In this article, students who are looking for the important concepts, formulae and difficulty level of the questions asked in previous examination, will get chapter notes of chapter Periodic Classification & Periodicity in Properties which will help them in their preparation for UPSEE entrance examination 2018.
These notes contain all important topics related to Periodic Classification & Periodicity in Properties like need to classify elements, Law of Triads, Law of Octaves, Mendeleev's Periodic Table, Modern Periodic Table, Characteristics of Modern Periodic table, Periodic Trends in Properties of Elements etc.
These notes will help UPSEE aspirant to get to familiar with the difficulty level of the questions which can be asked in the coming examination.
These notes are prepared by experienced Subject Experts of Chemistry after the detailed analysis of the latest syllabus and pattern of UPSEE examination.
About the exam:
Uttar Pradesh State Entrance Examination (UPSEE) is a state level engineering entrance examination for degree level engineering institutions and other professional colleges. It is regulated by Dr. A.P.J. Abdul Kalam Technical University (AKTU) formerly known as Uttar Pradesh Technical University (UPTU).
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Important Concepts:
UPSEE: Important Questions and Preparation Tips – Electrochemistry
Some previous year solved questions are given below:
Question 1:
Ionisation energy in group 1A varies in the decreasing order as
(a) Li > Na > K > Cs
(b) Na > Li > K >Cs
(c) Li > Cs > K > Na
(d) K > Cs > Na > Li
Solution 1:
In a group atomic size increases as we move from top to bottom. So, the amount of energy
required for ejection of an electron from atom decreases i.e. ionisation energy decreases.
So, the decreasing order of ionisation energy in group 1A is as follows:
Li > Na > K > Cs
Hence, the correct option is (a).
UPSEE: Important Questions and Preparation Tips – States of Matter
Question 2:
The incorrect statements among the following is
(a) the first ionisation potential of Al is less than the first ionisation potential of Mg
(b) the second ionisation potential of Mg is lower than the second ionisation potential of Na
(c) the first ionisation potential of Na is less than the first ionisation potential of Mg
(d) the third ionisation potential of Mg is greater than the third ionisation potential of Al
Solution 2:
IE2 of Mg is lower that of Na because in case of Mg2+, 3s electron has to be removed while in case of Na+ an electron from the stable inert gas configuration (neon) has to be removed.
Hence, the correct option is (b).
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Question 3:
Which one of the following arrangements represents the correct order of electron gain enthalpy
(with negative sign) of the given atomic species?
(a) CI < F < S < CO
(b) CO < S < F < CI
(C) S < CO < CI < F
(d) F < CI < CO < S
Solution 3:
Election Gain enthalpy: It is the energy released when one mole of electrons are added to gaseous atoms of an element. Generally electron gain enthalpy increases in a period from left to right but decreases in a group on moving down.
Fluorine due to its smaller size has unexpectedly low electron gain enthalpy than Cl.
Similar is shown in case of CO and S. Thus, the order of electron gain enthalpy is
CO < S < F < CI
Hence, the correct option is (b).
UPSEE: Important Questions and Preparation Tips – Solutions
Question 4:
Which pair of elements has same chemical properties?
(a) 13, 22
(b) 3, 11
(C) 4, 24
(d) 2, 4
Solution 4:
Hence, the correct option is (b).
UPSEE: Important Questions and Preparation Tips – Atomic Structure
Question 5:
Solution 5:
Hence, the correct option is (b).
