Basic Separation Techniques
Chemistry · 11th Class (Intermediate Part 1) · BISE Lahore
Tests for this chapter
Tests run in your chosen medium — the sample below shows both.
Basic Separation Techniques Test
10 questions · Basic Separation Techniques × 10
Full Book Test
20 questions · Periodic Table and Periodic Properties × 1, Atomic Structure × 1, Chemical Bonding × 2, Stoichiometry × 1, States and Phases of Matter × 1, Chemical Energetics × 2, Reaction Kinetics × 1, Chemical Equilibrium × 1, Acid-Base Chemistry × 1, Electrochemistry × 2, Hydrocarbons × 2, Nitrogen and Sulfur × 1, Halogens × 1, Atmosphere × 1, Basic Separation Techniques × 1, Lab Safety and Practical Skills × 1
Sample questions
Showing 10 of 70 questions from this chapter. The full bank is in the chapter test below.
- 1
The branch of chemistry that deals with the chemical characterization of substances is called:
- A.physical chemistry
- B.organic chemistry
- C.analytical chemistry (correct answer)
- D.industrial chemistry
Why: Analytical chemistry is the science of chemical characterization. A complete characterization covers both qualitative analysis (which elements are present) and quantitative analysis (how much of each is present). - 2
The detection or identification of the elements present in a compound is the concern of:
- A.qualitative analysis (correct answer)
- B.quantitative analysis
- C.gravimetric analysis
- D.volumetric analysis
Why: Qualitative analysis tells us which elements are present in a compound. Quantitative analysis goes further and measures the relative amounts of those elements. - 3
Determining the relative amounts of the elements present in a compound is carried out by:
- A.qualitative analysis
- B.chromatographic analysis
- C.spectral analysis
- D.quantitative analysis (correct answer)
Why: Quantitative analysis determines the relative amounts of the elements in compounds. Qualitative analysis is limited to detecting or identifying which elements are present. - 4
Which of the following is NOT one of the four major steps of a complete quantitative determination?
- A.Obtaining a sample for analysis
- B.Selecting a locating agent for colourless spots (correct answer)
- C.Separation of the desired constituent
- D.Drawing conclusions from the analysis
Why: The four steps are obtaining a sample, separation of the desired constituent, measurement and calculation of results, and drawing conclusions. Locating agents belong to paper chromatography, not to this list. - 5
In a solution of common salt in water, the component present in excess is called the:
- A.solute
- B.residue
- C.filtrate
- D.solvent (correct answer)
Why: In any solution the solvent is the component present in excess as compared with the solute. Here water is in excess, so water is the solvent and common salt is the solute. - 6
Common salt has to be separated from a mixture of common salt and sand by dissolving one component and then filtering. Which liquid is the most suitable solvent?
- A.Distilled water (correct answer)
- B.Absolute ethanol
- C.Chloroform
- D.Carbon tetrachloride
Why: The solvent chosen must dissolve one component completely while the other stays practically insoluble. Common salt dissolves freely in water while sand does not, so water separates the two; the salt is almost insoluble in ethanol, chloroform and carbon tetrachloride. - 7
The clear liquid that collects in the conical flask below the funnel during filtration is called the:
- A.residue
- B.filtrate (correct answer)
- C.mother liquor
- D.distillate
Why: The liquid which passes through the filter medium and is collected underneath the funnel is the filtrate. The mother liquor is the liquid left around crystals after crystallization, and a distillate comes from distillation. - 8
When a solution of common salt is filtered, the sand that stays behind on the filter paper is known as the:
- A.filtrate
- B.solvent
- C.residue (correct answer)
- D.distillate
Why: The undissolved solid left behind on the filter medium is called the residue. The liquid that passes through is the filtrate, and a distillate is obtained only in distillation. - 9
Filtration is the technique used to separate:
- A.two miscible liquids differing in boiling point
- B.a coloured dye from a mixture of dyes
- C.two solids having different solubilities
- D.an insoluble solid from a two-component mixture (correct answer)
Why: Filtration removes the insoluble component of a two-component heterogeneous mixture from the solution. Miscible liquids are separated by distillation, dyes by chromatography and two solids of different solubilities by crystallization. - 10
A mixture of sand and common salt is shaken with distilled water and then filtered. The common salt is found in the:
- A.filtrate (correct answer)
- B.residue
- C.filter paper
- D.filter medium
Why: Common salt dissolves in water to give a homogeneous solution which passes through the filter paper, so it appears in the filtrate. Sand remains undissolved and is left behind as the residue.