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12th Standard English Medium Chemistry Subject p - Block Elements - II Creative 2 Mark Questions with Solution Part - I

Published on: 21/06/2021

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Std: 12th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

There is a huge difference between the melting and boiling points of oxygen and sulphur. Why?

(i) Give correct order of boiling point of hydride of group 17.
(ii) Fluorine exhibits only -1 oxidation state whereas other halogens show +1, +3, +5 and +7 oxidation state also Explain.

Elements of group 16 show lower value of first ionization enthalpy compared to group 15, why?

What is the reaction of Phosphorous with alkali?

Give two uses of nitric acid.

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Answers Key:

Generic 2

5 x 2 = 10

(i) Sulphur has great catenation property and forms large molecule having high weight, which results higher melting point.
(ii) While oxygen exists as diatomic molecule of less molecular weight, hence has very low melting point.

(i) HCl < HBr < HI < HF
(ii) Fluorine being the most electronegative element cannot have positive oxidation state. Other halogens have d-orbitals, therefore can expand their octet.

Element of group 15 have stable half-filled p-orbitals hence large amount of energy is required to remove electrons as compared to group 16, which has an incomplete p subshell.

Yellow phosphorus reacts with alkali on boiling in an inert atmosphere liberating phosphine. Phosphorus acts as a reducing agent.
\({ P }_{ 4 }+NaOH+{ H }_{ 2 }O\longrightarrow \underset { Sodiumhypophosphite }{ { 3NaH }_{ 2 }{ PO }_{ 2 } } +\underset { Phosphine }{ { PH }_{ 3 } } \uparrow \)

(i) Nitric acid is used as a oxidising agent and in the preparation of aqua regia.
(ii) Salts of nitric acid are used in photography (AgNO₃) and gun powder for fire arms (NaNO₃)·