Periodic table Quiz-09

Periodic table Quiz-09

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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
  
•  Increasing metallic radius: Li

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.