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Worksheetsclassification of elements
Total questions: 12
Worksheet time: 6mins
Pick out the chemically most reactive elements from the given triads.Li, Na, K F, Cl, Br
(a) Li and F
(b) Li and Br
(c) K and F
(d) K and Br
Newlands relation is called
a) Musical Law
(b) Law of Octaves
(c) Periodic Law
(d) Atomic Mass Law
Pick out the chemically most reactive elements from the given triads.
(a) Li and F
(b) Li and Br
(c) K and F
(d) K and Br
Up to which element,law of octaves found to be applicable
Oxygen
Calcium
Cobalt
Potassium
Which one of the following elements do not constitute a Doebereiner's triad ?
Cl,Br, I
Li,Na,K
S,Se,Te
N,P,As
The most significant contribution towards the development of periodic table was made by
Mendeleev.
Avogadro.
Dalton.
Cavendish.
The number of elements known at present is ___.
31
114
63
75
Law of Triads was referred to as ___ relationship.
Lothar Meyer's
Mendeleev's
Newlands's
Dobereiner's
In which order do we need to put barium, calcium, and strontium for Dobereiner's Law of Triads to apply?
calcium, strontium, barium
barium strontium calcium
strontium barium calcium
stontium calcium barium
how many triads are invented by dobereiner among the the elements of his time
5
3
2
4
A and B are two elements having similar properties which obey the law of octaves. how many elements are there in between A and B?
8
7
6
3
Given that XYZ are triads. Atomic masses of X and Z are32, 125 respectively. then what is the atomic mass of Y is ?
157
93
78.5
77,5
