NTSE Chemistry Chemical Bonding MCQs

Question: What is the valency of iron in FeCO3 ?

• a) 1
• b) 2
• c) 3
• d) 4

Answer: 2

Question: A species (X) contains 9 protons, 10 electrons and 11 neutrons. It is -

• a) a neutral atom.
• b) an isotope.
• c) a cation.
• d) an anion.

Answer: an anion.

Question: A symbol not only represents the name of the element but also its-

• a) Atomic mass.
• b) Atomic number.
• c) Atomicity.
• d) Atomic volume.

Answer: Atomic mass.

Question: Which of the following element will become stable after losing and electron ?

• a) Helium
• b) Iodine
• c) Sodium
• d) Oxygen

Answer: Sodium

Question: Co-ordination bond is formed

• a) By exchange of electrons.
• b) By equal sharing of electrons.
• c) By one way sharing of electrons.
• d) None of these.

Answer: By one way sharing of electrons.

Question: Polar solvent is -

• a) Carbon tetra chloride
• b) Water
• c) Benzene
• d) None of these

Answer: Water

Question: Which of the following is not true for the covalent compounds ?

• a) Weak vanderwaal’s forces are present between the molecules of covalent compounds.
• b) They have high b.p. and m.p.
• c) They are insulators of electricity.
• d) They are soluble in non-polar solvent.

Answer: They have high b.p. and m.p.

Question: In which of the following molecules, co-ordination bond is present ?

• a) F2
• b) O3  
• c) O2                          
• d)P4 

Answer:  O3  

Question: Ionic compound is -

• a) NaCI
• b) H2O     
• c) CO2 
• d) NH3

Answer: NaCI

Question: The reason of bonding in ionic compounds is -

• a) Sharing of electrons
• b) Repulsion force
• c) Attraction force
• d) None of these

Answer: Attraction force

More Questions...................

Question: The element capable of gaining as well as losing and electron is -

• a) Hg
• b) Ca
• c) Ag
• d) H

Answer: H

Question: Which of the following compounds is covalent ?

• a) H2   
• b) CaO
• c) KCI
• d) Na2S

Answer: H2   

Question: Valence electrons in outermost shell of X and Y atoms are 2 nad 6 respectively. The compound formed by combination of X and Y has a formula -

• a) XY2
• b) Y2X6                     
• c) YX2
• d) XY

Answer: XY

Question: In which of the following molecules, atomic orbitals used in the formation of bonds are sp2 hybridised ?

• a) H2S
• b) BCI3
• c) PCI3    
• d) All the above

Answer: BCI3

Question: In which of the following compounds 8 valence electrons are present in every atom ?

• a) IF5  
• b) C2H4
• c) SiF4
• d) KH

Answer: SiF4

Question: Which of the following has covalent bond ?

• a) Na2S       
• b) AICI3  
• c) NaH
• d) MgCI2

Answer: AICI3  

Question: Which of the following contains both covalent and ionic bonds ?

• a) CCI4 
• b) CaCI2  
• c) NH4CI
• d) H2O

Answer: NH4CI

Question: The bond between two identical non-metal atoms has a pair of electrons -

• a) unequally shared between the two.
• b) transferred fully from one the another.
• c) with identical spins.
• d) equally shared between the two.

Answer: equally shared between the two.

Question: Which of the following contains both ionic and covalent bond ?

• a) NaCI
• b) KCN
• c) C2
• d) CH3COOH

Answer: KCN

Question: The bond that exists between NH3 and BF3 is called -        

• a) Electrovalent
• b) Covalent
• c) Coordinate
• d) Hydrogen

Answer: Coordinate

Question: Which of the following contains both ionic and covalent bond ?

• a) NaCI
• b) KCN
• c) C2 
• d) CH3COOH

Answer: KCN

Question: The bond that exists between NH3 and BF3 is called -          

• a) Electrovalent
• b) Covalent
• c) Coordinate
• d) Hydrogen

Answer: Coordinate

Question: In which of the following multiple bonds are present -

• a) CI2 
• b) N2
• c) CH4  
• d) H2

Answer: N2

Question: The total number of electrons in one molecule of CO2 is -

• a) 22
• b) 44
• c) 66
• d) 88

Answer: 22

Question: What is the empirical formula of vanadium oxide if 2.74 g of metal oxide contains 1.53 g of metal ?[Atomic weight of V = 52]

• a) V2O3    
• b)  VO
• c) V2O5   
• d) V2O7

Answer: V2O5   

Question: The simplest formula of a compound containing 50% X (atomic mass 10 u) and 50% Y (atomic mass 20 u) is -      

• a) XY2
• b) X2Y 
• c) X2Y3 
• d) XY

Answer: X2Y 

Question: A sulphide of iron contains 46.5% of Fe by weight. The empirical formula of the sulphide is -

• a) FeS
• b) Fe2S
• c) FeS2   
• d) Fe2S3

Answer: FeS2   

Question: An iron compound yielded C = 64.4%, H = 5.5% and Fe = 29.9%. The simple formula of the compound is -

• a) C₁₀H₁₀Fe  
• b) C₉H₁₀Fe   
• c) C₁₀H₉Fe
• d) C₉H₉Fe

Answer: C₁₀H₁₀Fe  

Question: Butyric acid contains only C, H and O. 4.24 mg sample of butyric acid on burning completely gives 8.45 mg of CO2 and 3.46 mg of H2O. If the molecular mass of butyric acid is 88 u, then its molecular formula is -

• a) C2H8O2 
• b) C2H4O 
• c) C4H8O2   
• d) C4H8O4

Answer: C4H8O2   

Question: Two oxides of a metal 30.0% and 27.6% of oxygen respectively. If the formula of the first oxide is M2O3, the formula of the second oxide is -

• a) M₃O₄
• b) M₄O₃ 
• c) M₂O₃ 
• d) M₃O₂

Answer: M₃O₄

Question: A compound has an empirical formulary C2H4O. An analysis gave a value of 132.16 for its molecular mass. The correct molecular formula of the compound is -

• a) C4H4O5 
• b) C4H8O5  
• c)  C6H₁₀O3  
• d) C6H₁₂O3

Answer: C4H8O5  

Question: An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. The molecular formula of the compound is-

• a) C3H8O2  
• b) C6H₁₀O4 
• c) C6H₁₉O  
• d)  C4H₁₀O2

Answer: C6H₁₀O4 

Question: Expansion of octet rule is observed is-

• a) BF3
• b) PCI5 
• c) AICI3  
• d) H2O 

Answer: PCI5 

Question: Both ionic and covalent bonds are present in -

• a) NaOH
• b) SO2
• c) CH4 
• d) KCI

Answer: NaOH

Question: Most favorable conditions for ionic bond are -

• a) Low ionization potential of one atom and high electron affinity of other atom.
• b) High ionization potential of one atom and high electron affinity of other atom.
• c) Low ionization potential of one atom and low electron affinity of other atom.
• d) High ionization potential of one atom an low electron affinity of other atom.

Answer: Low ionization potential of one atom and high electron affinity of other atom.