Ncert Solutions Chemistry Class 11th
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Define a black body. Does a complete black body exist practically?
Define a black body. Does a complete black body exist practically?
An ideal body, which emits and absorbs radiations of all frequencies uniformly, is called a black body and the radiation emitted by such a body is called black body radiation. In practice, no such body exists. Carbon black approximates fairly closely to black body. A good physical approximation to a
Upvote 
State Heisenberg’s Uncertainty Principle and the significance of it.
State Heisenberg’s Uncertainty Principle and the significance of it.
Werner Heisenberg a German physicist in 1927, stated uncertainty principle which is the consequence of dual behaviour of matter and. It states that it is impossible to determine simultaneously, the exact position and exact momentum (or velocity) of an electron.
It rules out existence of definite path
Upvote The increasing order of reduction of alkyl halides with zinc and dilute HCl is
(i) R–Cl< R–I < R–Br
(ii) R–Cl< R–Br < R–I
(iii) R–I < R–Br < R–Cl
(iv) R–Br< R–I < R–Cl
The increasing order of reduction of alkyl halides with zinc and dilute HCl is
(i) R–Cl< R–I < R–Br
(ii) R–Cl< R–Br < R–I
(iii) R–I < R–Br < R–Cl
(iv) R–Br< R–I < R–Cl
This is a multiple choice answer as classified in NCERT Exemplar
(ii) R–Cl< R–Br < R–I
The reduction of alkyl halides depends upon the C-X bond strength i.e. lesser the bond strength higher will be the reactivity of alkyl halide. As down the group size of the halogens increases thus the bond strength decreases.
Upvote Question Answer:
Why all isotopes of a given element show the same type of chemical behaviour?
Question Answer:
Why all isotopes of a given element show the same type of chemical behaviour?
The chemical properties of an atom are controlled by the number of electrons in the atom, which remains the same despite the change or variation in atomic masses in case the of isotopes.
Upvote The maximum number of electrons in a sub-shell is given by the equation
(a) n2 (b) 2n2 (c) 2l – 1 (d) 2l + 1
The maximum number of electrons in a sub-shell is given by the equation
(a) n2 (b) 2n2 (c) 2l – 1 (d) 2l + 1
Kindly go through the solution
(d) 2l + 1
Upvote Arrange the halogens F2, Cl2, Br2, I2, in order of their increasing reactivity with alkanes.
(i) I2< Br2< Cl2< F2
(ii) Br2< Cl2< F2< I2
(iii) F2< Cl2< Br2< I2
(iv) Br2< I2 < Cl2< F2
Arrange the halogens F2, Cl2, Br2, I2, in order of their increasing reactivity with alkanes.
(i) I2< Br2< Cl2< F2
(ii) Br2< Cl2< F2< I2
(iii) F2< Cl2< Br2< I2
(iv) Br2< I2 < Cl2< F2
This is a multiple choice answer as classified in NCERT Exemplar
(i) I2< Br2< Cl2< F2
The reactivity of halogens with alkanes depends on the electronegativity i.e. higher the electronegativity higher would be the reaction. As down the group reactivity decrease so thus its reactivity.
Upvote The energy needed to remove a single electron (most loosely bound) from an isolated – gaseous atom is called
(a) Ionisation energy (b) Electronegativity
(c) Kinetic energy (d) Electron affinity
The energy needed to remove a single electron (most loosely bound) from an isolated – gaseous atom is called
(a) Ionisation energy (b) Electronegativity
(c) Kinetic energy (d) Electron affinity
Kindly go through the solution
(a) ionisation energy
Upvote What is value of Planck’s constant in S.I. units?
(a) 6.62 x 1024 Js (b) 6.62 x 1034 Js (c) 6.62 x 10-24 Js (d) 6.62 x 10-34 Js
What is value of Planck’s constant in S.I. units?
(a) 6.62 x 1024 Js (b) 6.62 x 1034 Js (c) 6.62 x 10-24 Js (d) 6.62 x 10-34 Js
Kindly go through the solution
(d) 6.62 x 10-34 Js
Upvote Arrange the following in decreasing order of their boiling points.
(A) n–butane
(B) 2–methylbutane
(C) n-pentane
(D) 2,2–dimethylpropane
(i) A > B > C > D
(ii) B > C > D > A
(iii) D > C > B > A
(iv) C > B > D > A
Arrange the following in decreasing order of their boiling points.
(A) n–butane
(B) 2–methylbutane
(C) n-pentane
(D) 2,2–dimethylpropane
(i) A > B > C > D
(ii) B > C > D > A
(iii) D > C > B > A
(iv) C > B > D > A
This is a multiple choice answer as classified in NCERT Exemplar
(iv) C > B > D > A
The boiling point increases with the increase in the length of the side chain. However, with the branching, the boiling point decreases due to the decrease in the surface area.
Upvote Which element does not have any neutron?
(a) Li (b) C (c) H (d) B
Which element does not have any neutron?
(a) Li (b) C (c) H (d) B
Kindly go through the solution
(c) H
Upvote