Quiz  /  Periodic Classification of Elements Class 10 MCQ Questions With...

  • 1. 
    At the time of Mendeleev, the number of elements known was

  • 62
  • 61
  • 63
  • 56

  • 2. 
    Choose the correct statement from the following:

  • Mendeleev considered oxides and halides made by elements as criteria for classification
  • Newland's law of octaves was valid upto the element vanadium
  • Doberieneer could identify only 5 triads
  • modern periodic table removed the anomaly of position of isotopes

  • 3. 
    EKABORON , EKA ALUMINIUM AND EKA SILICON REPRESENT WHICH OF THE FOLLOWING SETS OF ELEMENTS?

  • SCANDIUM,GALLIUM,GERMANIUM
  • GERMANIUM, SCANDIUM,GALLIUM,
  • GALLIUM,SCANDIUM ,GERMANIUM
  • GALLIUM,GERMANIUM, SCANDIUM

  • 4. 
    Which set of elements in the periodic table are called metalloids?

  • Boron, silicon, germanium, arsenic
  • Antimony, tellurium, polonium
  • Aluminium, gallium, indium
  • Both (a) and (b)

  • 5. 
    Which one of the following statements is not correct about the trends in the properties of the elements of a period on going from left to right?

  • oxides become more acidic
  • the atom gains electrons readily
  • the element becomes more metallic
  • there is increase in no of valence electrons

  • 6. 
    Pick out the chemically most reactive elements from the given set of elementsLi, Na, K F, Cl, Br

  • Li and F
  • Li and Br
  • Na and Cl
  • K and F

  • 7. 
    The chemical properties of calcium (20 Ca) are similar to those of .......................

  • 19K
  • 12Mg
  • 25Mn
  • 3Li

  • 8. 
    2.At the time of Mendeleev, the number of elements known was

  • 63
  • 65
  • 62
  • 64

  • 9. 
    Cl, I if these are the Dobereiner’s triad and the atomic masses of chlorine and the Iodine are 35,5 and 127 respectively. The atomic mass & the particular element is?

  • Ar, 40
  • F,19
  • Br, 81.25
  • At, 210

  • 10. 
    Atoms of elements in group 1 have ____________.

  • one electron in their outermost energy level
  • two electrons in their outermost energy level
  • seven electrons in their outermost energy level
  • eight electrons in their outermost energy level

  • 11. 
    The atoms along the staircase are called

  • metals
  • nonmetals
  • metalloids
  • noble gases

  • 12. 
    In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic Table later?

  • Chlorine
  • Silicon
  • Oxygen
  • Germanium

  • 13. 
    In Mendeleev periodic table,gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic table later

  • Germanium
  • Chlorine
  • Oxygen
  • Silicon

  • 14. 
    A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?

  • (a) MO
  • (b) M2O
  • (C) M2O3
  • (d) MO2

  • 15. 
    Newlands relation is called

  • Musical Law
  • Law of Octaves
  • Periodic Law
  • Atomic Mass Law

  • 16. 
    Dobereiner tried to arrange the elements with similar properties into group. So, he called the groups “_______” Octaves

  • Octaves
  • Triad
  • Metals
  • Non-Metals

  • 17. 
    Noble gases were included in Mendeleev's periodic table in the

  • 1st Group.
  • 7th Group.
  • 8th Group.
  • None of these

  • 18. 
    Chemical formula of rust is ________.

  • FeO.xH2O
  • FeO4.xH2O
  • Fe2O3.xH2O
  • FeO

  • 19. 
    Up to which element,law of octaves found to be applicable

  • Oxygen
  • Calcium
  • Cobalt
  • Potassium

  • 20. 
    The number of periods and groups in theperiodic table are______.

  • 6,16
  • 7,17
  • 8,18
  • 7,18

  • 21. 
    An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong?

  • (a) 4th group
  • (b) 6th group
  • (c) 3rd group
  • (d) 2nd group

  • 22. 
    5.Pick out the chemically most reactive elements from the given triads.

  • (a) Li and F
  • (b) Li and Br
  • (c) K and F
  • (d) K and Br

  • 23. 
    4.The arrangement of elements in the Modem Periodic Table is based on their

  • (a) increasing atomic mass in the period
  • (b) increasing atomic number in the horizontal rows
  • (c) increasing atomic number in the vertical columns
  • (d) increasing atomic mass in the group

  • 24. 
    According to Mendeleev periodic law, the elements were arranged in the Periodic table in order of

  • Increasing atomic number
  • Decreasing atomic number
  • Increasing atomic mass
  • Decreasing atomic mass

  • 25. 
    The arrangement of elements in the Modem Periodic Table is based on their

  • (a) increasing atomic mass in the period
  • (b) increasing atomic number in the horizontal rows
  • (c) increasing atomic number in the vertical columns
  • (d) increasing atomic mass in the group

  • 26. 
    In the second period of periodic table____________ has the largest size.(excluding noble gases Ne)

  • Lithium
  • Both
  • Li
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