Question 1 : Statement: In Dobernier classification of elements, the atomic weight of the middle element is equal to the average of the extreme elements of a triad.<br/><div><br/></div><div>State whether the given statement is true or false.</div>
Question 2 :
In Mendeleev's periodic table few elements that are chemically similar are placed in the same groups.<br/>
Question 4 :
In Newlands' table, which of the following elements was not placed in the same group in which cobalt and nickel were present?
Question 8 :
The first attempt to classify elements systemically was made by :
Question 9 :
The name given by Newlands to the arrangement created by him was :
Question 10 :
Cl, Br, I follows Dobereiner's triads, the atomic masses of Cl and I are 35.5 and 127 respectively. The atomic mass of Br is : <br/>
Question 11 :
Which of the following sets of atomic masses do not correspond to Dobereiner's triad?<br/>
Question 13 :
<span>The correct electronic configuration of element having mass number 24 and number of neutrons 12 is</span>
Question 15 :
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. Such an arrangement of elements called as :<br/>
Question 16 :
Which scientist came up with the concept of a periodic table that included all of the known elements?<br>
Question 20 :
Which among the following is not an anomalous pair in Mendeleev's periodic table?
Question 21 :
Numbering of groups as 1, 2, ........... 18 was adopted by IUPAC in :
Question 23 :
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 24 :
If the two members of a Dobereiner's triad are chlorine and iodine, then the third member of this triad is :<br/>
Question 26 :
Which periods were not divided into two series in the Mendeleev's periodic table?
Question 27 :
Assertion: The Newland's law of octaves fail.
Reason: The properties of elements beyond atomic weight 40 cannot be explained.
Question 28 :
Which of the following is the correct set of elements to Dobereiner's triads ?
Question 29 :
The properties of the elements, as well as the formulae and properties of their compounds depend in a periodic manner on the atomic weights of the elements. This periodic law was given by :<br/>
Question 30 :
Whose name is associated with the development of periodic table ?
Question 31 :
Eka-Boron was the name given by Mendeleev to the element similar to _______ in properties.
Question 32 :
The element placed with cerium, in the table formed by Newlands' was :
Question 36 :
Which of the following statement about Mendeleev's periodic table is incorrect?
Question 38 :
The placement of elements in the Newlands' table was compared to :
Question 39 :
Two elements were elected by Mendeleev for studying the properties of compounds formed by other elements with the selected elements. What were the selected elements?
Question 40 :
Which of the following triads does not follow Dobereiner's law of triads?
Question 41 :
The groups from $1^{st}$ to $7^{th}$ of Mendeleev's periodic table were divided into ______ subgroups.
Question 42 :
Assertion: The placement of isotopes in Mendeleev's periodic table overcome in the modern periodic table.
Reason: In modern periodic table, the elements have been allotted places based on their atomic numbers
Question 43 :
How did Mendeleev predict the existence of some yet to be discovered elements in his periodic table?<br/>
Question 45 :
According to Mendeleev's periodic law, the properties of elements are a periodic function of:<br/>
Question 47 :
In Newland's classification, elements are arranged in an increasing order of their:
Question 48 :
The law used by Newlands to arrange elements is known as <span>Newlands Law of Octave</span> .<br/>
Question 49 :
Eka-silicon was the name given by Mendeleev to the element similar to ________ in properties.
Question 50 :
If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is :<br/>
