11th Standard Chemistry - Alkali and Alkaline Earth Metals Book Back Questions | QB365

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11th Standard Chemistry - Alkali and Alkaline Earth Metals Book Back Questions

Published on: 03/09/2019

Alkali and Alkaline Earth Metals

Download Tamil Nadu 11th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 11th Standard - Chemistry

chapter: - Model Question paper

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Questions:

Multiple Choice Question

5 x 1 = 5

The product obtained as a result of a reaction of nitrogen with CaC₂ is ___________

(a)

Ca(CN)₃

(b)

CaN₂

(c)

CaCN₂

(d)

Ca₃N₂

In which process, fused sodium hydroxide is electrolysed for extraction of sodium ?

(a)

Castner's process

(b)

Cyanide process

(c)

Down process

(d)

All of these

Lithium shows diagonal relationship with _____________

(a)

sodium

(b)

magnesium

(c)

calcium

(d)

aluminium

RbO₂ is _____________

(a)

superoxide and paramagnetic

(b)

peroxide and diamagnetic

(c)

superoxide and diamagnetic

(d)

peroxide and paramagnetic

For alkali metals, which one of the following trends is incorrect ?

(a)

Hydration energy: Li > Na > K > Rb

(b)

Ionisation energy: Li > Na > K > Rb

(c)

Density: Li < Na < K < Rb

(d)

Atomic size: Li < Na < K < Rb

Generic 2

2 x 2 = 4

Write the chemical equations for the reactions involved in solvay process of preparation of sodium carbonate.

Explain what is meant by efflorescence.

Generic 3

4 x 3 = 12

Why alkaline earth metals are harder than alkali metals.

Give the uses of gypsum.

10.

Beryllium halides are Covalent whereas magnesium halides are ionic why ?

11.

Write balanced chemical equation for each of the following chemical reactions.
Lithium metal with nitrogen gas.

Generic 5

2 x 5 = 10

12.

Discuss the similarities between beryllium and aluminium.

13.

Which would you expect to have a higher melting point magnesium oxide or magnesium fluoride ? Explain your reasoning.

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Answers Key:

Multiple Choice Question

5 x 1 = 5

(a)
Castner's process

(b)
magnesium

(a)
superoxide and paramagnetic

Generic 2

2 x 2 = 4

2NH₃ + H₂O + CO₂ ⟶ (NH₄)₂ CO₃
(NH₄)₂ CO₃ + H₂O + CO₂ ⟶ 2NH₄HCO₃
2NH₄HCO₃ + NaCl ⟶ NH₄Cl + NaHCO₃
2NaH CO₃ ⟶ Na₂CO₃ + CO₂ + H₂O.

Efflorescence is the spontaneous loss of water by a hydrated salt, which occurs when the aqueous vapor pressure of the hydrate is greater than the partial pressure of the water vapour in the air. This is the property of salts
Ex: Glauber's salt- Na₂SO₄·10H₂O
Epsom salt - MgSO₄·7H₂O

Generic 3

4 x 3 = 12

Alkali metals have one e^o in their outer most shell. Alkaline earth metals have 2 e^o in their outer most shell. More valence electrons and more positively charged nucleii leads to greater opportunity for metallic bonding.

1. Gypsum is used in making drywalls or plaster boards.
2. Another important use of gypsum is the production of plaster of Paris. Gypsum is heated to about 300 degree Fahrenheit to produce plaster of paris, which is also known as gypsum plaster. It is mainly used as a sculpting material.
3. Gypsum is used in making surgical and orthopedic casts, such as surgical splints and casting moulds.
4. Gypsum plays an important role in agriculture as a soil additive, conditioner, and fertilizer. It helps loosen up compact or clay soil, and provides calcium and sulphur, which are essential for the healthy growth of a plant.
5. Gypsum is used in toothpastes, shampoos, and hair products.
6. Gypsum is a component of portland cement, where it acts as a hardening retarder to control the speed at which concrete sets.

10.

This is due to the smaller size and relatively high charge as Be²⁺ ion. Moreover Beryllium is a non - metal. But Magnesium is a metal. In the case of beryllium the ionisation energy and electronegativity of the halides are almost similar; but there is a vast difference in IE and electronegativity between Mg and halides.

11.

6Li+ N₂ ⟶ 2Li₃N

Generic 5

2 x 5 = 10

12.

S.No	Properties
1	Beryllium chloride forms a dimeric structure like aluminium chloride with chloride bridges. Beryllitrm chloride also forms polymeric chain structure ln addition to dinner. Both are soluble in organic solvents and are strong lewis acids.
2	Beryllium hydroxide dissolves in excess of alkali and gives beryllate ion [Be(OH)₂]²^- as aluminium hydroxide which gives aluminate ion, [Al(OH)₄]^-
3	Beryllium arid aluminum ions have strong tendency to form complexes,
4	Both beryllium and aluminium hydroxides are amphoteric in nature.
5	Carbides of beryllium (Be₂C) like aluminum carbide (Al₄C₃) give methane on hydrolysis
6	Both beryllium and aluminium are rendered passive by nitric acid

13.

Magnesium oxide in having higher melting point. The lattice energy of MgO & MgF₂ are 3938 and 2957 respectively.
MgO has +2, -2 charges, MgF₂ has +2, -1 charges. When the two charges are multiplied together, MgO results in larger amount of lattice energy since it has a higher charge, The strong attraction cause most ionic material to be hard and brittle and have high melting points.