Question Text
Question 1 :
Which of the following is the correct set of elements to Dobereiner's triads ?
Question 4 :
Mendeleev arranged the elements in increasing order of their atomic masses and according to their physical properties.<br/>
Question 6 :
The eight group of Mendeleev's periodic table is divided into how many subgroups?
Question 7 :
Which periods were not divided into two series in the Mendeleev's periodic table?
Question 8 :
The elements having more masses were placed before elements having lower masses in Mendleev's periodic table. Guess the pair of elements (higher mass, lower mass).
Question 9 :
Who was the first to classify the elements into metals and non-metals?
Question 10 :
Which of the following was one of the limitations of Mendeleev's periodic table?<br/>
Question 13 :
Which of the following is(are) the merit(s) of Mendeleev's periodic table?<br/>
Question 14 :
The elements which have taken the place of Eka aluminium is :<br/>
Question 15 :
For which of the pair Newland octave rule is not applicable?
Question 18 :
Assertion: According to Mendeleev, the properties of elements are a periodic function of their atomic weights.
Reason: Mendeleev left the gap under aluminium and a gap under silicon, and called these elements Eka-Aluminium and Eka-Silicon.
Question 20 :
According to Lothar Meyer's curve, which of the following statement is/are correct?