Question:
The principle of the limit test for Arsenic is based on the Gutzeit test, where a yellow stain is produced on
The principle of the limit test for Arsenic is based on the Gutzeit test, where a yellow stain is produced on
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The limit test for arsenic checks that the amount of arsenic in a sample is below an allowed limit. It uses the Gutzeit reaction, where arsenic is turned into arsine gas and detected on a special test paper.
Updated On: Jun 24, 2026
- Lead acetate paper
- Mercuric chloride paper
- Filter paper
- Silver nitrate paper
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The Correct Option is B
Solution and Explanation
Concept:
The limit test for arsenic checks that the amount of arsenic in a sample is below an allowed limit. It uses the Gutzeit reaction, where arsenic is turned into arsine gas and detected on a special test paper.
Step 1: In the test, arsenic compounds are reduced (using zinc and acid) to arsine gas (AsH3).
Step 2: The arsine gas rises and reacts with paper impregnated with mercuric chloride (HgCl2). This reaction produces a yellow to brown stain whose intensity is compared with a standard to judge the arsenic content.
Why the others are wrong: Lead acetate paper is used earlier in the apparatus to trap any hydrogen sulphide, not to detect arsenic. Plain filter paper and silver nitrate paper are not the detecting medium in the Gutzeit test. The yellow stain forms on mercuric chloride paper.
Answer: Option (2) — Mercuric chloride paper.
The limit test for arsenic checks that the amount of arsenic in a sample is below an allowed limit. It uses the Gutzeit reaction, where arsenic is turned into arsine gas and detected on a special test paper.
Step 1: In the test, arsenic compounds are reduced (using zinc and acid) to arsine gas (AsH3).
Step 2: The arsine gas rises and reacts with paper impregnated with mercuric chloride (HgCl2). This reaction produces a yellow to brown stain whose intensity is compared with a standard to judge the arsenic content.
Why the others are wrong: Lead acetate paper is used earlier in the apparatus to trap any hydrogen sulphide, not to detect arsenic. Plain filter paper and silver nitrate paper are not the detecting medium in the Gutzeit test. The yellow stain forms on mercuric chloride paper.
Answer: Option (2) — Mercuric chloride paper.
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