Nitric acid is added to sodium extract before adding silver nitrate for testing halogens because
1. Nitric acid reduces suphide
2. Nitric acid decomposes NaCN and Na2S
3. Nitric acid oxidises the organic compound
4. Nitric acid acts as a dehydrating agent
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe reason why we fuse an organic compound with metallic sodium for testing nitrogen, sulphur, and halogens is -
1. To convert all compounds to their ionic form
2. Sodium reduces the compounds
3. Sodium converts all compounds in their covalent form
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA mixture of calcium sulphate and camphor can be separated by-
1. Filtration
2. Evaporation
3. Sublimation
4. Chromatography
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA gas among the following that can be absorbed by potassium hydroxide is -
1. Carbon dioxide
2. Silicon dioxide
3. Hydrogen
4. Carbon monoxide
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology0.3780 grams of an organic chloro compound gave 0.5740 grams of silver chloride in Carius
estimation. % of chlorine present in the compound is -
1. 25%
2. 37.59%
3. 42%
4. 05.70 %
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the Carius method, 0.468 grams of an organic sulphur compound gives 0.668 grams of barium sulphate. The percentage of sulphur in the given compound is -
1. 19.59%
2. 25.40%
3. 09.24%
4. 27.59%
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe most stable carbocation among the following is-
1. \(({CH_3})_3C\overset{+}{C}H_2\)
2. \(({CH_3})_3\overset{+}{C}\)
3. \({CH_3}CH_2\overset{+}{C}H_2\)
4. \(({CH_3})\overset{+}{C}HCH_2CH_3\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biologyis more stable than because -
1. NO2 shows +I effect
2. NO2 shows -I effect
3. NO2 decreases the positive charge on the compound
4. Ethyl group increases positive charge on the compound
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAlkyl groups act as electron donors when attached to a π system due to-
1. Inductive effect
2. Mesomeric effect
3. Resonance
4. Hyperconjugation
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn electrophile among the following is -
1.
2.
3.
4. Carbonyl group
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology