Question 4 :
How did Mendeleev predict the existence of some yet to be discovered elements in his periodic table?<br/>
Question 5 :
Reducing nature in ................. increases with increase in atomic number in alkali metals.<br/>
Question 6 :
In Newland's classification, elements are arranged in an increasing order of their:
Question 11 :
The law used by Newlands to arrange elements is known as Newlands Law of Octave .<br/>
Question 14 :
The attempt for classifying elements by plotting the atomic masses of elements against the atomic volumes was made by:
Question 15 :
If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is :<br/>
Question 16 :
Which of the following triads does not follow Dobereiner's law of triads?
Question 17 :
Which of the following statement about Mendeleev's periodic table is incorrect?
Question 18 :
In Mendeleev's periodic table few elements that are chemically similar are placed in the same groups.<br/>
Question 19 :
Which of the following is the correct set of elements to Dobereiner's triads ?
Question 20 :
Numbering of groups as 1, 2, ........... 18 was adopted by IUPAC in :
Question 23 :
Mendeleev arranged the elements in increasing order of their atomic masses and according to their physical properties.<br/>
Question 25 :
The element placed with cerium, in the table formed by Newlands' was :
Question 26 :
The most significant contribution towards the development of periodic table was made by:<br/>
Question 27 :
The name given by Newlands to the arrangement created by him was :
Question 29 :
The placement of elements in the Newlands' table was compared to :
Question 31 :
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 32 :
Which periods were not divided into two series in the Mendeleev's periodic table?
Question 34 :
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of  58.69 amu. Reason for the same is that :
Question 35 :
The first attempt to classify elements systemically was made by :
Question 36 :
If X and Y are two elements which belong to same group of Newland's periodic table, how many elements exists between X and Y?
Question 37 :
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 38 :
In Doberenier triads, the atomic weights of the elements in a triad are in increasing order.<br/>
Question 39 :
Which among the following is not an anomalous pair in Mendeleev's periodic table?
Question 41 :
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 42 :
In Newlands' table, which of the following elements was not placed in the same group in which cobalt and nickel were present?
Question 43 :
The groups from $1^{st}$ to $7^{th}$ of Mendeleev's periodic table were divided into ______ subgroups.
Question 44 :
Mendeleev used a Sanskrit numeral before the names of the predicted elements. What was the term used for it?
Question 48 :
The sum of the number of elements of fifth and sixth period is :
Question 50 :
Isotopes could find a position in Mendeleev's periodic table.<br/>State whether the given statement is true or false.<br/>
Question 51 :
The periodic table of today owes its development to two chemists namely:
Question 52 :
Which is not anomalous pair of elements in the Mendeleev's periodic table?
Question 53 :
Identify the correct sets of entries that are rightly matched.<br/>         Column A                                    Column B<br/>(A) Bridge elements                (a) Elements of group IA-VIIA(B) Representative elements   (b) 2nd-period elements(C) Typical elements               (c) 7th-period elements(D) Transition elements          (d) 3rd-period elements(E) Transuranic elements        (e) Present in 4th, 5th and 6th periods
Question 56 :
Which of the following sets of elements follows Newland's octave rule?<br/>
Question 57 :
It was assumed by newlands that only 63 elements existed in nature and no more elements would be discovered in the future.
Question 61 :
If periodic table would have contained 10 period, maximum elements in that periodic table would be:
Question 62 :
In a triad of $A, B, C$ elements if the atomic masses of $A$ and $C$ respectively are $100$ and $200$, then the atomic mass of $B$ is:
Question 65 :
The attempt for classifying elements by plotting the atomic masses of elements against the volumes was made by:
Question 66 :
If ($N, P, As$) was Dobereiner's triads then what would be the absolute error in atomic mass of phosphorous as compared to the original mass?<br/>Atomic mass : Nitrogen $=14$ amu, Arsenic $=74.9$ amu, Phosphorous $=31$ amu<br/>
Question 68 :
In Doberenier triads, the atomic weights of the elements in a triad are in increasing order.<br/>State whether the given statement is true or false.
Question 71 :
Three elements X, Y and Z form a Dobereiner triad. The ratio of the atomic weight of X to that of Z is 7: 25.<br/> If the sum of the atomic weights of X and Z is 160, find the atomic weights of X, Y and Z.
Question 72 :
Assertion: According to Mendeleev's periodic law; The properties of elements are the periodic a function of their atomic numbers.
Reason: Mendeleev's periodic law could explain the phenomenon of anomalous pairs.
Question 75 :
Assertion: Newland's law of octaves of elements is a function of their state that the property of every eighth element is the repetition of the first.
Reason: In order to fit new elements into his table Newland adjusted two elements in the same column.<br/>
Question 79 :
The given arranged sequence on the basis of their increasing atomic masses represents which law of classification of elements?  <br/>$F, Na, Mg, Al, Si, P, S, Cl$ & $K$
Question 80 :
Which of the following can be found in the second period?
Question 81 :
Assertion: According to Mendeleev, periodic properties of elements are periodic function of their atomic number.
Reason: Atomic number is equal to the number of protons.
Question 82 :
Which of the following set of elements cannot be a triad?
Question 83 :
For which of the pair Newland octave rule is not applicable?
Question 84 :
Chlorine, Y and Iodine form a Dobereiner's triad. Identify the atomic weight of Y.
Question 85 :
Which of the following statements is not true about Dobereiner's law of triads?
Question 86 :
The elements which have taken the place of Eka aluminium is :<br/>
Question 87 :
Assertion: According to Dobernier's, a group of three similar elements arranged in their increasing atomic weights so that atomic weight of middle is equal to the arithmetic mean of the other two elements.
Reason: Atomic weight is equal to one twelfth of mass of a carbon atom.
Question 88 :
The elements $A$ and $B$ obey Newland's law of octave. How many elements are there between $A$ and $B$?
Question 89 :
Fill in the blanks <br/>The elements present in horizontal rows of a periodic table have same valence shell.
Question 93 :
Which of the following is(are) Dobereiner's triads?<br/>(a) P, As, Sb (b) Cu, Ag, Au(c) Fe, Co, Ni(d) S, Se, Te<br/>
Question 94 :
In Lother Meyer's curve most electronegative elements or halogens occupied ___________________.
Question 95 :
Which of the following was one of the limitations of Mendeleev's periodic table?<br/>
Question 96 :
$A,\ B,\ C$ are three elements with the atomic number $Z-1, Z, Z+1$ respectively. $B$ is an inert gas. Predict the group of $A$ and $C$.
Question 97 :
Which of the following is not a merit of Mendeleev's periodic table?
Question 98 :
John Newlands arranged the known elements in a/an  ______ order of their atomic _______ .<br/>
Question 99 :
Classification of periodic table based on atomic number is given by:<br/>
Question 100 :
Which of the following are the demerits of Mendeleev periodic table?<br/>
Question 101 :
According to Lothar Meyer's curve, which of the following statement is/are correct?
Question 103 :
Most transition metals from multiple cations, that is, they have more than one possible amount of positive charge. Virtually all of the transition metals form dipositive $(2+)$ cations, along with one or more other forms. For example, titanium forms $Ti^{2+}$ ad $Ti^{4+}$, and cobalt forms $Co^{2+}$ and $Co^{3+}$.<br>The principal exceptions to this predominance of cations with a $2^{+}$ charge are scandium and yttrium, which form only tripositive cations. $Sc^{3+}$ and $Y^{3+}$, and copper and silver, which form cations with a single positive charge. $Cu^{+}$ and $Ag^{+}$.<br>[While copper also forms dipositive $Cu^{2+}$, silver exhibits the single positive state essentially exclusively.]<br>Which of the following offers a POSSIBLE explanation for the existence of $Cu^{+}$ and $Ag^{+}$?
Question 107 :
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.
