Ncert Solutions Chemistry Class 11th
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Which of the following hydrides is electron-precise hydride?
(i) B2H6
(ii) NH3
(iii) H2O
(iv) CH4
Which of the following hydrides is electron-precise hydride?
(i) B2H6
(ii) NH3
(iii) H2O
(iv) CH4
This is a multiple choice answer as classified in NCERT Exemplar
Option (iv)
CH4
These hydrides have the required number of electrons to write their conventional Lewis structures.
Upvote 
Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is
(i) LiH > NaH > CsH > KH>RbH
(ii) LiH < NaH < KH < RbH < CsH
(iii) RbH > CsH > NaH > KH > LiH
(iv) NaH > CsH > RbH > LiH > KH
Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is
(i) LiH > NaH > CsH > KH>RbH
(ii) LiH < NaH < KH < RbH < CsH
(iii) RbH > CsH > NaH > KH > LiH
(iv) NaH > CsH > RbH > LiH > KH
This is a multiple choice answer as classified in NCERT Exemplar
Option (ii)
LiH < NaH < KH < RbH < CsH
In ionic hydride as it is formed by the s-Block element, down the group, electropositive character increases.
Upvote Why does H+ ion always get associated with other atoms or molecules?
(i) Ionisation enthalpy of hydrogen resembles that of alkali metals.
(ii) Its reactivity is similar to halogens.
(iii) It resembles both alkali metals and halogens.
(iv) Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to smal size it cannot exist free.
Why does H+ ion always get associated with other atoms or molecules?
(i) Ionisation enthalpy of hydrogen resembles that of alkali metals.
(ii) Its reactivity is similar to halogens.
(iii) It resembles both alkali metals and halogens.
(iv) Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to smal size it cannot exist free.
This is a multiple choice answer as classified in NCERT Exemplar
option (iv)
Loss of an electron from a hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to its small size it cannot exist free.
Loss of the electron from hydrogen atom results in nucleus size (
Upvote 1. Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect?
(i) Its tendency to lose an electron to form a cation.
(ii) Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.
(iii) Its low negative electron gain enthalpy value.
(iv) Its small size
1. Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect?
(i) Its tendency to lose an electron to form a cation.
(ii) Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.
(iii) Its low negative electron gain enthalpy value.
(iv) Its small size
This is a multiple choice answer as classified in NCERT Exemplar
option (ii)
Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.
Like halogens (with ns2np5 configuration belonging to the seventeenth group of the periodic table), it is short by one elec
Upvote Write two reactions to explain the amphoteric nature of water.
Write two reactions to explain the amphoteric nature of water.
This is a short answer type question as classified in NCERT Exemplar
H2O (l)+NH3 (aq) → OH- (aq)+NH4+ (aq)
H2O (l)+H2S (aq) → H3O+ (aq)+HS- (aq)
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2F2 (g)+2H2O → 4H+ (aq)+4F- (aq)+O2 (g)
Upvote How will you account for the 104.5° bond angle in water?
How will you account for the 104.5° bond angle in water?
This is a short answer type question as classified in NCERT Exemplar
In water hybridisation of oxygen is sp3. Angle should be109o (approx.) but due to LP - LP repulsion bond angle reduces to 104.5°.
Upvote Phosphoric acid is preferred over sulphuric acid in preparing hydrogen peroxide from peroxides. Why?
Phosphoric acid is preferred over sulphuric acid in preparing hydrogen peroxide from peroxides. Why?
This is a short answer type question as classified in NCERT Exemplar
Because H2SO4 can activate the decomposition of H2O2.
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With soap, hard water generates scum/precipitate. Soap containing sodium stearate (C117H35COONa) interacts with hard water to form calcium and magnesium stearate (Ca/Mg stearate). As a result, it is unsuitable for laundering. Becaus
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Hydrogen peroxide is stored in wax lined bottles because decomposes slowly on exposure to light.
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