Virtual Labs

If in Lassaigne’s test, Silver nitrate reacts with Lassaigne’s extract to give white precipitate that is soluble in Ammonium hydroxide, it indicates the presence of

a: Iodine Explanation

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b: Bromine Explanation

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c: Chlorine Explanation

Explanation

d: Fluorine Explanation

Explanation

The ionic compound formed during the fusion of 1,2-Dichloro benzene with sodium metal is

a: NaCl Explanation

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b: Na₂S Explanation

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c: NaCN Explanation

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d: AgCl Explanation

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The element which cannot be detected through Lassaigne’s test is

a: S Explanation

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b: Cl Explanation

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c: O Explanation

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d: N Explanation

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What is the role of sodium metal in Lassaigne’s test?

a: It acts as a reducing agent Explanation

Explanation

b: It converts covalent compounds to ionic form Explanation

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c: It neutralizes acidic impurities Explanation

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d: It decomposes water Explanation

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The appearance of a blood red coloration during Lassaigne’s test indicates the presence of:

a: Sulphur only Explanation

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b: Nitrogen only Explanation

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c: Both nitrogen and sulphur Explanation

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d: Chlorine Explanation

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Which of the following is not a step in the preparation of Lassaigne’s extract?

a: Fusion of compound with metallic sodium Explanation

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b: Dipping hot ignition tube in water Explanation

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c: Filtering the aqueous mixture Explanation

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d: Reacting extract with concentrated H₂SO₄ Explanation

Explanation

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