JEE Main Bonding & Periodicity: Chemical Bonding and Molecular Structure – Chapter Test
JEE Main Bonding & Periodicity: Chemical Bonding and Molecular Structure – Chapter Test is an online chapter test in the JEE Main pattern, covering Bonding & Periodicity. 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 |
|---|---|
| Bonding & Periodicity | 20 |
Difficulty: 10 medium · 10 hard
Chemical Bonding and Molecular Structure MCQ questions with answers
The first 3 of 20 questions. Unlock the series for the rest, each with a solution.
Q1. Which one of the following molecules has a net dipole moment of zero?
निम्नलिखित में से किस अणु का निवल द्विध्रुव आघूर्ण (net dipole moment) शून्य है?
- A. NH3
- B. NF3
- C. PH3
- D. BF3
Solution
BF3 is trigonal planar (sp2) with three identical B–F dipoles at 120° that cancel exactly, giving zero net dipole; NF3, NH3 and PH3 are pyramidal and polar.
BF3 त्रिकोणीय समतलीय (sp2) है जिसमें तीन समान B–F द्विध्रुव 120° पर होते हैं जो पूर्णतः निरस्त हो जाते हैं, जिससे निवल द्विध्रुव शून्य होता है; NF3, NH3 और PH3 पिरामिडीय तथा ध्रुवीय हैं।
Q2. According to Fajans' rules, which of the following chlorides is expected to have the greatest covalent character?
फाजान्स के नियमों (Fajans' rules) के अनुसार, निम्नलिखित में से किस क्लोराइड में सर्वाधिक सहसंयोजक गुण (covalent character) की अपेक्षा की जाती है?
- A. SiCl4
- B. MgCl2
- C. NaCl
- D. AlCl3
Solution
Across the period the cation charge rises and size falls, so polarising power increases; SiCl4 (small, highly charged Si4+) is essentially a molecular covalent chloride, the most covalent of the set.
आवर्त में धनायन का आवेश बढ़ता है और आकार घटता है, अतः ध्रुवण क्षमता बढ़ती है; SiCl4 (छोटा, उच्च आवेशित Si4+) मूलतः एक आण्विक सहसंयोजक क्लोराइड है, जो इस समूह में सर्वाधिक सहसंयोजक है।
Q3. According to Fajans' rules, which of the following chlorides is expected to have the greatest covalent character?
फेजान्स के नियमों के अनुसार, निम्नलिखित में से किस क्लोराइड में सर्वाधिक सहसंयोजी गुण होने की अपेक्षा है?
- A. AlCl3
- B. KCl
- C. NaCl
- D. MgCl2
Solution
AlCl3 has the smallest, most highly charged cation (Al3+), giving it the highest polarizing power and hence the greatest covalent character among these chlorides.
AlCl3 में सबसे छोटा तथा अत्यधिक आवेशित धनायन (Al3+) होता है, जिससे इसकी ध्रुवण क्षमता सर्वाधिक होती है और अतः इन क्लोराइडों में इसमें सर्वाधिक सहसंयोजी गुण होता है।
Frequently asked questions
How many questions are in the JEE Main Bonding & Periodicity: Chemical Bonding and Molecular Structure – Chapter Test?
20 questions for 20 marks, to be answered in 20 minutes.
Is there negative marking in the JEE Main Bonding & Periodicity: Chemical Bonding and Molecular Structure – Chapter Test?
Yes — 0.25 marks are deducted for each wrong answer, as in the real exam pattern.
Which topics does the JEE Main Bonding & Periodicity: Chemical Bonding and Molecular Structure – Chapter Test cover?
Bonding & Periodicity (20 questions).
Is the JEE Main Bonding & Periodicity: Chemical Bonding and Molecular Structure – 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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