History Of Periodic Table
6 Questions
| Total Attempts: 45
.
Questions and Answers
- 1.Dobereiner's triad was based on
- A.
Atomic mass
- B.
Atomic number
- C.
Ions
- D.
Valency
- 2.Who proposed the law of octaves?
- A.
Mendeleev
- B.
Newland
- C.
Mosely
- D.
Dobereiner
- 3.Position of isotope was a problem in
- A.
Mendeleev's
- B.
Newland's
- C.
Dobereiner's
- 4.Merit of mendeleev' periodic table
- A.
Based on atomic mass
- B.
Position of isotopes
- C.
Left gaps for discovery of elements
- D.
Position of hydrogen
- 5.The atomic mass of sodium if lithium - mass 7, sodium and potassium mass 39 are triads is
- A.
23
- B.
30
- C.
26
- D.
21
- 6.Demerit of Newland's classification is
- A.
Only lighter elements could be arranged
- B.
Only heavier elements could be arranged
- C.
Position of isotopes
- D.
Position of hydrogen
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