - chromatography
10. A comparative rates at which the solutes move in the paper chromatography depends on:
- The size of paper used
- Their Rf values
correct - Their partition coefficients
- The polarity of solvent used
11. Sublimation is a separation technique used to remove a:
- Low boiling component from a high boiling component
- Fast moving component from a slow moving component
- Non volatile component from a volatile component
correct - Miscible liquid from a solid
12. Filtration through Gooch and sintered glass crucibles is aided by a gentle suction
- It should deposit well formed crystals of the pure compoundcorrect
- For preparation of chemical compound
- It dissolves a large amount of the substance
- Quick filtration can be done
13. During the process of crystallization, the hot saturated solution
- Is cooled very slowly to get large sized crystals
- Is mixed with an immiscible liquid to get the pure crystals of the product
- Is evaporated to get crystals of product
- Is cooled at a moderate rate to get medium sized crystalscorrect
14. Sintered glass crucible is used to
- Convenient filtration than that by Gooch crucible
correct - Avoid premature crystallization of solids
- Separate two liquids
- Purify a solid
15. A filtration process could be very time consuming if it were not added by a gentle suction, which is developed.
- If the paper covers the funnel up to its circumference
- If the paper fits tightlycorrect
- If the stem of the funnel is large so that it dips into the filtrate
- If the paper has got small sized pours in it
Entry Test 2021 Chemistry Experimental Techniques MCQS Online Preparation Sample Paper 2 Questions with Answer
1. From which mixture can the fast substance be obtained by adding water stirring and filtering?
- sulphate
- Sodium chloride and coppercorrect
- Oxygen and nitrogen
- Magnesium and iron
2. Preparation of aspirin is carried out by the reaction of salicylic acid with
- Acetic acid and water
- Acetic acid and ethyl alcohol
- Acetic acid and sulfuric acid
- Acetic acid and acetic an hydride
correct
3. For smooth filtration one of the following precautions should be observed
- The filter paper should be small
- The tip of funnel should not touch the beaker
- The stem of the funnel should remain continuously full of liquids
- The stem of the funnel should be smallcorrect
4. The solvent is selected for crystallization of a substance on the basis of:
- Its polar nature
- It non-polar nature
- On hit and trial basis
correct - It should react chemically
5. The top of funnel stem should touch the side of the beaker because
- This gives bigger size crystals
- Filtrate runs down without crystals
- This gives medium size crystals
correct - The filtrate is quick
6. What method is used to remove insoluble solids from muddy water?
- Chlorination
- Evaporation
- Distillation
- Filtration
correct
7. A bottle of copper (II) oxide has been contaminated wit5h some solid, NaCI. How can NaCI be removed from the (II) oxide?
- Heat the mixture and allow it to cool
- Add water to the mixture and filtercorrect
- Add dilute acid to the mixture and filter
- Place the mixture in a separating funnel
8. A filtration process could be very time consuming if it was not added by a gentle suction which is developed
- If the paper has got small size pores in it
- If the paper covers the funnel up to its circumference
correct - If the stem of the funnel is large so that it dips into the filtrate
- If the paper fits tightly
9. Sublimation is a process for the separation of:
- Solute and solvent from a solution
- Volatile and non-volatile solids
correct - Ionic and covalent compound
- Solution of volatile and non-volatile liquids
10. Solvent extraction method is particularly useful technique for separation when the product to be separated is:
- Volatile or thermally unstablecorrect
- Non –volatile or thermally unstable
- Volatile or thermally stable
- Non- volatile or thermally stable
11. Slow cooling of hot saturated solution yields.
- Premature crystallization of the solute
- Large size crystals
correct - Immiscible liquids
- Medium size crystal
12. The process of filtration is used to:
- Separate the two miscible liquids
- Separate insoluble particles from liquidscorrect
- Separate solute from solution
- Separate the two immiscible liquids
13. Gooch crucible is used in a suction filtering apparatus, because:
- A solid compound is purified
- It keeps the stem of funnel full of liquid
- It is used for filtration of precipitates which need to be in ignited
correct - It is used to separate organic compound from water
14. Fluted filter paper is used for
- Filtering the hot saturated solution
correct - To avoid premature crystallization of the solute
- To dissolve large amount of substance at its boiling point
- Increasing the rate of filtration
15. A flask contains the liquids trichloromethane (chloroform) and H₂O They are separated using a separating funnel. Which conclusion can be made form this observation alone?
- Trichloromethane has a higher density than water
- Trichloromethane and water have different relative masses
- Trichloromethane and water do not mixcorrect
- Trichloromethane and water having different boiling points
Chemistry
- Basic Concepts
- Experimental Techniques
- Gases
- Liquids and Solids
- Atomic Structure
- Chemical Bonding
- Alcohols, Phenols And Ethers
- Solutions
- Chemical Equilibrium
- Electro Chemistry
- Periodic Classification Of Elements & Periodicity
- The Halogens and Noble Gases
- Group III A And IV A Elements
- S-Block Elements
- Fundamental Principles of Organic Chemistry