Ncert Solutions Chemistry Class 11th

Find the enthalpy of combustion of propane gas from the following data. Bond energy (kJ/mol)
BE_C-H = a₁
BE_O=O = a₂
BE_C=O = a₃
BE_O-H = a₄
BE_C-C = a₅

A fish swimming in water body when taken out from the water body is covered with a film of water of weight 36g. When it is subjected to cooking at 100°C, then the internal energy for vaporization in kJ mol1 is_____________. (nearest integer)

[Assume steam to be an ideal gas. Given ${\Delta }_{vap}{H}^{\Theta }$ ${}_{}{}^{}$ for water at 373K and 1 bar is 41.1 kJ mol1; R = 8.31 JK1mol1]

The term - TΔS_total at constant temperature and pressure is known as

The values of van der Waal's constants 'a' and 'b' for three different gases are given below

The correct order of liquefaction of gases is

Choose the correct answer from the options given below:

1 mole of K₂Cr₂O₇ cannot oxidise

Identify the product in the following reaction:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Helium is used to dilute oxygen in diving apparatus.
Reason R: Helium has high solubility in O₂.

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

In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe³⁺ due to the formation of

Match List-I with List-II
List-I: A. Coke, B. Diamond, C. Fullerene, D. Graphite
List-II: I. Carbon atoms are sp³ hybridised, II. Used as a dry lubricant, III. Used as a reducing agent, IV. Cage like molecules

Choose the correct answer from the options given below: