Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven
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New answer posted
4 months agoContributor-Level 10
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: BF3 does not have a proton but still it acts as a Lewis acid as it is an electron pair acceptor and reacts with NH3by accepting its lone pair of electrons. The reaction can be represented by Coordinate bond is formed between BF3 and NH3. It can be represented as-
[ BF3 ← :NH3]
Nitrogen acts as lone pair donator in this combination
New answer posted
4 months agoContributor-Level 10
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: Conductance of a solution depends upon the number of ions present in the solution since sodium chloride is an ionic compound when mixed in water it ionizes completely forming an aqueous electrolytic solution. Hence, the solution conducts electricity while sugar being a non-electrolyte does not ionize in water and when concentration of NaCl is increased, more Na+ and Cl- ions will be produced. Hence, conductance increases.
New answer posted
4 months agoContributor-Level 10
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: Conjugate acid and conjugate base can be shown as-
HCl(aq) + H2O (l) ? H3O+(aq) + Cl-(aq)
acid base conjugate conjugate
acid base
New answer posted
4 months agoContributor-Level 10
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: (a) As we know,
ΔG= ?G? +RTlnQ
?G? = Change in free energy as the reaction proceeds,
ΔG = Standard free energy change,
Q = Reaction quotient,
R = Gas constant,
T = Absolute temperature.
Since, ?G? =−RTlnK
∴ΔG=−RTlnK + RTlnQ = RTlnKQ?
If Q
If Q=K, ΔG=0, reaction is in equilibrium and no net reaction is there.
(b) When we increase the pressure equilibrium will shift in forward direction it means Q
Types of Chemical Reactions :
There are 4 main types of chemical reactions. These are-
- Combination
New answer posted
4 months agoContributor-Level 10
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: The equation can be written as-
Ap+x + Bq- y ? xAp+ (aq) + yBq-
S moles of A and B dissolves to give x S moles of Ap+ and y S moles of Bq-.
Ksp = [Ap+]x [Bq-]y = [x5]x [y5]y
= xx y y 5 x+y
New answer posted
4 months agoContributor-Level 10
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: According to Le Chatelier's principle, when we raise the temperature, it shifts the equilibrium to left and decreases the equilibrium concentration of ammonia since it is an exothermic reaction. In other words, low temperature and high pressure is favourable for high yield of ammonia. There will be no change in equilibria on addition of argon (Ar).
New answer posted
4 months agoContributor-Level 10
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: The values of Kc and Qc are itself sufficient to explain the direction of reaction and less than or greater than one another decides the direction in which reaction will proceed as follows-
(i) As Qc < Kc, the reaction proceeds in the forward direction.
(ii) If Qc > Kc, the reaction will proceed in the direction of reactants (reverse reaction).
(iii) If Qc = Kc, no net reaction occurs.
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