CBSE Class 11 Chemistry Classification of Elements and Periodicity in Properties MCQs


Question: Periodic classification of elements is used to examine the

  • a) Both
  • b) periodic trends in physical properties of elements
  • c) periodic trends in chemical properties of elements
  • d) None of these

Answer: Both


Question: Cl, Br, I, if this is Dobereiner’s triad and the atomic masses of Cl and I are 35.5 and 127 respectively the atomic mass of Br is

  • a) 81.25
  • b) 162.5
  • c) 91.5
  • d) 45.625

Answer: 81.25


Question: If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is

  • a) arsenic
  • b) iodine
  • c) sulphur
  • d) calcium

Answer: arsenic


Question: The law of triads is applicable to a group of

  • a) Cl, Br, I
  • b) Na, K, Rb
  • c) C, N, O
  • d) H, O, N

Answer: Cl, Br, I


Question: In 1800, only _____X _____ elements were known. Here, X refers to

  • a) 31
  • b) 92
  • c) 63
  • d) None of these

Answer: 31


Question: Johann Doberiner gave the idea of trends among physical and ...X... of several groups of three elements. Here, X refers to

  • a) chemical properties
  • b) atomic number
  • c) atomic mass
  • d) None of these

Answer: chemical properties


Question: Which of the following is the correct set of elements to Dobereiner’s triads ?

  • a)

  • b)

  • c) Data insufficient
  • d)



Question: On which of the following Dobereiner’s Triad law is not applicable?

  • a) F, Cl, Br
  • b) Cl, Br, I
  • c) Ca, Sr, B
  • d) Li, Na, K

Answer: F, Cl, Br


Question: Newlands could classify elements only upto

  • a) calcium
  • b) copper
  • c) chlorine
  • d) chromium

Answer: calcium


Question: According to Newlands theory, when elements are arranged in the order of increasing atomic weight which number element had similar properties to the first element.

  • a) eighth
  • b) third
  • c) seventh
  • d) sixth

Answer: eighth


More Questions.........................


Question: Lothar Meyer plotted the physical properties such as atomic volume, melting point and ...X... against atomic weight. Here, X refers to

  • a) boiling point
  • b) None of these
  • c) mass
  • d) surface tension

Answer: boiling point


Question: The most significant contribution towards the development of periodic table was made by

  • a) Mendeleev
  • b) Dalton
  • c) Avogadro
  • d) Cavendish

Answer: Mendeleev


Question: Noble gases were included in Mendeleev’s periodic table in the

  • a) None of these
  • b) 7th group
  • c) 1st group
  • d) 8th group

Answer: None of these


Question: Mendeleev classified elements in

  • a) seven periods and nine groups
  • b) eight periods and seven groups
  • c) eight periods and eight groups
  • d) increasing order of atomic groups

Answer: seven periods and nine groups


Question: Select the correct chronological order for the discoveries of the following scientists.

Dobereiner, Newlands, Chancourtois, Mendeleev

  • a) Dobereiner, Chancourtois, Newlands, Mendeleev
  • b) Dobereiner, Newlands, Chancourtois, Mendeleev
  • c) Chancourtois, Newlands, Dobereiner, Mendeleev
  • d) Chancourtois, Dobereiner, Newlands, Mendeleev

Answer: Dobereiner, Chancourtois, Newlands, Mendeleev


Question: Who developed long form of the periodic table?

  • a) Neils Bohr
  • b) Moseley
  • c) Lothar Meyer
  • d) Mendeleev

Answer: Neils Bohr


Question: At present, how many elements are known

  • a) 118
  • b) 112
  • c) 110
  • d) 113

Answer: 118


Question: Which of the scientists given below discovered that periodic table should be based on the atomic number ?

  • a) Moseley
  • b) Mendeleev
  • c) Newlands
  • d) Lothar Meyer

Answer: Moseley


Question: How many elements are there in 6th period of periodic table?

  • a) 32
  • b) 8
  • c) 18
  • d) 30

Answer: 32


Question: Modern periodic table is based on the atomic number of the elements. The experiment which proved the significance of the atomic number was

  • a) Mosley’s work on X-ray spectra
  • b) Bragg’s work on X-ray diffraction
  • c) Discovery of X-rays by Rontgen
  • d) Mulliken’s oil drop experiment

Answer: Mosley’s work on X-ray spectra




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