CHEMICAL-BONDING -QUIZ-10

CHEMISTRY CHEMICAL BONDING 

QUIZ-10

Dear Readers,

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Q1. In the molecule CH≡C-CH=CH₂, the hybridisation of C – C bond is

•  sp²- sp
•  sp³- sp³
•  sp²- sp²
•  sp³-sp

Solution
sp sp sp² sp² CH≡C-CH=CH₂ 

 Hence, carbon atom bonded to each other by single (C-C) are sp and sp² hybrid.

Q2.Which of the following is least ionic?

•  CaF₂
•  CaBr₂
•  CaI₂
•  CaCl₂

Solution
Larger is anion, more is covalent character.

Q3.  Which are true statements among the following? (1) PH₅ and BiCl₅ does not exist (2 ) pπ—dπ bonds are present in SO₂ (3) Electrons travel with speed of light (4) SeF₄ and CH₄ has same shape (5) I₃⁺ has bent geometry

•  1, 3
•  1, 2, 5
•  1, 3, 5
•  1, 2, 4

Solution
These are facts.

Q4. The charge/size ratio of a cation determines its polarising power. Which one of the following sequences represents the increasing order of the polarising power of the cationic species, K⁺,Ca²⁺,Mg²⁺,Be²⁺?

•  Mg²⁺< Be²⁺< K⁺< Ca²⁺
•  Be²⁺< K⁺< Ca²⁺< Mg²⁺
•  K⁺< Ca²⁺< Mg²⁺< Be²⁺
•  Ca²⁺< Mg²⁺< Be²⁺< K⁺

Solution
Higher the charge/size ratio, more is the polarising power.

 K⁺< Ca²⁺< Mg²⁺< Be²⁺

Q5.The electron affinity for inert gases is likely to be:

•  High
•  Small
•  Zero
•  Positive

Solution
  No scope for addition in completely filled valence orbitals of inert gases.

Q6. The only molecule having dipole moment is

•  2,2-dimethylpropane
•  trans-2-pentene
•  trans-3-hexene
•  2,2,3,3-tetramethylbutane

Solution

Q7.Paramagnetism is exhibited by molecules:

• Not attracted into a magnetic field
•  Containing only paired electrons
•  Carrying a positive charge
•  Containing unpaired electrons

Solution
Unpaired electrons give rise to paramagnetism.

Q8.Ionization potential of Na would be numerically the same as:

•  Electron affinity of Na⁺
•  Electronegativity of Na⁺
•  Electron affinity of He
•  Ionization potential of Mg

Solution
Na⟶Na⁺+e;IE of Na=+ve 

 Na⁺+e⟶Na; EA of Na⁺=-ve 

 Both are equal but opposite in nature.

Q9.The correct ionic radii order is:

•  N^3->O^2->F^->Na⁺>Mg²⁺>Al³⁺
•  N^3-> Na⁺ >O^2->F^->Mg²⁺>Al³⁺
•  Na⁺>O^2->N^3->F^->Mg²⁺>Al³⁺
•  O^2->F^->Na⁺>N^3->Mg²⁺>Al³⁺

Solution
Addition of electrons to an atom results an increase in its size.

Q10. Which of the following is largest ion?

•  Na⁺
•  Mg²⁺
•  O^2-
•  F^-

Solution
Anions are larger in size than their parent atom.