File No.24/04/17/12/2014
VI CLASS - IIT/N.T.S.E FOUNDATION - OLYMPIAD
ANDHRA PRADESH - TELANGANA
2014-2015 PROGRAM M E
CHEMISTRY- 3RDCHAPTER - SOLUTION
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PERIODIC CLASSIFICATION
1.
Mendeleef corrected the atomic weight of Nitrogen.
2.
The law of triads was proposed by dobereiner.
3.
The law of triads is applicable to chlorine, bromine, iodine.
4.
Name the scientist, who noticed that the eighth element was similar properties of the first element is Newland.
5.
Newland’s arranged in elements increasing order of atomic mass.
6.
Law of octaves was proposed by J.A.R Newland.
7.
The most significant contribution towards the development of periodic table was made by Mendeleev .
8.
The horizontal rows and vertical columns of a periodic table are called Periods and groups respectively.
9.
Mendeleev’s periodic table is based on atomic weight.
10.
The law of octaves was proposed by J.A.R. Newlands is based on: atomic weight.
11.
Mendeleev’s periodic classification of elements of indium, gold, platinum.
12.
Early attempts at classifications is done based on atomic weight.
13.
2014
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Dobereiner classified elements into groups
of three.
14.
Newland classified elements into groups of eight
15.
Mendeleev classified elements based on atomic weights, similarity in physical properties and similarity in
chemical properties.
16.
The basis of periodic law presented by Mendeleev was atomic mass
17.
Anamalous pair in Mendeleefs table is Be, B.
18.
In mendeleev's periodic table 8 groups.
19.
Elements in the same vertical group of the periodic table have generally the same valency electronic
configuration
20.
Eka silicon is now called as Indium.
1.
Fluorine chlorine, bromine and iodine are called halogens.
2.
In Mendeleev's periodic table the defeat is the position of isotopes
3.
The tenth element in the periodic table resembles the element with atomic number 2 as well as 54.
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CHEMISTRY - CHAPTER SOLUTIONS -3
File No.24/04/17/12/2014
VI CLASS - IIT/N.T.S.E FOUNDATION - OLYMPIAD
4.
Elements New lands classification of elements the law of octaves was the first logical attempt to classify
elements on the basis of atomic weights, periodicity of elements was recognised for the first time.
5.
Select the following pair of elements in which their arithmetic mean of atomic weights is equal to the atomic
weight of strontium Calcium, Barium
6.
According to Mendeleev’s periodic classification of elements eka-boron was named as scandium, ekaaluminium was named as gallium and eka-silicon was named as germanium .
7.
According to law of triads, relation between all properties of an element.
8.
(i) Elements with both metallic and non-metallic characters are called metalloids .
(ii) Arrangement of elements into groups of three is called triads.
9.
In dobereiner classification the number of elements in each set is 3.
10.
In Newland’s law of octavaes the eighth element after lithium is sodium.
11.
In Newland’s law of octaves the eighth element after flourine is chlorine.
12.
The systemic relationship between the order of atomic masses and the repetition of properties of elements
is called periodicity.
13.
The number of elements known at that time when Mendeleev arranged that in the periodic table was 63.
14.
Tellurium, iodine pair is against to against to Mendeleev’s periodic laws.
15.
Mendaleev’s periodic table in Ib, VII b.
16.
The number of elements in period 1 of the periodic table is 2.
17.
According to Mendeleev’s periodic table transition elements are placed in VIII group.
18.
Mendeleev periodic table were for: Gallium and Germanium
19.
According to Newland classification this law could be best applied, only up to the element calcium, newly
discovered elements could not fit into the octave structure.
20.
Mendeleev’s periodic table defects : the position of hydrogen is not correctly defined, in certain pairs of
elements like Ar (40) and K (39), Co (58.9) and Ni (58.6); Te (127.6) and I (126.9) and arrangement was
not justified and Mendeleev’s table was unable to explain the cause of periodicity among elements.
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BRAIN
TWISTERS
2014
- 2015
1.
The atomic number, atomic weights and atomic mass where the basis of the classification proposed by
Dobereiner.
2.
Law of octaves could be best applied only upto the element calcium, newly discovered elements could not fit
into the octave structure, periodicity of element was recognised for the first time by Newland and law of
octaves was based on atomic weights.
3.
According to Newland’s, similar properties lithium, Sodium and Potassium, Chlorine, Flourine.
4.
Mendeleev’s periodic classification similarities in the chemical properties of the elements, increasing order of
atomic weights of the elements.
5.
Mendeleev’s periodic table could not predict the following: isobars, isotopes and isotones.
6.
a) The eighth element after Flourine is
-
Sulphur
b) The eighth element after Oxygen is
-
Aluminium
c) The eighth element after Boron is
-
Phosphorus
d) The eighth element after Nitrogen is
-
Calcium
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CHEMISTRY - CHAPTER SOLUTIONS -3
File No.24/04/17/12/2014
7.
8.
VI CLASS - IIT/N.T.S.E FOUNDATION - OLYMPIAD
a) Lavoisier classified
Metals and non-metals
b) Dobernier classified
Triads Ca, Sr & Ba
c) Dalton classified
81.25
d) Mean atomic mass of
Table of the relative weights of the ultimate
particles of gaseous and other bodies
a) Hydrogen
1st period
b) Lithium
9.
10.
11.
2nd period
c) Sodium
3rd period
d) Potassium
4th period
a) Lithium
7
b) Beryllium
9
c) Boron
11
d) Carbon
12
a) Law of octaves
Newlands
b) Triads of elements
Dobereiner
c) Periodic table
Mendeleev
d) Modern periodic law
Moseley
In Mendeleev’s periodic table, the elements were arranged in vertical columns, called groups.
Assertion is correct, but Reason is in correct.
12.
Newland arranged many of known elements in the increasing order of their atomic weights.
Newland laws of octave doesn’t applicable for heavier elements.
Both Assertion and Reason are correct and Reason does not explains Assertion.
13.
Classification of elements is not useful to
reveal-the
relationship between the different elements.
2014
2015
Classification of elements may lead to correlate the properties of the elements with some fundamental
property that is characteristic of all the elements.
Assertion is wrong and Reason is correct.
14.
Nitrogen and Phosphorous belongs to same group and exhibits similar properties, similarly. Carbon and
Silicon belongs to same group and exhibits same property.
Given Reason is incorrect and Reason is correct.
15.
Atomic weight of eka-boron is 44 and atomic weight of scandium is 43.79
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Both statements are correct and Reason doesnot explain Assertion.
16.
The elements which are malleable, ductile and good conductors of heat and electricity are named as
metals.
17.
The elements which are brittle, bad conductors of heat and electricity are named as Non-metals.
18.
The elements posses both metallic and non metallic characteristics are named as Metalloids.
19.
Arithmetic mean of atomic weights of Li, Na and K is 23.0
20.
The atomic mass of chlorine is 35.5
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CHEMISTRY - CHAPTER SOLUTIONS -3
File No.24/04/17/12/2014
VI CLASS - IIT/N.T.S.E FOUNDATION - OLYMPIAD
1.
G, O, D are the correct symbols of right elements of the periodic table arranged in the increasing order of
their atomic weights. The atomic weight of ‘G’ is 40 and that of D is 137. If G, O, D are the elements of a
Dobereiner triad, then find the atomic weight of ‘O’, 88.5.
2.
Quite large number of elements cannot be grouped into triads. It was possible to group quite dissimilar
elements into triads.
Both Assertion and Reason are correct, and Reason is not correct reason of Assertion.
3.
According to Dobereiner’s law of triads chemically similar elements arranged in the order of their atomic
weights in the groups of three elements.
4.
The discovery of which of the following group of elements gave a death below to the Newland’s law of
octaves: inert gases
5.
The elements Copper and Nickel, Platinum and Gold are over looked by Mendeleef.
6.
Mendeleev’s periodic table it has helped in correcting the doubtful atomic weights.
7.
Mendeleeff’s periodic table Mendeleef corrected the atomic weight of some elements like Be, In etc
8.
The atomic number of element Unq is : 104
9.
Neutron/proton ratio reflect the periodicity of the elements.
10.
Mono atomic element among the following is Krypton.
11.
The element with atomic number 19 is an alkali metal.
12.
Atomic number of next inert gas to be discovered will be 118
13.
The group in which all the elements are gases is 0 group
14.
About two thirds of the elements in the periodic table are metals
15.
Maximum work in periodic table related with atomic number was done by mosley
16.
Periodicity in the properties of elements means that whenelements are arranged in the increasing order of
their atomic weights or atomic numbers, elements with similar nature repeat after certain regular interval
17.
Elements in the same vertical group of the periodic table have generally the same number of electrons in
the outer most shell of their atoms.
18.
The cause of periodicity of properties is the reoccurrence of similar outer electronic configuration
19.
Tenth element in the periodic table resembles the second.
20.
The fundamental basis of the present day periodic table is that the elements are arranged in the increasing
order of number of protons in the nuclei.
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2014 - 2015
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CHEMISTRY - CHAPTER SOLUTIONS -3