Question

The function of granulated zinc in the limit test for arsenic is __
A. Low and prolong evolution of nascent hydrogen gas

B. High and prolong evolution of nascent hydrogen gas

C. Low and prolong evolution of nascent nitrogen gas

D. High and prolong evolution of nascent nitrogen gas​

Answer 1

Answer:

High and prolong evolution of nascent Nitrogen gas

Option D

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Answer 2

The correct answer is option (D.) High and prolong evolution of nascent nitrogen gas​.

Explanation:

• The function of granulated zinc in the limit test for arsenic is High and prolong evolution of nascent nitrogen gas​.
• Zinc, potassium iodide and stannous chloride is used as a reducing agent. Hydrochloride acid is used to make the solution acidic. hydrogen sulphide, which may be evolved along with arsine.
• Granulated zinc gives more surface area for the acid to act, so hydrogen is formed faster. Also, granulated zinc has copper as an impurity, which catalyses the reaction.