Ncert Solutions Chemistry Class 11th
Get insights from 2k questions on Ncert Solutions Chemistry Class 11th, answered by students, alumni, and experts. You may also ask and answer any question you like about Ncert Solutions Chemistry Class 11th
- 2k
Questions
- 0
Discussions
- 0
Active Users
- 29
Followers
Have a question about Ncert Solutions Chemistry Class 11th? Ask our experts
Keep it short & simple. Type complete word. Avoid abusive language.
Calculate the energy required for the process:
He+ (g) → He2+ (g) + e–
The ionisation energy for the H atom in the ground state is 2.18 × 10-18 J atom-1
Calculate the energy required for the process:
He+ (g) → He2+ (g) + e–
The ionisation energy for the H atom in the ground state is 2.18 × 10-18 J atom-1
The expression for the ionization energy atom,
En = (2.18 * 10-18 x Z2) / n2 J atom-1
For H atom, (Z = 1). So,
En =2.18 * 10-18 * (l)2 J atom-1 (given)
For He+ ion (Z = 2). So,
En =2.18 * 10-18 * (2)2 = 8.72 * 10-18 J atom-1 (one electron specie
Upvote 
What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 of He+ spectrum?
What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 of He+ spectrum?
For an atom? = 1/ λ = RH Z2 [ (1/n12) – (1/n22)]
For He+ spectrum: Z = 4, n2 = 4, n1 = 2.
∴? = 1/ λ = RH Z2 [ (1/22) – (1/42)]
= RH 22 [ (1/22) – (1/42)]
= 3RH /4
For hydrogen spectrum:
∴? = 1/ λ = RH 12 [ (1/n12) – (1/n22)] = 3RH /4
=> (1/n12) – (1/n22) = 3/4
This corresponds to n1 = 1 and n2 =2 and means
Upvote Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wavelength associated with the electron revolving around the orbit
Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wavelength associated with the electron revolving around the orbit
According to Bohr’s theory,
mvr = nh / 2π
=> 2πr = nh/mv
=> mv = nh / 2πr - (i)
According to de Broglie equation,
h / λ - (ii)
Comparing equations (i) and (ii)
nh / 2πr = h / λ
=> 2πr = n λ
Thus, the circumference (2πr) of the Bohr orbit for hydrogen atom is an integral multiple of the de Broglie wav
Upvote How many electrons in an atom may have the following quantum numbers?
(a) n = 4; ms = -1/2
(b) n = 3, l = 0.
How many electrons in an atom may have the following quantum numbers?
(a) n = 4; ms = -1/2
(b) n = 3, l = 0.
(a) For n = 4
Total number of electrons = 2n2 = 2 × 16 = 32
Half out of these will have ms = -1/2
∴ Total electrons with ms (-1/2) = 16
(b) For n = 3
l= 0; ml = 0, ms +1/2, -1/2 (two e–)
Upvote From the following sets of quantum numbers, state which are possible. Explain why the others are not possible.
(a) n = 0, l = 0, ml = 0, ms = + ½
(b) n = 1, l = 0, ml = 0, ms = – ½
(c) n = 1, l = 1, ml = 0, ms = + ½
(d) n = 2, l = 1, ml = 0, ms = – ½
(e) n = 3, l = 3, ml = –3, ms = + ½
(f) n = 3, l = 1, ml = 0, ms = + ½
From the following sets of quantum numbers, state which are possible. Explain why the others are not possible.
(a) n = 0, l = 0, ml = 0, ms = + ½
(b) n = 1, l = 0, ml = 0, ms = – ½
(c) n = 1, l = 1, ml = 0, ms = + ½
(d) n = 2, l = 1, ml = 0, ms = – ½
(e) n = 3, l = 3, ml = –3, ms = + ½
(f) n = 3, l = 1, ml = 0, ms = + ½
(a) The set of quantum numbers is not possible because the minimum value of n can be 1 and not zero.
(b) The set of quantum numbers is possible.
(c) The set of quantum numbers is not possible because, for n = 1, l cannot be equal to 1. It can have 0 value.
(d) The set of quantum
Upvote The volume of gas is reduced to half from its original volume. The specific heat will be ______.
(i) Reduce to half
(ii) Be doubled
(iii) Remain constant
(iv) Increase four times
The volume of gas is reduced to half from its original volume. The specific heat will be ______.
(i) Reduce to half
(ii) Be doubled
(iii) Remain constant
(iv) Increase four times
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (iii)
Specific heat capacity is the quantity of heat required to raise the temperature of one unit mass of a substance by one degree Celsius (or 1 Kelvin). That is why it is an intensive property which does not depend on mass.
Upvote The state of a gas can be described by quoting the relationship between___.
(i) Pressure, volume, temperature
(ii) Temperature, amount, pressure
(iii) Amount, volume, temperature
(iv) Pressure, volume, temperature, amount
The state of a gas can be described by quoting the relationship between___.
(i) Pressure, volume, temperature
(ii) Temperature, amount, pressure
(iii) Amount, volume, temperature
(iv) Pressure, volume, temperature, amount
This is a Multiple Choice Questions as classified in NCERT Exemplar
option (i)
Variables like p, V, T are called state variables or state functions because their values depend only on the state of the system and not on how it is reached.
Upvote Which of the following statements is correct?
(i) The presence of reacting species in a covered beaker is an example of open system.
(ii) There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
(iii) The presence of reactants in a closed vessel made up of copper is an example of a closed system.
(iv) The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.
Which of the following statements is correct?
(i) The presence of reacting species in a covered beaker is an example of open system.
(ii) There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
(iii) The presence of reactants in a closed vessel made up of copper is an example of a closed system.
(iv) The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (iii)
The presence of reactants in a closed vessel made of conducting material e.g., copper or steel is an example of a closed system.
Upvote Thermodynamics is not concerned about______.
(i) Energy changes involved in a chemical reaction.
(ii) The extent to which a chemical reaction proceeds.
(iii) The rate at which a reaction proceeds.
(iv) The feasibility of a chemical reaction.
Thermodynamics is not concerned about______.
(i) Energy changes involved in a chemical reaction.
(ii) The extent to which a chemical reaction proceeds.
(iii) The rate at which a reaction proceeds.
(iv) The feasibility of a chemical reaction.
This is a Multiple Choice Questions as classified in NCERT Exemplar
Thermodynamics is not concerned about how and at what rate these energy transformations are carried out but is based on initial and final states of a system undergoing the change. Laws of thermodynamics apply only when a system is in
Upvote An ideal gas is allowed to expand against a constant pressure of 2 bar from 10 L to 50 L in one step. Calculate the amount of work done by the gas. If the same expansion were carried out reversibly, will the work done be higher or lower than the earlier case?
An ideal gas is allowed to expand against a constant pressure of 2 bar from 10 L to 50 L in one step. Calculate the amount of work done by the gas. If the same expansion were carried out reversibly, will the work done be higher or lower than the earlier case?
This is a Short Answer Type Questions as classified in NCERT Exemplar
We know that the amount of work done =-pext? V
On substituting the values in the formula, we get,
-2bar* (50-10)L=-80Lbar
According to the described problem,1 LBar = 100J
Therefore, -80 L bar= (-80*100)= -8000J
= -8kJ, which is the amo
Upvote