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6 months ago

Class 11th Ncert Solutions Chemistry Class 11th

4.30. Which hybrid orbitals are used by carbon atoms in the following molecules?

(a) CH₃-CH₃ (b) CH₃-CH=CH₂ (c) CH₃-CH₂-OH (d) CH₃-CHO (e) CH₃COOH.

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Payal Gupta

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4.30. Kindly go through the solution

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Class 11th Ncert Solutions Chemistry Class 11th

4.27. Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in C₂H₄ and C₂H₂molecules.

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Payal Gupta

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Kindly go through the solution

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Class 11th Ncert Solutions Chemistry Class 11th

4.20 The skeletal structure of CH₃COOH as shown below is correct, but some of the bonds are shown incorrectly. Write the correct Lewis structure for acetic acid.

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Payal Gupta

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4.20 Kindly go through the solution

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Class 11th Ncert Solutions Chemistry Class 11th

4.14. Use Lewis symbols to show electron transfer between the following atoms to form cations and anions (a) K and S (b) Ca and O (c) Al and N.

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Payal Gupta

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4.14. Kindly go through the solution

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Class 11th Ncert Solutions Chemistry Class 11th

4.13. Write the resonance structures for SO₃, NO₂ and NO_3.

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Payal Gupta

Contributor-Level 10

4.13. Kindly go through the solution

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Class 11th Ncert Solutions Chemistry Class 11th

3.41. Assertion: The size of an anion will be larger than that of the parent atom.

Reason: The addition of one or more electrons would result in increased repulsion among the electrons and a decrease in effective nuclear charge

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Class 11th Ncert Solutions Chemistry Class 11th

3.31. The first (ΔiH₁) and the second (ΔiH₂) ionization enthalpies (in kJ mol^–1) and the (Δ_egH) electron gain enthalpy (in kJ mol^–1) of a few elements are given below:

Elements ΔH1 ΔH2 Δ_egH

I 520 7300 –60

II 419

...more

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Payal Gupta

Contributor-Level 10

(a) The element V has the highest first ionization enthalpy (? _iH₁) and positive electron gain enthalpy (? _egH) and hence it is the least reactive element. Since inert gases have positive? _egH, therefore, the element-V must be an inert gas. The values of? _iH₁, ? _iH₂ and? _egH match that of He.

(b) The element II which has the least first ionization enthalpy (? _iH₁) and a low negative electron gain enthalpy (? _egH) is the most reactive metal. The values of ? _iH₁, ? _iH₂ and? _egH match that of K (potassium).

(c) The element III which has high fi

...more

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6 months ago

Class 11th Physics NCERT Exemplar Solutions Class 11th Chapter Fifteen

Which of the following statements are true for a stationary wave?

(a) Every particle has a fixed amplitude which is different from the amplitude of its nearest particle.

(b) All the particles cross their mean position at the same time.

(c) All the particles are oscillating with same amplitude.

(d) There is no net transfer of energy across any plane.

(e) There are some particles which are always at rest.

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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(a, b, d, e) a) clearly every particle at x will have amplitude =asinkx=fixed

b) for mean position =0

coswt=0

wt= (2n-1) $\frac{π}{2}$

hence for a fixed of n all particles are having same value of time t= (2n-1) $\frac{π}{2 w}$

c) amplitude of all the particles are asinkx which is different for different particles at different values of x

d) the energy is a stationary wave is confined between two nodes.

e) particles at different nodes are always at rest.

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6 months ago

Class 11th Physics NCERT Exemplar Solutions Class 11th Chapter Fifteen

A train, standing in a station yard, blows a whistle of frequency 400 Hz in still air. The wind starts blowing in the direction from the yard to the station with a speed of 10m/s. Given that the speed of sound in still air is 340m/s,

(a) The frequency of sound as heard by an observer standing on the platform is 400Hz.

(b) The speed of sound for the observer standing on the platform is 350m/s.

(c) The frequency of sound as heard by the observer standing on the platform will increase.

(d) The frequency of sound as heard by the observer standing on the platform will decrease.

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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(a, b) v_o=400Hz, v=340m/s

V_m=10m/s

(a) as both source and observer are stationary, hence frequency observed will be same as natural frequency v_o=400Hz

(b) the speed of sound v=v+v_w= 340+10=350m/s

(c) there will be on effect on frequency because there is no relative motion between source and observer hence c, d are incorrect.

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6 months ago

Class 11th Physics NCERT Exemplar Solutions Class 11th Chapter Fifteen

The transverse displacement of a string (clamped at its both ends) is given by y (x,t) = 0.06 sin (2πx/3) cos (120πt). All the points on the string between two consecutive nodes vibrate with

(a) Same frequency

(b) Same phase

(c) Same energy

(d) Different amplitude.

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Payal Gupta

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

(a, b, d) As we know by y (x, t) = 0.06 sin (2πx/3) cos (120πt)

By comparing the equation with general equation N denotes nodes and A denotes antinodes.

(a) Clearly frequency is common for all the points

(b) Consider all the particles between two nodes they are having same phase at given time

(c) But are having different amplitude of 0.06sin (2 $\frac{π}{3} x$ ) and because of different amplitudes they are having different energies.

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