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Chapter 1 - Transition Elements and Iron Metallurgy

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Chapter 3 - Chemical Equilibrium

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Chapter 5 - Organic Chemistry

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Interactive Quiz and Evaluation: Lesson 2 – Chemical Analysis and Qualitative Separation of Anions and Cations

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1.
When dilute hydrochloric acid is added to a solid salt, a gas is evolved with a pungent odor that turns acidified potassium dichromate paper green while a colloidal yellow precipitate of sulfur separates in the reaction vessel. The anion is:
Thiosulfate (S2O32−)
Sulfite (SO32−)
Sulfide (S2−)
Sulfate (SO42−)
2.
To distinguish between a white precipitate of barium sulfate (BaSO4) and a white precipitate of barium phosphate (Ba3(PO4)2), one should add:
Boiling distilled water
Ammonium hydroxide solution
Dilute hydrochloric acid (Ba3(PO4)2 dissolves while BaSO4 remains insoluble)
Concentrated nitric acid in the dark
3.
A metal cation that forms a gelatinous white precipitate with NaOH which completely redissolves in excess reagent to form a soluble clear solution is:
Al3+ (due to the formation of soluble sodium meta-aluminate NaAlO2)
Fe2+
Fe3+
Ca2+
4.
In a titration experiment, 20.0 mL of 0.15 M H2SO4 is completely neutralized by 30.0 mL of NaOH solution. The molar concentration of the NaOH solution is:
0.05 M
0.20 M
0.10 M
0.30 M
5.
The indicator that exhibits a yellow color in acidic medium, blue in alkaline medium, and green in neutral medium is:
Methyl orange
Phenolphthalein
Litmus solution
Bromothymol blue
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