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11th Standard English Medium Chemistry Subject Alkali and Alkaline Earth Metals Book Back 3 Mark Questions with Solution Part - I updated Book back Questions

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Std: 11th Standard - Chemistry

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Questions:

Generic 2

3 x 2 = 6

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

Why sodium hydroxide is much more water soluble than chloride ?

Give the systematic names for the following
Milk of magnesia

Generic 3

1 x 3 = 3

Mention the uses of plaster of paris

Generic 5

1 x 5 = 5

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

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Answers Key:

Generic 2

3 x 2 = 6

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

The solubility product of NaCl is lower than that of NaOH. The more soluble a substance is, the higher the K_sp value it has In aqueous solution NaOH gives OH^-ions. It can be solvated by establishing H-bonds with water molecules. So it is more water soluble.

Mg (OH)₂ ; Magnesium hydroxide.

Generic 3

1 x 3 = 3

The largest use of plaster of paris is in the building industry as well as plasters. It is used for immobilising the affected part of organ where there is a bone fracture or sprain. It is also employed in dentistry, in ornamental work and for making casts of statues and busts.

Generic 5

1 x 5 = 5

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.