Ncert Solutions Chemistry Class 11th

The correct set from the following in which both pairs are in correct order of melting point is:

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere.

Reason R : Hydrogen is the lightest element

In the light of the above statements, choose the correct answer from the options given below:

Match List – I and List – II

Choose the correct answer from the options given below:

The number of compound/s given below which contain/s – COOH group is………….

(Integer answer)

(a) Sulphanilic acid                                                        (b) Picric acid

(c) Aspirin                                                                       (d) Ascorbic acid

The correct statement about B₂H₆ is:

Consider titration of NoOH solution versus 1.25M oxalic acid solution. At the end point following burette readings were obtained.

(i) 4.5mL                                                                          (ii) 4.5mL

(iii) 4.44mL                                                                      (iv) 4.4mL

(v) 4.44mL

If the volume of oxalic acid taken was 10.0mL then the molarity of the NaOH solution is……….M.

(Rounded-off to the nearest integer).

Five moles of an ideal gas at 293K is expanded isothermally from an initial pressure of 2.1 MPa to 1.3 MPa against at constant external pressure 4.3 MPa. The heat transferred in this process is……. kJ mol^-1. (Rounded-off to the nearest integer).

[Use R = 8.314 J mol^-1 K^-1]

Copper reduces $N{O}_3^{-}$ into NO and NO₂ depending upon the concentration of HNO₃ in solution. (Assuming fixed $\left[C{u}^{2+}\right]and{P}_{NO}=P_{N{O}_2}$ ), the HNO₃ concentration at which the thermodynamic tendency for reduction of $N{O}_3^{-}into$ NO and NO₂by copper is same is 10^x M. The value of 2x is……. (rounded-off to the nearest integer).

$[Given,E_{C{u}^{2+}/Cu}^0=0.34V,E_{N{O}_3^{-}/NO}^0=0.96V,E_{N{O}_3^{-}/N{O}_2}^0=0.79Vandat298K,\frac{RT}{F}\left(2.303\right)=0.059]$

Given below are two statements:

Statement I : The pH of rain water is normally $\sim 5.6$

Statement II : If the pH of rain water drops below 5.6, it is called acid rain.

In the light of the above statements, choose the correct answer from the options given below

Given below are two statements:                                        

Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog.

Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog.

In the light of the above statements, choose the correct answer from the options given below: