Class 10 Periodic Classification Of Elements CBSE Questions & Answers

Class 10 · Periodic Classification Of Elements

This is online test 01 for CBSE class 10 Science Periodic Classification of Elements.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
How many groups and periods are present in the modern periodic table?
  • A
    9 groups, 9 periods
  • B
    18 groups, 7 periods
    Correct
  • C
    8 groups, 7 periods
  • D
    7 groups, 7 periods
2
Electropositive character of elements in a period ___________ from left to right
  • A
    Increases
  • B
    decreases
    Correct
  • C
    All of these
  • D
    remains the same
3
How does the valency vary in going down a group?
  • A
    None of these
  • B
    increases
  • C
    remains the same
    Correct
  • D
    decreases
4
An element P belongs to the second period and group 13. What is the formula of its oxide?
  • A
    \({{\rm{P}}_{\rm{2}}}{{\rm{O}}_{\rm{5}}}\)
  • B
    \({{\rm{P}}_{\rm{2}}}{\rm{O}}\)
  • C
    PO
  • D
    \({{\rm{P}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
    Correct
5
What is the nature of an element having atomic number 20?
  • A
    semi metallic
  • B
    metallic
    Correct
  • C
    non metallic
  • D
    metalloid
6
Which group elements are called transition metals?
  • A
    group no 1-8
  • B
    group no 3-10
  • C
    group no 3-12
    Correct
  • D
    group no 1-10
7
What property of all elements in the column of the periodic table as fluorine have in common?
  • A
    All are electronegative elements and have one valiancy
    Correct
  • B
    All have one valiancy
  • C
    All are electropositive
  • D
    All are electronegative elements
8
Which group of periodic table does Ge belongs to ?
  • A
    4 group
    Correct
  • B
    3 group
  • C
    1 group
  • D
    2 group
9
Which elements are called as synthetic elements?
  • A
    beyond atomic number 92
    Correct
  • B
    beyond atomic number 90
  • C
    beyond atomic number 56
  • D
    beyond atomic number 89
10
In Newlands law of octaves elements are arranged in order of
  • A
    increasing atomic mass
    Correct
  • B
    decreasing atomic number
  • C
    decreasing atomic mass
  • D
    increasing atomic number
11
How many elements did Mendeleev classify?
  • A
    60.0
  • B
    92.0
  • C
    61.0
  • D
    63.0
    Correct
12
How many elements are placed in lanthanide and actinide series?
  • A
    14, 16
  • B
    14, 14
    Correct
  • C
    89, 57
  • D
    57, 89
13
Which of the following elements of noble gases participate in chemical reaction?
  • A
    Rn, He
  • B
    He, Kr
  • C
    He, Ne
  • D
    Kr, Rn
    Correct
14
In the modern periodic table which are the metals among the first 10 elements?
  • A
    B, Be
  • B
    Be, C
  • C
    Li, B
  • D
    Li, Be
    Correct
15
Nitrogen and phosphorus belong to the group 15 of the periodic table. Which of these will be more electronegative?
  • A
    None of these
  • B
    Both are equally electronegative
  • C
    Phosphorus
  • D
    Nitrogen
    Correct