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)
Answer:
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