Unit-18 Qualitative Anaylsis

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Unit-18 Qualitative Anaylsis

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1
A. which substances are present in a sample
B. the exact mass of a substance
C. the volume of a gas evolved
D. the concentration of a solution
Answer: Qualitative analysis identifies the presence of components in a sample.
2
A. the identity of a salt
B. the amount of a substance in a sample
C. the color of a precipitate
D. the smell of a gas
Answer: Quantitative analysis measures how much of a substance is present.
3
A. flame test
B. limewater test
C. quantitative analysis
D. dry heating test
Answer: Measuring percentages is a quantitative analysis task.
4
A. Qualitative analysis
B. Quantitative analysis
C. Gravimetric analysis
D. Titrimetric analysis
Answer: Qualitative analysis detects ions but not their quantities.
5
A. AgNO3 solution
B. BaCl2 solution
C. NaOH solution
D. limewater
Answer: BaCl2 forms a white precipitate of BaSO4 with sulfate ions.
6
A. Potassium
B. Copper
C. Sodium
D. Calcium
Answer: Sodium compounds give a yellow-orange flame.
7
A. lilac (violet)
B. apple green
C. brick red
D. crimson
Answer: Potassium salts give a lilac-violet flame.
8
A. absorb all colors equally
B. reflect white light
C. melt and glow red
D. emit light of specific colors
Answer: Excited metal atoms emit light of characteristic wavelengths.
9
A. green vs blue
B. red vs white
C. yellow-orange vs lilac
D. orange vs green
Answer: Sodium is yellow-orange; potassium is lilac.
10
A. intensify the red color
B. absorb the yellow light of sodium
C. prevent the salt from spattering
D. cool the flame
Answer: Cobalt glass filters sodium's yellow light, revealing other flame colors.
11
A. Barium
B. Copper
C. Strontium
D. Sodium
Answer: Barium salts burn with an apple green flame.
12
A. Crimson
B. Brick red
C. Lilac
D. Apple green
Answer: Calcium gives a brick red flame.
13
A. Bright yellow
B. Lilac
C. Brick red
D. Green or blue-green
Answer: Copper compounds give green or blue-green flames.
14
A. Crimson
B. Yellow
C. Apple green
D. Violet
Answer: Strontium produces a crimson red flame.
15
A. Ba2+
B. Ca2+
C. Na+
D. K+
Answer: Sodium's intense yellow flame masks the colors of other metals.
16
A. smells of vinegar
B. has a pungent smell of ammonia
C. is completely odorless
D. smells of burning sulfur
Answer: Ammonium salts liberate ammonia gas with NaOH.
17
A. NH3
B. CO2
C. SO2
D. H2
Answer: Ammonia gas is colorless and has a pungent smell.
18
A. red
B. black
C. blue
D. green
Answer: Ammonia is basic and turns red litmus blue.
19
A. white ppt with BaCl2
B. brown ring formation
C. ammonia smell on heating with NaOH, gas turns red litmus blue
D. effervescence with dilute HCl
Answer: NH4+ gives NH3 with NaOH, which turns red litmus blue.
20
A. NH3 and HCl
B. N2 and H2
C. NO2 and Cl2
D. NH3 and H2
Answer: NH4Cl decomposes into ammonia and HCl gases which recombine on cooling.
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