Periodic table Quiz-05

Periodic table Quiz-05

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NEET is the most famous and important medical entrance examination held in our country. This exam is an objective type, an offline test which includes 4 sections namely– Physics, Chemistry, Botany, and Zoology. The maximum marks that can be scored are 720 marks and have 180 questions. About half of the paper consists of questions from Biology, as the NEET exam essentially focuses on capacitating students to go for seats in medical courses. One of the most significant and crucial sections in the NEET exam is of Biology. It comprises of theories, descriptions, discoveries, diagrams, definitions, explanations of differences, and relations. The majority of the topics covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12 and other related sources become part of the rest of the syllabus. Clear Exam curates a list of articles selected by professionals who recommend the highly vital topics for NEET exams. The table below takes you directly to the respective topic where the in-depth article and the MCQs are available for an easy and productive learning experience. Prior to solving NEET question papers or practicing mock tests, you must ensure to study the basic concepts in NEET and practice a few sample questions related to this exam. Students will be covered for all their studies as the topics are available from basics to even the most advanced. .

Q1.   In which element shielding effect is not possible?

•  H
•  Be
•  B
•  N

Solution
(a) H atom has 1s^1 configuration. Shielding effect is property of penultimate shell electrons.

Q2.   Which has the highest ionisation potential?

•  Na
•  Mg
•  C
•  F

Solution
(d) Ionisation potential increases along the period.

Q3.   Which has an odd electron and shows paramagnetic character?

•  NO
•  SO_2
•  CO_2
•  H_2 O

Solution
(a) NO has 15 electrons.

Q4.   Which of the following is a false statement?

•  Fluorine is more electronegative than chlorine
•  Nitrogen has greater IE_1than oxygen
•  Lithium is amphoteric
•  Chlorine is an oxidising agent

Solution
(c) Lithium is basic in nature and hence, it is not amphoteric.

Q5.   The correct order of increasing electron affinity of halogens is

•   F
•  I
  
•  I>Br>Cl>F
•  Br>I>F>Cl

Solution
(b) The value of electron affinity decreases with increase in size of atom, because the nuclear attraction decreases as the atomic number increases. Fluorine due to its very small size has lower electron affinity than chlorine. Hence, the increasing order of electron affinity of halogen is I (less than) Br (less than) F (less than) Cl.

Q6.   The first four ionisation energy values of an element are 191, 578, 872 and 5962 kcal. The number of valence electrons in the element is

•  1
•  2
•  3
•  4

Solution
(c) Since, the IV^th IE is very high, ie, electron is to be removed from stable configuration, thus it has 3 valence electrons

Q7.   The correct order according to size is

•  O>O^->O^(2-)
•  O^->O^(2-)>O
•  O^(2-)>O^->O
•  O>O^(2-)>O^-

Solution
(c) The correct order according to size is as O^(2-)>O^->O

Q8.   The maximum valency of an element with atomic number 7 is

•  2
•  3
•  4
•  5

Solution
(d) Valency is according to valence shell configuration which here is 1s^2,2s^2,2p^3,ie,5

Q9.   Which of the following is most stable?

•  Pb^(2+)
•  Ge^(2+)
•  Si^(2+)
•  Sn^(2+)

Solution
(a) The tendency to show lower ionic state increases down the group due to inert pair effect.

Q10.   Which of the following elements never show positive oxidation number?

•  O
•  Fe
•  Ga
•  F

Solution
(d) Fluorine is the most electronegative element in the Periodic Table so it never shows positive oxidation state.