Class 10 Periodic Classification Of Elements CBSE Questions & Answers

Class 10 · Periodic Classification Of Elements

This is online test 03 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
Elements hewing same valence electrons are placed in same group but there is an exception with-
  • A
    He
    Correct
  • B
    Ne
  • C
    Xe
  • D
    Ar
2
P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?
  • A
    15.0
  • B
    40.0
  • C
    39.0
    Correct
  • D
    30.0
3
Which element was discovered after Mendeleev gave the periodic table?
  • A
    Gallium
    Correct
  • B
    manganese
  • C
    Aluminium
  • D
    tantalum
4
An element with atomic no 3 combines with another elements with atomic number 17, What would be the formulae of the compound?
  • A
    NaCl
  • B
    \({\rm{BeC}}{{\rm{l}}_{\rm{2}}}\)
  • C
    Lif
  • D
    LiCl
    Correct
5
Horizontal rows in a periodic table are called-
  • A
    Columns
  • B
    Period
    Correct
  • C
    Group
  • D
    None of these.
6
Which element has two shells both of which are completely filled with electrons?
  • A
    Ne
    Correct
  • B
    Na
  • C
    H
  • D
    He
7
Answer the questions on the basis of the following table, Which element is the most metallic?
Question 7 figure 1
  • A
    C
    Correct
  • B
    H
  • C
    B
  • D
    D
8
Answer the questions on the basis of the following table, Which atom is the largest?
Question 8 figure 1
  • A
    D
  • B
    C
    Correct
  • C
    B
  • D
    He
9
Answer the questions on the basis of the following table, Which element is highly electronegative?
Question 9 figure 1
  • A
    D
  • B
    B
    Correct
  • C
    A
  • D
    H
10
Answer the questions on the basis of the following table, Name the family of H, A, C.
Question 10 figure 1
  • A
    alkaline earth metal
  • B
    Noble
  • C
    Halogen
  • D
    Alkali
    Correct
11
Element A forms a chloride with the formula \({\rm{AC}}{{\rm{l}}_{\rm{2}}}\) , Which is solid with a high melting point, A would most likely to be in the same group of the periodic table as
  • A
    Mg
    Correct
  • B
    Si
  • C
    Al
  • D
    Na
12
Which of the following statement is not a correct statement about the trends when going from left to right across the periodic table.
  • A
    The elements become less metallic in nature
  • B
    The oxides become more acidic
  • C
    The number of valence electrons increases
  • D
    The atoms lose their electrons more easily
    Correct
13
By considering their position in the periodic table which one of the following elements would you expect to have maximum metallic characteristics?
  • A
    Ga
  • B
    Ge
  • C
    Be
    Correct
  • D
    As
14
Which one of the following is the most reactive?
  • A
    Bromine
  • B
    Flourine
    Correct
  • C
    Chlorine
  • D
    Iodine
15
Which of the following elements can be classified into group of triad
  • A
    Cl, Ca, Br
  • B
    Sr, Ca, Br
  • C
    Na, Cl, K
  • D
    Cl, Br, I
    Correct