Chapters

Structure of Atom , Classification of Elements and Periodicity in Properties

Time Allotted:  45 Minutes

Test Date:  21-Jun-2012

Q1. Use the following information to answer the next question Dalton’s atomic model had some shortcomings. J.J. Thomson made an improvement to Dalton’s model. Which of the following statements is true regarding Thomson’s atomic model? A : Thomson’s atomic model suggests that all matter is made up of atoms. B : Thomson’s atomic model infers the existence of an electron and a nucleus. C : Thomson’s atomic model suggests that atoms are indivisible and indestructible entities. D : Thomson’s atomic model infers that an electron moves around the nucleus in a definite orbit.

Q2. Which of the following elements has the largest size? A : Fluorine B : Neon C : Chlorine D : Argon

Q3. The three particles, electrons, protons, and neutrons are called A : elementary particles B : indivisible particles C : charged particles D : atomic particles

Q4. Which of the following classes of elements has the maximum tendency to accept electrons? A : Alkali earth metals B : Transition metals C : Halogens D : Inert gases

Q5. Thallium is a highly toxic p block element. Thallium sulfate is used as a rodent killer, while thallium oxide is used for producing high refractive index glasses. Its electronic configuration is [m] 4f145d106s26p1. In the electronic configuration of thallium, m denotes which noble gas? A : Radon B : Argon C : Xenon D : Krypton

Q6. Which of the following alkaline earth metals has the largest atomic radius? A : Beryllium B : Magnesium C : Calcium D : Strontium

Q7. What is the value of Planck’s constant? A : 6.99 × 10−39 Js B : 6.86× 10−36 Js C : 6.63× 10−34 Js D : 6.14 × 10−33 Js

Q8. Which of the following elements has the highest electron affinity? A : Fluorine B : Chlorine C : Bromine D : Iodine

Q9. The energy of an electron in the first Bohr orbit of a hydrogen atom is −13.6 eV. What is the energy of electrons in the excited state in the second Bohr orbit of hydrogen atom? A : −6.8 eV B : −3.4 eV C : +3.4 eV D : +6.8 eV

Q10. Which of the following elements has the highest electron affinity? A : Carbon B : Nitrogen C : Oxygen D : Fluorine

Q11. What is the radius of the second orbit of He+ ion? A : 0.265 Å B : 0.529 Å C : 1.058 Å D : 2.116 Å

Q12. On moving from left to right in a period, the atomic radii A : increases regularly B : decreases regularly C : first decreases and then increases D : first increases and then decreases

Q13. Which of the following orbital diagrams violates both Pauli Exclusion Principle and Hund’s rule of Maximum Multiplicity? A : 2s2, 2px2,2py1 B : 2s2, 2px2,2py2 C : 2s1, 2px1,2py1,2pz1 D : 2s2, 2px1,2py1,2pz1

Q14. In the long form of periodic table, the elements having similar properties A : recur after a fixed number of elements B : recur after every eight elements C : form horizontal rows D : form vertical groups

Q15. How many unpaired electrons are there in the ground state electric configuration of selenium? A : 4 B : 3 C : 2 D : 0