alleryWhat cation is indicated when NH4OH produces a reddish-brown hydroxide precipitate?
- Zn2+
- Al3+
- Cr3+
- Fe3+
Show answer and solution
Correct answer: D. Fe3+
A reddish-brown precipitate is characteristic of Fe3+ in this test.
ICSE Class 10 Analytical Chemistry — practice questions
Explore 61 free Analytical Chemistry questions in ICSE Class 10 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
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What cation is indicated when NH4OH produces a reddish-brown hydroxide precipitate?Read the answer and worked solution →An unknown gives a gelatinous white solid after NH4Cl and NH4OH are added. Which cation is indicated?Read the answer and worked solution →A green hydroxide precipitate dissolves when excess sodium hydroxide is added. Which ion is indicated?Read the answer and worked solution →Which reagent distinguishes green Cr3+ and Fe2+ precipitates by dissolving the chromium compound?Read the answer and worked solution →What does ammonium chloride do in this hydroxide test?Read the answer and worked solution →Which cation gives a white precipitate in the sulfide-group test?Read the answer and worked solution →Which cation is associated with a blue hydroxide precipitate in a common salt test?Read the answer and worked solution →Excess ammonia dissolves a pale-blue precipitate into a deep-blue solution. Which ion is present?Read the answer and worked solution →Which metal hydroxide is amphoteric and dissolves in excess sodium hydroxide?Read the answer and worked solution →What is the formula of zinc hydroxide?Read the answer and worked solution →Which formula represents the precipitate formed when Zn2+ ions combine with hydroxide ions?Read the answer and worked solution →What property lets a hydroxide dissolve in excess NaOH?Read the answer and worked solution →What happens to iron(II) hydroxide exposed to oxygen?Read the answer and worked solution →Sodium ions give a bright yellow flame. What color do potassium ions produce?Read the answer and worked solution →Which cation corresponds to a brick-red flame?Read the answer and worked solution →Which ion gives a yellow-green flame?Read the answer and worked solution →Which flame color is associated with strontium ions?Read the answer and worked solution →What is characteristic of an element in a flame test?Read the answer and worked solution →During a flame test, what happens after ions are heated?Read the answer and worked solution →Why might sodium mask another flame-test color?Read the answer and worked solution →Which is a limitation of flame tests?Read the answer and worked solution →A salt effervesces with dilute acid and the gas turns limewater milky. Which anion is indicated?Read the answer and worked solution →Which gas is released when a carbonate reacts with dilute acid?Read the answer and worked solution →What causes limewater to turn milky in the carbonate test?Read the answer and worked solution →A salt reacts with dilute acid to release a gas with a rotten-egg smell. Which anion is suspected?Read the answer and worked solution →Which confirmatory paper turns black in the presence of hydrogen sulfide from a sulfide test?Read the answer and worked solution →A dilute-acid test produces sulfur dioxide. Which anion does this support?Read the answer and worked solution →In the sulfite test, what color change occurs in acidified potassium dichromate?Read the answer and worked solution →Which gas is associated with a burning-sulfur smell in the dilute-acid test?Read the answer and worked solution →A sulfide is treated with dilute acid. Which gas is formed?Read the answer and worked solution →
Worked practice questions
An unknown gives a gelatinous white solid after NH4Cl and NH4OH are added. Which cation is indicated?
- Cu2+
- Al3+
- Fe3+
- Fe2+
Show answer and solution
Correct answer: B. Al3+
Al3+ gives the gelatinous white hydroxide precipitate in this test.
A green hydroxide precipitate dissolves when excess sodium hydroxide is added. Which ion is indicated?
- Fe2+
- Fe3+
- Cr3+
- Al3+
Show answer and solution
Correct answer: C. Cr3+
In this test, excess sodium hydroxide dissolves the green precipitate of Cr3+ but not that of Fe2+.
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