## Periodic table Quiz-09

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 of the following arrangements the order is not correct according to property indicated against it?
•  Increasing size :Al^(3+)
•  Increasing IE_1 ∶B
•  Increasing EA_1 ∶I
Solution
(b) IE_1 of N>IE_1 of O due to half filled nature in N.

Q2.   Consider the ions K^+,S^(2-),Cl^- and Ca^(2+). The radii of these ionic species follow the order
•  Ca^(2+)>K^+>Cl^->S^(2-)
•  Cl^->S^(2-)>K^+>Ca^(2+)
•  Ca^(2+)>Cl^->K>S^(2-)
•  S^(2-)>Cl^->K^+>Ca^(2+)
Solution
(d) The correct order of ionic radii of these ions is 〖 S〗^(2-)>Cl^->K^+>Ca^(2+).

Q3.   H-B-H bond angle in BH_4^- is:
•  180°
•  120°
•  109°
•  90°
Solution
(c) Due to sp^3-hybridization.

Q4.   Identify the transition element.
•  1s^2,2s^2 2p^6,3s^2 3p^6,4s^2
•  1s^2,2s^2 2p^6,3s^2 3p^6 3d^2,4s^2
•  1s^2,2s^2 2p^6,3s^2 3p^6 3d^10,4s^2 4p^2
•  1s^2,2s^2 2p^6,3s^2 3p^6 3d^10,4s^2 4p^1
Solution
(b) Transition elements are those elements which have partially filled d-subshells in their elementary form. Therefore, the general electronic configuration of d-block element is (n-1) d^(1-10) ns^(1-2).

Q5.   A→A^++e,E_1 and A^+→A^(2+)+e,E_2. The energy required to pull out the two electrons are E_1 and E_2 respectively. The correct relationship between two energy would be
•  E_1
•  E_1>E_2
•  E_1=E_2
•  E_1≠E_2
Solution
(a) E_1

Q6.   Arrange the following compound in order of increasing dipole moment: Toluene (I) m-dichlorobenzene (II) o-dichlorobenzene (III) p-dichlorobenzene (IV)
•  I
•  IV
•  IV
•  IV
Solution
(b) o-,m-,p-derivatives has α=60°,120° and 180° and thus, resultant vector has zero dipole moment in p-derivative. Also dipole moment of m-dichlorobenzene is more than toluene.

Q7.   Maximum number of covalent bonds between two like atoms can be:
•  Three
•  Two
•  Four
•  One
Solution
(a) Two like atoms involved in bonding can form only two π-and one σ-bond within themselves because π-bonds are formed by p-orbitals and only when σ-has already formed. Remember only three p-orbitals exist.

Q8.   Which is not true in case of ionic bond?
•  It is linear bond
•  It is 100% ionic
•  It is formed between two atoms with large electronegativity difference
•  None of the above
Solution
(a) Ionic bond are non-directional.

Q9.   Which is chemically most active non-metal?
•   S
•  O_2
•  F_2
•  N_2
Solution
(c) F_2 is most reactive due to (1) highest electronegativity. (2)low bond dissociation energy (3)high heat of hydration of F^-ion

Q10.   Which will not conduct electricity?
•  Aqueous KOH solution
•   Fused NaCl
•  Graphite
•  KCl in solid state
Solution
(d) Ionic compounds conduct current only in fused state. ## Want to know more

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