Check Here for Most Important Questions on Periodicity!

By Renuka Miglani|Updated : August 16th, 2021

Hello Gradians,

It will not be a new thing for you if we say that Gradeup is considered the synonym for success. For the past 5 years, At BYJU'S Exam Prep, we have been promoting talented candidates of the CSIR-NET category to the path of success. As a result, BYJU'S Exam Prep has been an integral part of the preparation journey of many Aspirants.

As we all know, the CSIR-NET exam is very near, and there is no time left for revision. At this point, you must be seeking some ready-made authentic short revision notes or some important questions to practice just before the exam. How will you react if you get all these study materials in one place? It will be beneficial for you at this time, right! We at BYJU'S Exam Prep comes up with Important Questions on Periodicity for Chemical Sciences to help you score good marks, which our experienced subject-matter experts have meticulously designed. So what are you waiting for? Scroll down the article below and start study for the CSIR NET Exam; these questions will be fruitful during last-minute revision to fetch more marks in the exams. Students can also download it as a PDF file and save it for future purposes.

We have been providing short study notes for the Chemical Science subject, which can be checked here. We have experienced immense love and support from all of you through these short notes in the CSIR-NET category, and we hope you all continue to support us in the same way!

Hello Gradians,

It will not be a new thing for you if we say that Gradeup is considered the synonym for success. For the past 5 years, At BYJU'S Exam Prep, we have been promoting talented candidates of the CSIR-NET category to the path of success. As a result, BYJU'S Exam Prep has been an integral part of the preparation journey of many Aspirants.

As we all know, the CSIR-NET exam is very near, and there is no time left for revision. At this point, you must be seeking some ready-made authentic short revision notes or some important questions to practice just before the exam. How will you react if you get all these study materials in one place? It will be beneficial for you at this time, right! We at BYJU'S Exam Prep comes up with Important Questions on Periodicity for Chemical Sciences to help you score good marks, which our experienced subject-matter experts have meticulously designed. So what are you waiting for? Scroll down the article below and start study for the CSIR NET Exam; these questions will be fruitful during last-minute revision to fetch more marks in the exams. Students can also download it as a PDF file and save it for future purposes.

We have been providing short study notes for the Chemical Science subject, which can be checked here. We have experienced immense love and support from all of you through these short notes in the CSIR-NET category, and we hope you all continue to support us in the same way!

Most Important Questions on Periodicity

1. What will be the distance between H and Cl atoms in HCl? If radius of hydrogen is 0.37 Å and the radius of chlorine is 1.67 Å - (According to the concept of covalent radius)

  1. 2.04 Å
  2. 1.88 Å
  3. 2.12 Å
  4. 1.0 Å

2. Which of the following statements is wrong?

  1. I.E.(1st) of C > I.E.(1st) of B
  2. I.E.(2nd) of C > I.E.(2nd) of B
  3. I.E.(1st) of Mg > I.E.(1st) of Na
  4. I.E.(2nd) of Mg > I.E.(2nd) of Ca

3. A d-shell containing four unpaired electrons can exchange

  1. 6
  2. 16
  3. 4
  4. 3

4. According to Moseley's experiment where he determined the fundamental property of an element, he found that (frequency)x is directly proportional to the number of effective nuclear charge (z) of metal. What was the value of x?

  1. ½
  2. 2
  3. ¾
  4. 1

5. The correct option respect to the Pauling electronegativity values of the elements is :

  1. P > S
  2. Te > Se
  3. Si < Al
  4. D. Ga < Ge

6. For heteronuclear diatomic molecule A-B having electronegativity difference (Xa – Xb), the bond length can be calculated as:  da–b = ra + rb - m(Xa – Xb). Then the value of 100m is:

  1. 9
  2. 7
  3. 4
  4. 11

7. Which of the following is the most reactive element?

  1. Na
  2. K
  3. Rb
  4. Cs

8. The element with atomic number 35 belongs to:

  1. s-block
  2. p-block
  3. d-block
  4. f-block

9. Which of the following pairs contains elements which are chemically dissimilar?

  1. Ba, Sr
  2. Na, K
  3. Ca, Zn
  4. Zr, Hf

10. The electron affinity of a hypothetical element ‘A’ is 3 eV per atom. How much energy in kcal is released when 10 g of ‘A’ is completely converted to A ion in a gaseous state?  (1 eV per atom = 23 kcal mol1, Molar mass of A = 30 g)

  1. 46
  2. 23
  3. 69
  4. None of the above

 Solutions

Solution 1.

 rH–Cl = rH + rCl – 0.09 (xCl – xH)
x → electronegativity
so, rHCl = 1.67 + 0.37 – 0.09 (4 – 2.2)
          = 1.88 Å

Solution 2.

Along the period, ionization energy increases, so, according to this, the first ionization energy of carbon will be greater than that of boron. But the second ionization energy of boron will be greater than carbon because when boron loses an electron, it will attain a stable noble gas configuration.

Solution 3.

Solution 4.

According to Moseley’s experiment, 

 (where ν = frequency) 

So,

Solution 5.

As we move left to Right, Electronegativity increases.
Si > Al ; S > P ; Ge > Ga.
As we move top to bottom; electronegativity decreases. 
Se > Te

Solution 6.

According to Stevenson & Schomaker, bond length can be calculated as:
da–b = ra + rb – 0.09(Xa – Xb) , where m=0.09 is fixed
All values of radius should be in angstrom
So, 100m = 9

Solution 7.

Reactivity of metals increases as we go down the group. So, in case of Na, K, Cs and Rb, they are present in the same group and Cs is the last metal, so it has the lowest ionisation energy and the highest reactivity.

Solution 8.

Write the electronic configuration based on Aufbau principle. 

1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p5

The last electron is accommodated on a p-energy shell.

Solution 9.

The chemical behaviour of elements depends upon the valence electrons present in them. The elements whose outer shell electronic configuration is similar are chemically similar. The outer shell electronic configuration is similar in elements belonging to the same group. Thus, elements which belong to the same group are chemically similar. Hence, Ca and Zn which belong to different groups and the presence of d-orbitals in Zn but not in Ca make them chemically dissimilar.

Solution 10.

The number of mole of  A is:

A = 10/30

As 1 mole of A releases the amount of energy 3*23 kcal

∴   The energy released for conversion of 10/30 mole of gaseous A into Aions = 23 kcal.

Answer Keys

  1. B
  2. B
  3. A
  4. A
  5. D
  6. A
  7. D
  8. B
  9. C
  10. B

 

Most Important Questions on Periodicity - Download PDF Now

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Posted by:

Renuka MiglaniRenuka MiglaniMember since Jan 2021
This article was curated by Renuka Miglani who is an Associate Manager at BYJU'S Exam Prep (CSIR-NET). A PostGrad with an educational background in Nutrition Science, she is an ardent reader & writer. Loves to impart knowledge to students. Being from a Nutrition Science background, she is well aware of the opportunities available and has hared the same in the above article. Stay tuned for more interesting articles from her which will be beneficial for your career.
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