Periodic table Quiz-02

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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.   The structure of XeF_4 is:
  •  Planar
  •  Tetrahedral
  •  Square planar
  •  Pyramidal
(c) XeF_4 has sp^3 d^2-hybridized Xe atom having two lone pair of electrons and thus, octahedral geometry changes to square planar due to lone pair effect.

Q2.   The formation of the oxide ion O^(2-) (g) requires first an exothermic and then an endothermic step as shown below O(g)+e^-=O^- (g); ∆H^o=-142 kJ mol^(-1) O^- (g)+e^-=O^(2-) (g),∆H^o=844 kJ mol^(-1) This is because
  •  O^- ion will tend to resist the addition of another electron
  •  Oxygen has high electro affinity
  •   Oxygen is more electronegative
  •  O^- ion has comparatively larger size than oxygen atom
(a) The addition of second electron in an atom or ion is always endothermic as the incoming electron experience the greater force of repulsion

Q3.   Which among the following has the largest dipole moment?
  •  NH_3
  •  H_2 O
  •   HI
  •  SO_3
(b) It is a fact.

Q4.   If the electronegativity difference between two atoms A and B is 2.0, then the percentage of covalent character in the molecule is
  •  54%
  •  46%
  •  23%
  •  72%
(b) According to Hannay and Smith equation ∴% ionic character =16(x_A-x_B )+3.5(x_A-x_B )^2 Where, x_A and x_Bare the electronegative of the atoms A and B respectively. ∴ % ionic charecter=16(2)+3.5(2)^2 =32+14=46%

Q5.   Which of the following sequence correctly represents the decreasing acidic nature of oxides?
  •  Li_2 O>BeO>CO_2>N_2 O_3>B_2 O_3
  •  CO_2>N_2 O_3>B_2 O_3>LiO>BeO
  •  N_2 O_3>CO_2>B_2 O_3>BeO>Li_2 O
  •  CO_2>BeO>Li_2 O>B_2 O_3>N_2 O_3
(c) On passing from left to right in a period, acidic character of the normal oxides of the element goes on increasing with increases in electronegativity

Q6.   Which of the following ion is the smallest ion?
  •  O_2
  •  O_2^+
  •  O_2^-
  •  O_2^(2-)
(b) Cation has small size than parent atom and anion has larger size than parent atom

Q7.   Which has sp^2-hybridization?
  •  CO_2
  •  SO_2
  •  N_2 O
  •  CO
(b) SO_2 has sp^2-hybridization.

Q8.   Greater the dipole moment:
  •  Grater is the ionic nature
  •  Lesser the polarity
  •  Smaller the ionic nature
  •  None of these
(a) More is the dipole moment more is ionic nature. μ=δ×d; higher is μ, more will be δ on the atom.

Q9.   Covalent radius of Li is 123 pm. The crystal radius of Li will be:
  •  greater than 123 pm
  •  less than 123 pm
  •  +123 pm
  •  equals 123/2 pm
(a) Covalent radius are always smaller than crystal radius as the former involves overlapping region.

Q10.   Which of the following metals exhibits more than one oxidation state?
  •  Na
  •  Mg
  •  Al
  •  Fe
(d) Fe is a transition element, thus exhibits variable oxidation states

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Periodic table Quiz-02
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