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11th Standard English Medium Chemistry Subject Alkali and Alkaline Earth Metals Creative 2 Mark Questions with Solution Part - I

Published on: 25/06/2021

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Std: 11th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

Mention the uses of sodium.

Mention the uses of lithium.

Lithium iodide is covalent. Explain why?

Explain why alkali metals are very reactive.

Alkali metals give a characteristics colour for a bunsen flame. Explain why?

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Answers Key:

Generic 2

5 x 2 = 10

(i) Sodium is used to make Na/Pb alloy needed to make Pb(Et)₄ and Pb(Me)₄
(ii) Liquid sodium metal usde as a coolant in fast breeder nuclear reactors.

(i) Lithium metal is used to make alloys.
(ii) Lithium is also used to make electrochemical cells.
(iii) Lithium carbonate is used in medicines.

Lithium iodide shows covalent character, as Li⁺ ion, being smaller exerts high polarising power on the iodide anion. Alternatively, the iodide ion being the largest can be polarised to a greater extent by Li⁺ ion. Hence, lithium iodide is covalent.

The reactivity of alkali metals is due to their low ionisation enthalpy. the lonisation enthalpy decreases down the group. Hence the reactivity of alkali metal increases from Li to Cs.
The high reactivity of alkali metals is proved by their reaction with oxygen add halogen which are most electro negative.

The heat in the flame excites the valence electron to a higher energy-level. When it drops back to its actual energy level, the excess energy is emitted as light, whose wavelength is in the visible region. This appears as a characteristic colour to the particular metal.