Class 11 Chemistry - Chapter Chemical Bonding and Molecular Structure NCERT Solutions | Define the bond length.
Define the bond length.
Bond length is defined as the distance between the centres of the nuclei of two bonded atoms in a molecule. It represents equilibrium inter-nuclear separation distance of the bonded atoms in a molecule. The length of the bond is determined by the number of bonded electrons (the bond order). The higher the bond order, the stronger the pull between the two atoms and the shorter the bond length. Bond lengths are expressed in terms of Angstrom (10-10 m) or picometer (10-12 m) and are measured by spectroscopic X-ray diffractions and electron-diffraction techniques.
In an ionic compound, the bond length is the sum of the ionic radii of the constituting atoms (d = r+ + r-). In a covalent compound, it is the sum of their covalent radii (d = rA + rB).
More Questions From Class 11 Chemistry - Chapter Chemical Bonding and Molecular Structure
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What is meant by the term bond order? Calculate the bond order of: N2, O2,O2+,and O2-.
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Use molecular orbital theory to explain why the Be2 molecule does not exist.
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Explain the formation of H2 molecule on the basis of valence bond theory.
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Compare the relative stability of the following species and indicate their magnetic properties:
O2,O2+,O2- (superoxide), O22-(peroxide)
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Describe the hybridisation in case of PCl5. Why are the axial bonds longer as compared to equatorial bonds?
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Which out of NH3 and NF3 has higher dipole moment and why?
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Explain why BeH2 molecule has a zero dipole moment although the Be–H bonds are polar.
- Q:-
Discuss the shape of the following molecules using the VSEPR model:
BeCl2, BCl3, SiCl4, AsF5, H2S, PH3
- Q:-
Write Lewis symbols for the following atoms and ions:
S and S2–; Al and Al3+; H and H–
- Q:-
Describe the change in hybridisation (if any) of the Al atom in the following reaction.
Popular Questions of Class 11 Chemistry
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- Q:-
What are hybridisation states of each carbon atom in the following compounds ?
(i) CH2=C=O,
(ii) CH3CH=CH2,
(iii) (CH3)2CO,
(iv) CH2=CHCN,
(v) C6H6
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Calculate the molecular mass of the following:
(i) H2O
(ii) CO2
(iii) CH4 - Q:-
Assign oxidation number to the underlined elements in each of the following species:
(a) NaH2PO4
(b) NaHSO4
(c) H4P2O7
(d) K2MnO4
(e) CaO2
(f) NaBH4
(g) H2S2O7
(h) KAl(SO4)2.12 H2O
- Q:-
What is the basic theme of organisation in the periodic table?
- Q:-
Choose the correct answer. A thermodynamic state function is a quantity
(i) used to determine heat changes
(ii) whose value is independent of path
(iii) used to determine pressure volume work
(iv) whose value depends on temperature only. - Q:-
A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased.
a) What is the initial effect of the change on vapour pressure?
b) How do rates of evaporation and condensation change initially?
c) What happens when equilibrium is restored finally and what will be the final vapour pressure? - Q:-
Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.
Recently Viewed Questions of Class 11 Chemistry
- Q:-
Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?
- Q:-
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.
(a) C6H5OH
(b) C6H5NO2
(c) CH3CH=CHCHO
(d) C6H5–CHO
(e) C6 H5 - C+H2
(f) CH3CH = CHC+H2
- Q:-
When metal X is treated with sodium hydroxide, a white precipitate (A) is obtained, which is soluble in excess of NaOH to give soluble complex (B). Compound (A) is soluble in dilute HCl to form compound (C). The compound (A) when heated strongly gives (D), which is used to extract metal. Identify (X), (A), (B), (C) and (D). Write suitable equations to support their identities.
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How do you count for the following observations?
(a) Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction.
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Determine the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively. Given that the molar mass of the oxide is 159.69 g mol–1.
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Give a brief description of the principles of the following techniques taking an example in each case.
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(b) Distillation
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Calculate the molecular mass of the following:
(i) H2O
(ii) CO2
(iii) CH4 - Q:-
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