Ncert Solutions Chemistry Class 11th
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What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?
(i) 4 mol L–1
(ii) 20 mol L–1
(iii) 0.2 mol L–1
(iv) 2 mol L–1
What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?
(i) 4 mol L–1
(ii) 20 mol L–1
(iii) 0.2 mol L–1
(iv) 2 mol L–1
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (C)
No. of mole given =
On substituting the value in the above equation, the cal, can be calculated as
no, of mole = = 0.1 g
The molarity (M) is given by the formula:
M =
On substituting the values in the above e
Upvote 
Identify the pairs which are not of isotopes?
(i) 12 6 X , 13 6Y
(ii) 35 17X, 37 17 Y
(iii) 146 X, 147Y
(iv) 84 X, 85Y
Identify the pairs which are not of isotopes?
(i) 12 6 X , 13 6Y
(ii) 35 17X, 37 17 Y
(iii) 146 X, 147Y
(iv) 84 X, 85Y
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (iii) & (iv)
The isotopes are defined as atoms with identical atomic numbers but different mass numbers are known as isotopes.
Upvote If travelling at same speeds, which of the following matter waves have the shortest wavelength?
(i) Electron
(ii) Alpha particle (He2+)
(iii) Neutron
(iv) Proton
If travelling at same speeds, which of the following matter waves have the shortest wavelength?
(i) Electron
(ii) Alpha particle (He2+)
(iii) Neutron
(iv) Proton
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (ii) Alpha particle (He2+)
As the wavelength is inversely proportional to the mass of the particles thus the alpha particles would possess the shortest wavelength among the above given option
Upvote A measured temperature on Fahrenheit scale is 200 ° F. What will this reading be on a Celsius scale?
(i) 40 °C
(ii) 94 °C
(iii) 3 °C
(iv) 30 °C
A measured temperature on Fahrenheit scale is 200 ° F. What will this reading be on a Celsius scale?
(i) 40 °C
(ii) 94 °C
(iii) 3 °C
(iv) 30 °C
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (iii)
For the conversion from Fahrenheit to Celsius
On substituting the values in the above equation,
200 =
=93.3 C
Upvote For the electrons of oxygen atom, which of the following statements is correct?
(i) Zeff for an electron in a 2s orbital is the same as Zeff for an electron in a 2p orbital.
(ii) An electron in the 2s orbital has the same energy as an electron in the 2p orbital.
(iii) Zeff for an electron in 1s orbital is the same as Zeff for an electron in a 2s orbital.
(iv) The two electrons present in the 2s orbital have spin quantum numbers ms but of opposite sign.
For the electrons of oxygen atom, which of the following statements is correct?
(i) Zeff for an electron in a 2s orbital is the same as Zeff for an electron in a 2p orbital.
(ii) An electron in the 2s orbital has the same energy as an electron in the 2p orbital.
(iii) Zeff for an electron in 1s orbital is the same as Zeff for an electron in a 2s orbital.
(iv) The two electrons present in the 2s orbital have spin quantum numbers ms but of opposite sign.
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (iv) The two electrons present in the 2s orbital have spin quantum numbers MS but of opposite sign.
According to Pauli’s Exclusion Principle no two electrons should possess the same set of four quantum numbers. Thus the tw
Upvote Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below. Correct reading of mass is 3.0 g. On the basis of given data, mark the correct option out of the following statements.
Student Readings
(i) (ii)
A 3.01 2.99
B 3.05 2.95
(i) Results of both the students are neither accurate nor precise.
(ii) Results of student A are both precise and accurate.
(iii) Results of student B are neither precise nor accurate.
(iv) Results of student B are both precise and accurate.
Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below. Correct reading of mass is 3.0 g. On the basis of given data, mark the correct option out of the following statements.
Student Readings
(i) (ii)
A 3.01 2.99
B 3.05 2.95
(i) Results of both the students are neither accurate nor precise.
(ii) Results of student A are both precise and accurate.
(iii) Results of student B are neither precise nor accurate.
(iv) Results of student B are both precise and accurate.
This is a Multiple Choice Questions as classified in NCERT Exemplar
Option (ii)
Average of readings of student A,
Average of student A =
Average of readings of student B,
Average of student B =
The correct reading is 3. For both A and B, the average value is close to the correct value. Thus, readin
Upvote The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction
2A + 4B → 3C + 4D, when 5 moles of A react with 6 moles of B, then
(i) Which is the limiting reagent?
The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction
2A + 4B → 3C + 4D, when 5 moles of A react with 6 moles of B, then
(i) Which is the limiting reagent?
This is a Short Answer Type Questions as classified in NCERT Exemplar
The reaction is shown below.
2A + 4B? 3C + 4D
According to the above equation, 2 moles of A requires 4 moles of B. So, the number of moles of B required for 5 moles of A is calculated as,
Moles of B = 5 mol of A * = 10 mol
Upvote The pair of ions having same electronic configuration is __________.
(i) Cr3+, Fe3+
(ii) Fe3+, Mn2+
(iii) Fe3+, Co3+
(iv) Sc3+, Cr3+
The pair of ions having same electronic configuration is __________.
(i) Cr3+, Fe3+
(ii) Fe3+, Mn2+
(iii) Fe3+, Co3+
(iv) Sc3+, Cr3+
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (ii)
Fe3+, Mn2+ Fe3+ electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d5 4s2 Mn2+electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d5 4s
Upvote Chlorine exists in two isotopic forms, Cl-37 and Cl-35 but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately
(i) 1:2
(ii) 1:1
(iii) 1:3
(iv) 3:1
Chlorine exists in two isotopic forms, Cl-37 and Cl-35 but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately
(i) 1:2
(ii) 1:1
(iii) 1:3
(iv) 3:1
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (iii) 1:3
The chlorine is a mixture of two isotopes with atomic masses 37U and 35U and its atomic mass is 35.5U. The atomic mass depicts that % composition of Cl-35 is much higher than that of Cl-37 and they are pres
Upvote If 4 g of NaOH dissolves in 36 g of H2O, calculate the mole fraction of each component in the solution. Also, determine the molarity of solution (specific gravity of solution is 1g mL–1).
If 4 g of NaOH dissolves in 36 g of H2O, calculate the mole fraction of each component in the solution. Also, determine the molarity of solution (specific gravity of solution is 1g mL–1).
This is a Short Answer Type Questions as classified in NCERT Exemplar
Molar mass of NaOH = 40 g/ mole
Molar mass of water =18 g / mole
Mass of NaOH= 4 g
Number of moles of 4 g NaOH = = 0.1 mol
Number of moles of H2O= =2 mol
Mole fraction of water
Mole fraction of NaOH = = = 0.95
Number
Upvote