Ncert Solutions Chemistry Class 11th
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Which of the following properties of atom could be explained correctly by Thomson Model of atom?
(i) Overall neutrality of atom.
(ii) Spectra of hydrogen atom.
(iii) Position of electrons, protons and neutrons in atom.
(iv) Stability of atom.
Which of the following properties of atom could be explained correctly by Thomson Model of atom?
(i) Overall neutrality of atom.
(ii) Spectra of hydrogen atom.
(iii) Position of electrons, protons and neutrons in atom.
(iv) Stability of atom.
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (i)
Overall neutrality of atom.
According to the J.J Thomson model the positive charge is uniformly distributed and the electrons are embedded into it in such a manner as to give the most stable electrostatic arrange
Upvote 
If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio.
If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio.
This is a Short Answer Type Questions as classified in NCERT Exemplar
(a) Is this statement true?
Ans: Yes the given statement is true
(b) If yes, according to which law?
Ans: Multiple law of proportions: According to the Law of Multiple proportions, when two elements combine to generate
Upvote Which of the following statements about the electron is incorrect?
(i) It is a negatively charged particle.
(ii) The mass of electron is equal to the mass of neutron.
(iii) It is a basic constituent of all atoms.
(iv) It is a constituent of cathode rays.
Which of the following statements about the electron is incorrect?
(i) It is a negatively charged particle.
(ii) The mass of electron is equal to the mass of neutron.
(iii) It is a basic constituent of all atoms.
(iv) It is a constituent of cathode rays.
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (ii)
The mass of an electron is equal to the mass of a neutron.
The neutron is heavier than the electron as
Mass of the neutron = 1.67 x 10-27 kg
Mass of the electron = 9.11 x 10-31kg
Upvote 45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below:
2N2(g) + O2(g) → 2N2O(g)
Which law is being obeyed in this experiment? Write the statement of the law?
45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below:
2N2(g) + O2(g) → 2N2O(g)
Which law is being obeyed in this experiment? Write the statement of the law?
This is a Short Answer Type Questions as classified in NCERT Exemplar
If all gases are at the same temperature and pressure, Gay lussac's law of gaseous volumes states that gases combine or are created in a chemical reaction in a simple volume ratio.
H2 (g) +
Upvote Which of the following statement is not correct about the characteristics of cathode rays?
(i) They start from the cathode and move towards the anode.
(ii) They travel in straight line in the absence of an external electrical or magnetic field.
(iii) Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.
(iv) Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube.
Which of the following statement is not correct about the characteristics of cathode rays?
(i) They start from the cathode and move towards the anode.
(ii) They travel in straight line in the absence of an external electrical or magnetic field.
(iii) Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.
(iv) Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube.
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (iv)
Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube. As per the result obtained from the cathode ray discharge tube experiment the characteristics of cathode rays (electrons)
Upvote The probability density plots of 1s and 2s orbitals are given in Fig. 2.1:
The density of dots in a region represents the probability density of finding electrons in the region.
On the basis of above diagram which of the following statements is incorrect?
(i) 1s and 2s orbitals are spherical in shape.
(ii) The probability of finding the electron is maximum near the nucleus.
(iii) The probability of finding the electron at a given distance is equal in all directions.
(iv) The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus increases.
The probability density plots of 1s and 2s orbitals are given in Fig. 2.1:
The density of dots in a region represents the probability density of finding electrons in the region.
On the basis of above diagram which of the following statements is incorrect?
(i) 1s and 2s orbitals are spherical in shape.
(ii) The probability of finding the electron is maximum near the nucleus.
(iii) The probability of finding the electron at a given distance is equal in all directions.
(iv) The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus increases.
This is a Multiple Choice Questions as classified in NCERT Exemplar
ANS – Option (iv)
The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus increases. Electrons at the 1s orbital decreases as we move far from the nucleus, however in case of 2s the probabi
Upvote Calculate the mass percent of calcium, phosphorus and oxygen in calcium phosphate Ca3(PO4)2.
Calculate the mass percent of calcium, phosphorus and oxygen in calcium phosphate Ca3(PO4)2.
This is a Short Answer Type Questions as classified in NCERT Exemplar
Molecular mass of Ca3 (PO4)2 = 310.18 g / mole
Given mass of calcium 4 x 30= 120 g
Given mass of phosphorous = 31 x 2 =62 g
Given mass of oxygen = 16 x 8 = 128 g
Mass percent of Calcium = x 100 = 38.71%
Mass percent o
Upvote Which of the following options does not represent ground state electronic configuration of an atom?
(i) 1s2 2s2 2p6 3s2 3p6 3d8 4s2
(ii) 1s2 2s2 2p6 3s2 3p6 3d9 4s2
(iii) 1s2 2s2 2p6 3s2 3p6 3d10 4s1
(iv) 1s2 2s2 2p6 3s2 3p6 3d5 4s1
Which of the following options does not represent ground state electronic configuration of an atom?
(i) 1s2 2s2 2p6 3s2 3p6 3d8 4s2
(ii) 1s2 2s2 2p6 3s2 3p6 3d9 4s2
(iii) 1s2 2s2 2p6 3s2 3p6 3d10 4s1
(iv) 1s2 2s2 2p6 3s2 3p6 3d5 4s1
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: (ii) 1s2 2s2 2p6 3s2 3p6 3d9 4s2
As per the Hund's rule the half-filled and fully filled orbital leads to the extra stability due to the symmetry thus fully filled 3d and half-filled 4s is preferred.
Upvote What is the difference between molality and molarity?
What is the difference between molality and molarity?
This is a Short Answer Type Questions as classified in NCERT Exemplar
The number of moles of a substance (known as the solute) dissolved in precisely 1 litce of a solution is known as molarity (solvent and solute combined). As a result, the formula for estimating molarity is as follows:
Molarity =
Upvote Which of the following conclusions could not be derived from Rutherford’s α -particle scattering experiement?
(i) Most of the space in the atom is empty.
(ii) The radius of the atom is about 10–10 m while that of nucleus is 10–15 m.
(iii) Electrons move in a circular path of fixed energy called orbits.
(iv) Electrons and the nucleus are held together by electrostatic forces of attraction
Which of the following conclusions could not be derived from Rutherford’s α -particle scattering experiement?
(i) Most of the space in the atom is empty.
(ii) The radius of the atom is about 10–10 m while that of nucleus is 10–15 m.
(iii) Electrons move in a circular path of fixed energy called orbits.
(iv) Electrons and the nucleus are held together by electrostatic forces of attraction
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (iii)
Electrons move in a circular path of fixed energy called orbits .
As per Rutherford’s α-particle scattering experiment the nucleus is surrounded by electrons that move around the nucleus with a very high-speed
Upvote