Equilibrium
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What will be the correct order of vapour pressure of water, acetone and ether at 30°C. Given that among these compounds, water has maximum boiling point and ether has minimum boiling point?
(i) Water < ether < acetone
(ii) Water < acetone < ether
(iii) Ether < acetone < water
(iv) Acetone < ether < water
What will be the correct order of vapour pressure of water, acetone and ether at 30°C. Given that among these compounds, water has maximum boiling point and ether has minimum boiling point?
(i) Water < ether < acetone
(ii) Water < acetone < ether
(iii) Ether < acetone < water
(iv) Acetone < ether < water
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (ii)
Greater the boiling point, lower will be the vapour pressure.
Upvote 
On increasing the pressure, in which direction will the gas phase reaction proceed to re-establish equilibrium, is predicted by applying the Le Chatelier’s principle. Consider the reaction.
N2 (g) + 3H2 (g) ⇌2NH3 (g)
Which of the following is correct, if the total pressure at which the equilibrium is established, is increased without changing the temperature?
(i) K will remain same
(ii) K will decrease
(iii) K will increase
(iv) K will increase initially and decrease when pressure is very high
On increasing the pressure, in which direction will the gas phase reaction proceed to re-establish equilibrium, is predicted by applying the Le Chatelier’s principle. Consider the reaction.
N2 (g) + 3H2 (g) ⇌2NH3 (g)
Which of the following is correct, if the total pressure at which the equilibrium is established, is increased without changing the temperature?
(i) K will remain same
(ii) K will decrease
(iii) K will increase
(iv) K will increase initially and decrease when pressure is very high
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option(i)
The given reaction is :-
N2 (g) + 3H2 (g) ?2NH3 (g)
A/C to vart Hoff's eqn,
=
K is dependent on temperature. As temperature remains constant at equilibrium, so K will remain constant in the given conditio
Upvote Which of the following options will be correct for the stage of half completion of the reaction A ⇌ B.
(i) ∆Gᶱ = 0
(ii) ∆Gᶱ> 0
(iii) ∆Gᶱ< 0
(iv) ∆Gᶱ= –RT ln2
Which of the following options will be correct for the stage of half completion of the reaction A ⇌ B.
(i) ∆Gᶱ = 0
(ii) ∆Gᶱ> 0
(iii) ∆Gᶱ< 0
(iv) ∆Gᶱ= –RT ln2
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option(i)
When the reaction is half completed, [A] = [B].
Thus, [B][A]=1
?G0=−RTInK=−RTIn(1)=0
Upvote Ka for CH3COOH is 1.8 × 10–5 and K b for NH4OH is 1.8 × 10–5 . The pH of ammonium acetate will be
(i) 7.005
(ii) 4.75
(iii) 7.0
(iv) Between 6 and 7
Ka for CH3COOH is 1.8 × 10–5 and K b for NH4OH is 1.8 × 10–5 . The pH of ammonium acetate will be
(i) 7.005
(ii) 4.75
(iii) 7.0
(iv) Between 6 and 7
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option(iii)
The equation for weak acid and weak base is given as-
pH=7+ ?(pKa?−pKb?)
Ka=1.8×10-5
pKa=−log (1.8×10-5) =5−log1.8 =4.744
pKb?=−log (1.8×10-5) =4.744
pH=7+ ?(pKa?−pKb?) =7
Upvote What will be the value of pH of 0.01 mol dm–3 CH3COOH (Ka = 1.74 × 10–5 )?
(i) 3.4
(ii) 3.6
(iii) 3.9
(iv) 3.0
What will be the value of pH of 0.01 mol dm–3 CH3COOH (Ka = 1.74 × 10–5 )?
(i) 3.4
(ii) 3.6
(iii) 3.9
(iv) 3.0
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (i)
pH for weak acid is given by the following equation:
pH= [pKa−logC]
= [−log (1.74×10−5)−log0.01]
=3.4
Upvote In which of the following solvents is silver chloride most soluble?
(i) 0.1 mol dm–3 AgNO3 solution
(ii) 0.1 mol dm–3 HCl solution
(iii) H2O
(iv) Aqueous ammonia
In which of the following solvents is silver chloride most soluble?
(i) 0.1 mol dm–3 AgNO3 solution
(ii) 0.1 mol dm–3 HCl solution
(iii) H2O
(iv) Aqueous ammonia
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (iv)
Aqueous ammonia will absorb chloride ions and thus the equilibria will shift in forward direction and solubility of silver chloride will increase.
Upvote Which of the following will produce a buffer solution when mixed in equal volumes?
(i) 0.1 mol dm–3 NH4OH and 0.1 mol dm–3 HCl
(ii) 0.05 mol dm–3 NH4OH and 0.1 mol dm–3 HCl
(iii) 0.1 mol dm–3 NH4OH and 0.05 mol dm–3 HCl
(iv) 0.1 mol dm–3 CH4COONa and 0.1 mol dm–3 NaOH
Which of the following will produce a buffer solution when mixed in equal volumes?
(i) 0.1 mol dm–3 NH4OH and 0.1 mol dm–3 HCl
(ii) 0.05 mol dm–3 NH4OH and 0.1 mol dm–3 HCl
(iii) 0.1 mol dm–3 NH4OH and 0.05 mol dm–3 HCl
(iv) 0.1 mol dm–3 CH4COONa and 0.1 mol dm–3 NaOH
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (iii)
When 0.1 mol dm-3 NH4OH and 0.05 mol dm-3 HCl react total amount of HCl reacts with NH4OH to form NH4Cl and some NH4OH will be left unreacted. Thus, the resultan
Upvote Acidity of BF3 can be explained on the basis of which of the following concepts?
(i) Arrhenius concept
(ii) Bronsted Lowry concept
(iii) Lewis concept
(iv) Bronsted Lowry as well as Lewis concept
Acidity of BF3 can be explained on the basis of which of the following concepts?
(i) Arrhenius concept
(ii) Bronsted Lowry concept
(iii) Lewis concept
(iv) Bronsted Lowry as well as Lewis concept
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (iii)
BF3 is an electron deficient species that is why it is a Lewis acid. (all Lewis acid can accept a pair of electrons.
Upvote <p><strong>Acidity of BF<sub>3</sub> can be explained on the basis of which of the following concepts?</strong></p>
<p><strong>(i)</strong> Arrhenius concept</p>
<p><strong>(ii)</strong> Bronsted Lowry concept</p>
<p><strong>(iii)</strong> Lewis concept</p>
<p><strong>(iv)</strong> Bronsted Lowry as well as Lewis concept</p>
Ka1 , Ka2 and Ka3 are the respective ionisation constants for the following reactions.
H2S H+ + HS
HS– H+ + S2
H2S 2H+ + S2
The correct relationship between is Ka1 , Ka2 and Ka3
- Ka3= Ka1 × Ka2
- Ka3= Ka1 + Ka2
- Ka3= Ka1 – Ka2
- Ka3= Ka1 / Ka2
Ka1 , Ka2 and Ka3 are the respective ionisation constants for the following reactions.
H2S H+ + HS
HS– H+ + S2
H2S 2H+ + S2
The correct relationship between is Ka1 , Ka2 and Ka3
- Ka3= Ka1 × Ka2
- Ka3= Ka1 + Ka2
- Ka3= Ka1 – Ka2
- Ka3= Ka1 / Ka2
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option(i)
H2S?H+ +HS− Ka1
HS−?H++S2− Ka2
H2S?2H++S2− Ka3
Ka1=
Ka2=
Ka3=Ka1.Ka2
Upvote