Pick out the chemically most reactive elements from the given triads.Li, Na, K F, Cl, Br
Li and F
Li and Br
K and F
K and Br
Q.2.
Which of the following set of elements are arranged in increasing order of metallic character?
Be Mg Si
Li Na K
Cl Br I
K Na Rb
Q.3.
Which set of elements in the periodic table are called metalloids?
Boron, silicon, germanium, arsenic
Antimony, tellurium, polonium
Aluminium, gallium, indium
Both (a) and (b)
Q.4.
Non metals are situated on the _____________ side of the periodic table.
left
right
centre
Q.5.
Newlands relation is called
Musical Law
Law of Octaves
Periodic Law
Atomic Mass Law
Q.6.
In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic Table later?
Chlorine
Silicon
Oxygen
Germanium
Q.7.
A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?
MO
M2O
M2O3
MO2
Q.8.
The properties of eka-aluminium predicted by Mendeleev are the same as the properties of later discovered element
Scandium
Germanium
Gallium
Aluminium
Q.9.
Pick out the chemically most reactive elements from the given set of elementsLi, Na, K F, Cl, Br
Li and F
Li and Br
Na and Cl
K and F
Q.10.
At the time of Mendeleev, the number of elements known was
62
61
63
56
Q.11.
Which of the following belong to same period?Element A B C D EAtomic No 6
DEA
BCD
ABC
ADE
Q.12.
Which one of the following statements is not correct about the trends in the properties of the elements of a period on going from left to right?
oxides become more acidic
the atom gains electrons readily
the element becomes more metallic
there is increase in no of valence electrons
Q.13.
An element X has mass numberand containsneutrons in its atom. To which group of the Periodic Table does it belong?
Group 1
Group 3
Group 2
Group 4
Q.14.
Electronegative character ________ down the group
increases
decreases
no change
Q.15.
Which one of the following does not increase while moving down the group of the periodic table?
Atomic radius
Metallic character
Valency
Number of shells in an element.
Q.16.
Choose the correct statement from the following:
Mendeleev considered oxides and halides made by elements as criteria for classification
Newland's law of octaves was valid upto the element vanadium
Doberieneer could identify only 5 triads
modern periodic table removed the anomaly of position of isotopes
Q.17.
According to Modern periodic law, the properties of elements are the periodic functions of 'X' ; Identify 'X'.
Atomic no of elements
Atomic mass of elements
Atomic volumes of elements
Atomic densities of elements
Q.18.
Halogens belong to __________ group of periodic table
12
13
17
18
Q.19.
Select the correct arrangement of following elements in doberieners triads Sr, K, Ca, Br, Na, Ba, Cl, I, Li
i) Li Sr K ii) Ca Na Ba iii) Cl Br I
i) Li Na K ii) Ca Sr I iii) Cl Br Ba
i) Li Na K ii) Ca Sr Ba iii) Cl Br I
i) Ca Na K ii) Li Sr Ba iii) Cl Br I
Q.20.
EKABORON , EKA ALUMINIUM AND EKA SILICON REPRESENT WHICH OF THE FOLLOWING SETS OF ELEMENTS?
SCANDIUM,GALLIUM,GERMANIUM
GERMANIUM, SCANDIUM,GALLIUM,
GALLIUM,SCANDIUM ,GERMANIUM
GALLIUM,GERMANIUM, SCANDIUM
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