Rubidium (Z = 37): which compound/reagent and distinguishing chemical test is characteristic of rubidium?

Rubidium hydride (RbH); is detected by the Marsh test

Rubidium carbonate (Rb2CO3); forms a white precipitate with AgNO3

Rubidium chloride (RbCl); rubidium salts give a violet (purple) flame test

Rubidium oxide (Rb2O); gives a crimson flame test

Zirconium (Z = 40): which compound and distinguishing chemical reaction/test is characteristic of zirconium?

Zirconium hydride (ZrH2); produces a cream precipitate with AgNO3

Zirconium dioxide (ZrO2); the common stable oxide of Zr and basis of many chemical identifications

Zirconium sulfide (ZrS2); forms a black mirror with H2S

Zirconium tetrachloride (ZrCl4); gives a purple flame test

Krypton (Z = 36): which characteristic compound and distinguishing reaction is associated with krypton?

Krypton oxide (KrO3); produced by ozone oxidation at room temperature

Krypton hydride (KrH); forms a stable hydride detected by silver nitrate

Krypton chloride (KrCl); a common ionic krypton salt precipitate

Krypton difluoride (KrF2); a rare chemically bound krypton compound formed by fluorination

Yttrium (Z = 39): which compound and a commonly cited identifying property/test is characteristic of yttrium?

Yttrium hydride (YH3); produces a red precipitate with silver nitrate

Yttrium oxide (Y2O3); a stable oxide used in phosphors and ceramics (Y3+ chemistry and oxide formation are characteristic)

Yttrium chloride (YCl); gives a green flame test unique to yttrium

Yttrium sulfide (YS); detected by the Marsh test

Germanium (Z = 32): which compound and distinguishing reagent/test is characteristic of germanium?

Germanium nitrate; precipitates as a black salt with silver

Germane (GeH4); used as an inert calibration gas

Germanium sulfide (GeS); gives a crimson flame test

Germanium dioxide (GeO2); used as the common inorganic oxide of Ge

Bromine (Z = 35): which compound/reagent and distinguishing chemical test is characteristic of bromine (as bromide)?

Hydrogen bromide (HBr); bromides give a red solution with phenolphthalein

Bromoform (CHBr3); bromides ignite with Na

Bromine trifluoride (BrF3); bromides give a blue precipitate with Pb(NO3)2

Liquid bromine (Br2); bromides give a cream precipitate with AgNO3

Gallium (Z = 31): which compound and distinguishing property/test is characteristic of gallium?

Gallium hydride (GaH3); produces a stench on decomposition

Gallium(III) sulfate; gives a green flame test

Gallium arsenide (GaAs); notable as a semiconductor compound

Gallium nitride (GaN); forms a yellow precipitate with chloride

Strontium (Z = 38): which compound/reagent and distinguishing test is characteristic of strontium?

Strontium oxide (SrO); yields a blue precipitate with HCl

Strontium fluoride (SrF2); gives a violet flame

Strontium chloride (SrCl2); strontium salts give a crimson red flame test

Strontium carbonate (SrCO3); dissolves to give a metallic sheen with NH3

Arsenic (Z = 33): which compound and classic qualitative test is characteristic of arsenic?

Arsenic pentafluoride (AsF5); gives a blue flame test

Arsenic metal; identified by a green precipitate with AgNO3

Arsine oxide; forms a white precipitate with HCl

Arsenic trioxide (As2O3); detected by the Marsh test (generation of arsine)

Selenium (Z = 34): which compound and distinguishing reaction/test is characteristic of selenium?

Selenium tetrachloride (SeCl4); readily forms a black mirror in the Marsh test

Selenic acid (H2SeO4); gives a violet flame test

Selenide (Se2-); produces a green precipitate with AgNO3

Selenium dioxide (SeO2); selenium can be identified by formation of red elemental selenium on reduction

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Compounds and Characteristic Chemical Tests for 31–40: Multiple Choice

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01Rubidium (Z = 37): which compound/reagent and distinguishing chemical test is characteristic of rubidium?
02Zirconium (Z = 40): which compound and distinguishing chemical reaction/test is characteristic of zirconium?
03Krypton (Z = 36): which characteristic compound and distinguishing reaction is associated with krypton?
04Yttrium (Z = 39): which compound and a commonly cited identifying property/test is characteristic of yttrium?
05Germanium (Z = 32): which compound and distinguishing reagent/test is characteristic of germanium?
06Bromine (Z = 35): which compound/reagent and distinguishing chemical test is characteristic of bromine (as bromide)?
07Gallium (Z = 31): which compound and distinguishing property/test is characteristic of gallium?
08Strontium (Z = 38): which compound/reagent and distinguishing test is characteristic of strontium?
09Arsenic (Z = 33): which compound and classic qualitative test is characteristic of arsenic?
10Selenium (Z = 34): which compound and distinguishing reaction/test is characteristic of selenium?