The S Block Elements
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New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (i) and (ii)
Among the alkali metals, lithium has an exceptionally small size. Due to the small size of lithium and high nuclear charge it has high palajising power.
New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (i) and (ii)
Beryllium resembles aluminum through the diagonal relation. Beryllium forms a protective film of oxide on the surface, and thus, is prevented by the attack of acids.
Thus, statement (1) is correct.
On moving down the group, as the size increases the hydration enthalpy decreases. The hydration enthalpy of beryllium ions are high due to the small size. Thus, sulfates are readily soluble in water. Thus, statement (2) is correct.
Beryllium does not exhibit coordination numbers more than four. As it has no d orbitals.
Thus, statement (3) is not cor
New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (i) and (iii)
The chlorides of alklaje earth metals are hydrated. On moving down the group, the extent of hydration decreases. Therefore, the correct formula of halides are: CaCl2?6H2O and BaCl2?2H2O.
New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (ii) and (iii)
Zeolite is sodium aluminum silicate. It is used to reduce the hardness of water. It has a property to exchange Mg2+ ions and Ca2+ ions from hard water by the Na+ions of zeolite.
New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (i) and (ii)
On moving down the group, as the size increases the hydration enthalpy decreases. The hydration enthalpy of beryllium and magnesium ions are high due to the small size. Thus, sulfates are readily soluble in water.
New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (i) and (iii)
Na2CO3 is used in paper paints and textile industry. It is used to manufacture soap powders.
NaOH is used in textile industry for mercerising cotton fabrics.
New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (ii) and (iv)
Alkali metals have larger atomic size and low density. These metals lose electrons due to less effective nuclear charge. They have a high value of electrode potential.
Lithium has the highest negative reduction potential value. Due to the small size of lithium it has a small atomic size and the highest ionization enthalpy.
New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (iv)
Chlorides of alkaline earth metals are hydrated salts. They can be used as dehydrating agents due to their hygroscopic nature to absorb moisture from air. Extent of hydration decreases from Mg to Ba.
Therefore, dehydration of hydrates of halides of calcium, barium and strontium i.e., CaCl2.6H2O, BaCl2.2H2O, SrCl2.2H2O can be achieved by heating.
New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct Option (iii)
The chemical formula of A is Ca (OH)2 Sodium carbonate is prepared by Solvay's process. In this process, ammonia is recovered when ammonium chloride reacts with calcium hydroxide. On reacting NH4Cl with Ca (OH)2, calcium chloride is obtained as a by-product. The reaction is given below.
2NH4Cl+Ca (OH)2→2NH3+CaCl2+H2O
When CO2 is bubbled through an aqueous solution of Ca (OH)2 the solution turns milky. It is used in whitewashing due to its disinfectant nature.
New answer posted
4 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (i)
Calcium hydroxide is used in the preparation of bleaching powder. It reacts with chlorine to form hypochlorite, a constituent of bleaching powder.
Ca (OH)2+Cl2→CaCl2+H2O+Ca (OCl)2
It is a white amorphous powder and is sparingly soluble in water.
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