Ncert Solutions Chemistry Class 11th
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Hydrogen bonds are formed in many compounds e.g., H2O, HF, NH3 . The boiling point of such compounds depends to a large extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of above compounds is :
(i) HF > H2O > NH3
(ii) H2O > HF > NH3
(iii) NH3 > HF > H2O
(iv) NH3 > H2O > HF
Hydrogen bonds are formed in many compounds e.g., H2O, HF, NH3 . The boiling point of such compounds depends to a large extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of above compounds is :
(i) HF > H2O > NH3
(ii) H2O > HF > NH3
(iii) NH3 > HF > H2O
(iv) NH3 > H2O > HF
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (ii)
The size and the electronegativity are the main factors on which the strength of a compound depends on. As the size of the atom decreases, the electronegativity increases and thus the hydrogen-bonding becomes stronger
Upvote 
The types of hybrid orbitals of nitrogen in NO2 + , NO3 – and NH4 + respectively are expected to be
(i) sp, sp3 and sp2
(ii) sp, sp2 and sp3
(iii) sp2, sp and sp3
(iv) sp2, sp3 and sp
The types of hybrid orbitals of nitrogen in NO2 + , NO3 – and NH4 + respectively are expected to be
(i) sp, sp3 and sp2
(ii) sp, sp2 and sp3
(iii) sp2, sp and sp3
(iv) sp2, sp3 and sp
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (ii)
The hybrid orbitals of nitrogen in the given species will be confirmed by knowing the hybridization. In NO2+ the central nitrogen atom is sp hybridized as it has a linear shape. The molecule NO3- is sp2 du
Upvote Polarity in a molecule and hence the dipole moment depends primarily on electronegativity of the constituent atoms and shape of a molecule. Which of the following has the highest dipole moment?
(i) CO2
(ii) HI
(iii) H2O
(iv) SO2
Polarity in a molecule and hence the dipole moment depends primarily on electronegativity of the constituent atoms and shape of a molecule. Which of the following has the highest dipole moment?
(i) CO2
(ii) HI
(iii) H2O
(iv) SO2
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (iii)
The dipole moment of the molecule depends on the difference in the electronegativity of the atoms present in the structure. The dipole moment of CO2 is 0, HI is 0.38, H2O is 1.84 and SO2 is 1.62.
As the oxygen atom is
Upvote Isostructural species are those which have the same shape and hybridisation. Among the given species identify the isostructural pairs.
(i) [NF3 and BF3 ]
(ii) [BF4 and NH4+ ]
(iii) [BCl3 and BrCl3]
(iv) [NH3 and NO3– ]
Isostructural species are those which have the same shape and hybridisation. Among the given species identify the isostructural pairs.
(i) [NF3 and BF3 ]
(ii) [BF4 and NH4+ ]
(iii) [BCl3 and BrCl3]
(iv) [NH3 and NO3– ]
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (ii)
In a molecular structure if a central atom has the same hybridization as the central atom of another molecular species, then the two structures are known as isostructural species.
(i) In NF3 the central nitrogen atom
Upvote What is meant by the term average bond enthalpy? Why is there difference in bond enthalpy of O—H bond in ethanol (C2H5OH) and water?
What is meant by the term average bond enthalpy? Why is there difference in bond enthalpy of O—H bond in ethanol (C2H5OH) and water?
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: The average bond enthalpy is defined as the ratio of total bond dissociation enthalpy to the number of bonds broken in the structure.
The identical O- H bonds in water molecule does not have the same bond enthalpies. According
Upvote All the C—O bonds in carbonate ion (CO32– ) are equal in length. Explain.
All the C—O bonds in carbonate ion (CO32– ) are equal in length. Explain.
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: All the C-Obonds in carbonate ion (CO32-) are equal in length due to the equivalent resonance of all the three carbon-oxygen bonds gets a double bond character atleast once. This type of double bond character happened througho
Upvote Predict the shapes of the following molecules on the basis of hybridisation.
BCl3, CH4 , CO2, NH3
Predict the shapes of the following molecules on the basis of hybridisation.
BCl3, CH4 , CO2, NH3
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: In compound BCl3, Boron has sp2-hybridisation and the shape is Triangular Planar.
In methane CH4, Carbon has sp3 -hybridization and shape are Tetrahedral.
In carbon dioxide CO2, carbon has sp-hybridisation and shape is Linear.
In
Upvote Draw the resonating structure of
(i) Ozone molecule
(ii) Nitrate ion
Draw the resonating structure of
(i) Ozone molecule
(ii) Nitrate ion
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: (i)
(ii) 
Upvote Elements X, Y and Z have 4, 5 and 7 valence electrons respectively.
(i) Write the molecular formula of the compounds formed by these elements individually with hydrogen.
(ii) Which of these compounds will have the highest dipole moment?
Elements X, Y and Z have 4, 5 and 7 valence electrons respectively.
(i) Write the molecular formula of the compounds formed by these elements individually with hydrogen.
(ii) Which of these compounds will have the highest dipole moment?
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: (i) According to the electronic configuration, a total of 8 electrons must be present in the valence shell of an element. Element X has 4 valence electrons, so it will share the remaining 4 electrons for the formation of the
Upvote Group the following as linear and non-linear molecules :
H2O, HOCl, BeCl2, Cl2O
Group the following as linear and non-linear molecules :
H2O, HOCl, BeCl2, Cl2O
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: BeCl2 has a linear structure
HOCl is also non-linear in structure.
H2O has a V-shaped structure.
Cl2O has a V-shaped structure.
Upvote