JEE Main Organic — Fundamentals & Hydrocarbons: Purification and Characterisation of Organic Compounds – Chapter Test
JEE Main Organic — Fundamentals & Hydrocarbons: Purification and Characterisation of Organic Compounds – Chapter Test is an online chapter test in the JEE Main pattern, covering Organic — Fundamentals & Hydrocarbons. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.
Topics in this test
| Topic | Questions |
|---|---|
| Organic — Fundamentals & Hydrocarbons | 18 |
Difficulty: 4 medium · 14 hard
Purification and Characterisation of Organic Compounds MCQ questions with answers
The first 3 of 18 questions. Unlock the series for the rest, each with a solution.
Q1. In Lassaigne's test, the violet colouration obtained on adding sodium nitroprusside to the fusion extract (indicating sulphur) is due to the formation of:
लासेन परीक्षण में, संगलन निष्कर्ष में सोडियम नाइट्रोप्रसाइड मिलाने पर प्राप्त बैंगनी रंग (जो सल्फर का सूचक है) किसके बनने के कारण होता है?
- A. Fe(SCN)3
- B. Na2[Fe(CN)5NO]
- C. Na4[Fe(CN)5NOS]
- D. Fe4[Fe(CN)6]3
Solution
Sulphide ion reacts with sodium nitroprusside Na2[Fe(CN)5NO] to give the violet complex Na4[Fe(CN)5NOS].
सल्फाइड आयन सोडियम नाइट्रोप्रसाइड Na2[Fe(CN)5NO] के साथ अभिक्रिया करके बैंगनी संकुल Na4[Fe(CN)5NOS] देता है।
Q2. Which one of the following is NOT ordinarily purified by sublimation?
निम्नलिखित में से किसे सामान्यतः ऊर्ध्वपातन द्वारा शुद्ध नहीं किया जाता?
- A. Camphor / कपूर
- B. Glycerol / ग्लिसरॉल
- C. Naphthalene / नेफ्थलीन
- D. Benzoic acid / बेंजोइक अम्ल
Solution
Naphthalene, camphor and benzoic acid sublime readily; glycerol is a high-boiling liquid that decomposes near its boiling point and is purified by distillation under reduced pressure, not sublimation.
नेफ्थलीन, कपूर तथा बेंजोइक अम्ल सरलता से ऊर्ध्वपातित होते हैं; ग्लिसरॉल एक उच्च-क्वथनांक वाला द्रव है जो अपने क्वथनांक के निकट अपघटित हो जाता है और इसे न्यून दाब पर आसवन द्वारा शुद्ध किया जाता है, ऊर्ध्वपातन द्वारा नहीं।
Q3. Crystallisation as a method of purification is based essentially on the difference in:
शुद्धिकरण की विधि के रूप में क्रिस्टलीकरण मूलतः किस अंतर पर आधारित है?
- A. Densities of the compound and the impurity / यौगिक तथा अशुद्धि के घनत्व
- B. Vapour pressures of the compound and the impurity in steam / भाप में यौगिक तथा अशुद्धि के वाष्प दाब
- C. Solubilities of the compound and the impurity in a suitable solvent / किसी उपयुक्त विलायक में यौगिक तथा अशुद्धि की विलेयताएँ
- D. Boiling points of the compound and the impurity / यौगिक तथा अशुद्धि के क्वथनांक
Solution
Crystallisation separates a compound from impurities using the difference in their solubilities in a suitable solvent, usually across temperature; it is not based on boiling point or density differences.
क्रिस्टलीकरण किसी यौगिक को अशुद्धियों से उनकी किसी उपयुक्त विलायक में विलेयताओं के अंतर का उपयोग करके पृथक करता है, सामान्यतः तापमान के साथ; यह क्वथनांक या घनत्व के अंतर पर आधारित नहीं है।
Frequently asked questions
How many questions are in the JEE Main Organic — Fundamentals & Hydrocarbons: Purification and Characterisation of Organic Compounds – Chapter Test?
18 questions for 18 marks, to be answered in 20 minutes.
Is there negative marking in the JEE Main Organic — Fundamentals & Hydrocarbons: Purification and Characterisation of Organic Compounds – Chapter Test?
Yes — 0.25 marks are deducted for each wrong answer, as in the real exam pattern.
Which topics does the JEE Main Organic — Fundamentals & Hydrocarbons: Purification and Characterisation of Organic Compounds – Chapter Test cover?
Organic — Fundamentals & Hydrocarbons (18 questions).
Is the JEE Main Organic — Fundamentals & Hydrocarbons: Purification and Characterisation of Organic Compounds – Chapter Test free?
It is part of the JEE Main 2027 Mock Test Series (104 tests, ₹299). You can first try Basic Concepts & Atomic Structure – Topic Test for free.
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