CHEMICAL-BONDING-QUIZ-5

CHEMISTRY CHEMICAL BONDING QUIZ-5

Dear Readers,

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Q1. The number of ions formed when a molecule of K₄ Fe(CN)₆ dissociates is:

•  4
•  5
•  6
•  2

Solution
K₄ Fe(CN)₆⟶4K⁺+Fe(CN)₆^4-.

Q2.Na⁺,Mg²⁺,Al³⁺,Si⁴⁺are isoelectronics. Their ionic size follows the order:

•  
  
  
•  
  
  
•  
  
  
•  
  
  

Solution
Effective nuclear charge increases in this order.

Q3.  Which is correct order for electron gain enthalpy?

•  S< O< Cl< F
•  O< S< F< Cl
•  Cl< F< S< O
•  F< Cl< O< S

Solution
Electron gain enthalpy of Cl is maximum.

Q4. What is the reason for unusual high b.p. of water?

•  Due to the presence of H⁺ and OH^- ions in water
•  Due to dipole – dipole interactions
•  Due to London forces
•  Strong London Forces

Solution
High boiling point. of water is due to dipole-dipole interaction.

Q5.In which of the following pairs of molecules/ions, the central atom has sp²-hybridization?

•  NO₂ and NH₃
•  BF₃ and NO₂^-
•  NH₂^- and H₂ O
•  BF₃ and NH₂^-

Solution
  BF₃:sp² NO₂^- ∶sp² NH₃ ∶sp³ NH₂^-:sp³ H₂ O∶sp³

Q6. The maximum number of hydrogen bonds that a molecule of water can have is

•  1
•  2
•  3
•  4

Solution

Q7.Which does not form two or more chlorides?

• Na
•  Hg
•  Cu
•  Fe

Solution
Only Na shows +1 oxidation state. 

Rest all have +1, +2(Hg), +1, +2 (Cu) and +2, +3 (Fe) oxidation states.

Q8. The energy of σ 2s-orbital is greater than σ*1s orbital because:

•  σ 2s orbital is bigger than σ*1s orbital
•  σ 2s orbital is a bonding orbital whereas, σ*1s is an antibonding orbital
•  σ 2s orbital has a greater value of n than σ*1s orbital
•  None of the above

Solution
A reason for the given fact.

Q9.Which one of the following species is diamagnetic in nature?

•  H₂^-
•  H₂⁺
•  H₂
•  He₂⁺

Solution

Q10. The lattice energy order for lithium halide is:

•  LiF>LiCl>LiBr>LiI
•  LiCl>LiF>LiBr>LiI
•  LiBr>LiCl>LiF>LiI
•  LiI>LiBr>LiCl>LiF

Solution
Smaller is size of anion, lesser is its polarization, more is ionic nature, more is lattice energy.