CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES - MCQs

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Chemistry — CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

50 Questions Class 11 MCQs
1
Who proposed the first scientific classification of elements?
(Class XI)
2
Dobereiner’s triads failed mainly because:
(Class XI)
3
In Newlands’ Law of Octaves, properties repeat after every:
(Class XI)
4
Which element violates Newlands’ octave?
(Class XI)
5
Modern periodic law is based on:
(Class XI)
6
Number of periods in modern periodic table:
(Class XI)
7
Number of groups:
(Class XI)
8
Alkali metals belong to group:
(Class XI)
9
Halogens belong to:
(Class XI)
10
Noble gases have valency:
(Class XI)
11
Atomic radius decreases across a period due to:
(NEET)
12
Atomic radius increases down a group because:
(NEET)
13
Element with highest electronegativity:
(Class XI)
14
First ionization energy increases:
(NEET)
15
Which has highest IE1?
(NEET)
16
Metallic character:
(Class XI)
17
Most metallic element:
(JEE)
18
Electron affinity is highest for:
(NEET)
19
Which is smallest?
(Class XI)
20
Isoelectronic species among following:
(JEE)
21
Order of increasing radius:
(JEE)
22
Periodicity arises due to:
(Class XI)
23
Which shows diagonal relationship?
(Class XI)
24
Which is amphoteric?
(NEET)
25
Highest oxidation state shown by halogens:
(Class XI)
26
Element with configuration \(ns^2np^5\):
(Class XI)
27
Which has maximum polarizing power?
(JEE)
28
Most basic oxide:
(JEE)
29
Order of electronegativity:
(JEE)
30
Which is metalloid?
(Class XI)
31
Highest hydration energy:
(JEE)
32
Which pair is isoelectronic?
(JEE)
33
Correct order of IE1:
(JEE)
34
Largest atom:
(JEE)
35
Least reactive halogen:
(Class XI)
36
Strongest oxidizing halogen:
(NEET)
37
Maximum covalent character:
(JEE)
38
s-block elements end with:
(Class XI)
39
Lanthanides belong to:
(Class XI)
40
Which has highest electron affinity?
(JEE)
41
Atomic volume shows periodicity because:
(JEE)
42
Correct order of metallic character:
(JEE)
43
Which is strongest base?
(JEE)
44
Most acidic oxide:
(JEE)
45
Maximum covalent radius:
(JEE)
46
Element with highest charge density:
(JEE)
47
Which pair shows diagonal relationship?
(JEE)
48
Most stable noble gas compound:
(JEE)
49
Periodic properties repeat because:
(JEE Advanced)
50
Correct increasing order of IE1:
(JEE Advanced)
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Frequently Asked Questions

It is the systematic arrangement of elements so that similar properties recur periodically with atomic number.

The properties of elements are periodic functions of their atomic numbers \(Z\).

The modern periodic table is based on Moseley’s atomic number concept.

There are 7 horizontal periods.

There are 18 vertical groups.

It is the number of protons in the nucleus, denoted by \(Z\).

Regular repetition of properties after fixed intervals of atomic number.

Elements belonging to groups 1, 2, and 13–18.

Elements of d-block (groups 3–12).

f-block elements: lanthanoids and actinoids.

\(Z_{eff}=Z-\sigma\)

Half the distance between nuclei of two bonded atoms.

Decreases left to right.

Increases top to bottom.

Energy required to remove outermost electron from gaseous atom.

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