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
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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
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Choose the correct answer from the options given below:

1 mole of K₂Cr₂O₇ cannot oxidise
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Identify the product in the following reaction:
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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
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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:
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