CBSE Questions for Class 10 Chemistry Periodic Classification Of Elements Quiz 1 - MCQExams.com

Atomic wt. of P is 31 and Sb isWhat will be the atomic wt. of As, as per Dobernier triad rule?
  • $$151$$
  • $$75.5$$
  • $$89.5$$
  • Unpredictable
Which of the following statements are true about the modern form of the periodic table?
  • Properties of the elements are the periodic functions of their atomic number
  • There are 7 periods
  •  There are 18 numbered groups
  • All of the above
In Dobereiner's triads, atomic weight of the elements in a triad are in increasing order.
  • True
  • False
The electronic configuration of calcium is $$2,\,8,\,8,\,2$$. Find the valency of the element.
  • $$8$$
  • $$2$$
  • $$6$$
  • $$4$$
Identify the element with atomic number 10.
  • Neon
  • Calcium
  • Nitrogen
  • Silicon
An element which is an inert gas with atomic number 2 is :
  • hydrogen
  • argon
  • chlorine
  • helium
How did Mendeleev predict the existence of some elements yet to be discovered elements in his periodic table?
  • Gaps
  • Atomic number
  • Mass number
  • None of the above
Which of the following are the important merits of modern periodic table?
  • It explains why element in the same group have the same chemical properties.
  • Hydrogen has been placed accurately.
  • Isotopes have been placed at same position.
  • It is based on classifying elements according to their atomic number.
State whether the given statement is true or false:

Magnesium is more metallic in nature than sodium.
  • True
  • False
In the first two groups of periodic table, the group number represents the :
  • Valency
  • Atomic weight
  • Atomic number
  • Electronegativity 
The number of elements known in Mendeleev's presented periodic table is:
  • $$50$$
  • $$90$$
  • $$63$$
  • $$102$$
Total number of groups in Mendeleev's table are:
  • $$8$$
  • $$9$$
  • $$7$$
  • $$10$$
Eka silicon is now called as:
  • gallium
  • scandium
  • germanium
  • indium
Cl, Br, I  follows Dobereiner's triads, the atomic masses of Cl and I are 35.5 and 127 respectively. The atomic mass of Br is : 
  • 162.5
  • 91.5
  • 81.25
  • 45.625
The arrangement of elements in a group of three was done by Döbereiner.
  • True
  • False
Elements in a period have same :
  • number of valence electrons
  • valency
  • number of shells
  • volume
The law of octaves was proposed by :
  • Newlands
  • Dobereiner
  • Lavoisier
  • Mendeleev
The group in which all the elements do not have same number electrons in their valence shell is :
  • zero
  • second
  • first
  • seventh
Which of the following sets of atomic masses do not correspond to Dobereiner's triad?
  • 7, 23, 39
  • 20, 38, 56
  • 47, 91, 178
  • 54, 95, 183
Modern periodic law was proposed by :
  • Dmitri Mendeleev
  • Henry Moseley
  • J.A.R. Newlands
  • Niels Bohr 
Non-metallic character ________ down the group.
  • increases
  • decreases
  • constant
  • none of these
The early attempt to classify elements as metals and non-metals was made by :
  • Mendeleev
  • Newlands
  • Lavoisier
  • Henry Moseley
What happens to the number of valence electrons in atoms of elements as we go down a group in the periodic table?
  • Increases
  • Decreases
  • Remain same
  • None of these
In Newlands classification, elements are arranged in an increasing order of their:
  • mass number
  • atomic number
  • atomic weight
  • all of these
The eighth group of Mendeleev's periodic table is divided into how many subgroups?
  • $$2$$
  • $$0$$
  • $$4$$
  • $$1$$
What were the limitations of Newlands' classification?
  • It was applicable only for lighter elements
  • He adjusted two elements on the same place
  • The pattern was only observed up to calcium
  • All of the above
The horizontal rows in Mendleev's table were called :
  • groups
  • rows
  • periods
  • none of the above
The placement of elements in the Newlands' table was compared to:
  • weeks of a month
  • notes of music
  • months of a year
  • days of a month
The vertical columns in Mendeleev's table were called :
  • verticals
  • periods
  • columns
  • groups
John Newland arranged the element starting with hydrogen and ending at _______.
  • cerium
  • calcium
  • thorium
  • rubidium
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