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71.

What type of substances do not respond positively to the Kjeldahl’s method for the estimation of nitrogen?

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72.

What is collected by the downward displacement of KOH solution in Schiff's nitrometer?

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73.

What is taken in nitrometer where N₂ gas is collected in Duma's method and why?

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74.

When does Carius method fail while estimating halogens?

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75.

How will you explain the tetracovalency of carbon?

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76.

State and explain hybridisation.

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77.

What are the necessary conditions for hybridization?

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78.

Discuss the different types of hybridisation in s and p atomic orbitals

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79.

Discuss the shape of methane molecule.

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80.

Discuss the shape of ethane molecule.

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