CBSE Class 11 Science Chemistry · Ch 3: Classification of Elements and Periodicity in Properties
CBSE Class 11 Science Chemistry · Ch 3: Classification of Elements and Periodicity in Properties is an online chapter test in the CBSE Class 11 Science pattern, covering Classification of Elements and Periodicity in Properties. 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 |
|---|---|
| Classification of Elements and Periodicity in Properties | 30 |
Difficulty: 7 medium · 23 hard
Classification of Elements and Periodicity in Properties MCQ questions with answers
The first 3 of 30 questions. Unlock the series for the rest, each with a solution.
Q1. Three of the following element pairs show a diagonal relationship in the periodic table. Pick the odd one out — the pair that does NOT exhibit a diagonal relationship:
निम्नलिखित में से तीन तत्व युग्म आवर्त सारणी में विकर्ण संबंध दर्शाते हैं। विषम युग्म चुनिए — वह युग्म जो विकर्ण संबंध प्रदर्शित नहीं करता:
- A. Be and Al / Be और Al
- B. B and Si / B और Si
- C. Na and Mg / Na और Mg
- D. Li and Mg / Li और Mg
Solution
Diagonal relationships connect an element to the one diagonally below-right in the next period, as in Li–Mg, Be–Al and B–Si. Na and Mg are neighbours in the same period, so they do not form a diagonal pair.
विकर्ण संबंध किसी तत्व को अगले आवर्त में विकर्णतः नीचे-दाईं ओर स्थित तत्व से जोड़ते हैं, जैसे Li–Mg, Be–Al और B–Si। Na और Mg एक ही आवर्त में पड़ोसी हैं, अतः वे विकर्ण युग्म नहीं बनाते।
Q2. An element has atomic number 26. Based on its ground-state electronic configuration, the group to which it belongs is:
एक तत्व का परमाणु क्रमांक 26 है। इसके मूल अवस्था इलेक्ट्रॉनिक विन्यास के आधार पर, यह जिस समूह से संबंधित है वह है:
- A. Group 8 / समूह 8
- B. Group 16 / समूह 16
- C. Group 2 / समूह 2
- D. Group 6 / समूह 6
Solution
The configuration is $[Ar]\,3d^{6}\,4s^{2}$, a d-block element whose group number equals the sum of $(n-1)d$ and $ns$ electrons, i.e. $6 + 2 = 8$. Hence it is in Group 8, period 4.
इसका विन्यास $[Ar]\,3d^{6}\,4s^{2}$ है, जो एक d-ब्लॉक तत्व है जिसकी समूह संख्या $(n-1)d$ और $ns$ इलेक्ट्रॉनों के योग के बराबर होती है, अर्थात् $6 + 2 = 8$। अतः यह समूह 8, आवर्त 4 में है।
Q3. Consider the following statements about periodic trends: (i) Atomic radius decreases across a period from left to right. (ii) Ionization enthalpy increases down a group. (iii) Electronegativity increases across a period. (iv) Metallic character increases down a group. The correct statements are:
आवर्ती प्रवृत्तियों के विषय में निम्नलिखित कथनों पर विचार कीजिए: (i) एक आवर्त में बाएँ से दाएँ परमाणु त्रिज्या घटती है। (ii) एक समूह में नीचे की ओर आयनन एन्थैल्पी बढ़ती है। (iii) एक आवर्त में विद्युतऋणात्मकता बढ़ती है। (iv) एक समूह में नीचे की ओर धात्विक गुण बढ़ता है। सही कथन हैं:
- A. (i), (iii) and (iv) / (i), (iii) और (iv)
- B. (i), (ii) and (iii) / (i), (ii) और (iii)
- C. (i), (ii) and (iv) / (i), (ii) और (iv)
- D. (ii), (iii) and (iv) / (ii), (iii) और (iv)
Solution
Across a period, rising effective nuclear charge makes (i) and (iii) true, and down a group metallic character rises, so (iv) is true. Statement (ii) is wrong because ionization enthalpy decreases down a group as size increases.
एक आवर्त में बढ़ता प्रभावी नाभिकीय आवेश (i) और (iii) को सत्य बनाता है, और समूह में नीचे की ओर धात्विक गुण बढ़ता है, अतः (iv) सत्य है। कथन (ii) गलत है क्योंकि समूह में नीचे की ओर आकार बढ़ने के साथ आयनन एन्थैल्पी घटती है।
Frequently asked questions
How many questions are in the CBSE Class 11 Science Chemistry · Ch 3: Classification of Elements and Periodicity in Properties?
30 questions for 30 marks, to be answered in 20 minutes.
Is there negative marking in the CBSE Class 11 Science Chemistry · Ch 3: Classification of Elements and Periodicity in Properties?
No — wrong answers are not penalised in this test.
Which topics does the CBSE Class 11 Science Chemistry · Ch 3: Classification of Elements and Periodicity in Properties cover?
Classification of Elements and Periodicity in Properties (30 questions).
Is the CBSE Class 11 Science Chemistry · Ch 3: Classification of Elements and Periodicity in Properties free?
It is part of the CBSE Class 11 Science Test Series 2027 — Chapter-wise + Full Tests (36 tests, ₹199). You can first try Biology · Ch 1: The Living World for free.
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