Chemistry
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New answer posted
10 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
10 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
10 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
10 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
10 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.
New answer posted
10 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (ii)
Alkali and alkaline metals impart characteristic color. Calcium gives brick red color, Strontium gives crimson red color, Barium gives apple green color, and radium gives crimson color. So, the compound is calcium nitrate. On heating calcium nitrate, it gives calcium oxide, nitrogen and nitrogen dioxide gas which is brown in color.
Ca (NO3)2→CaO+O2+NO2↑
New answer posted
10 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (iv)
Anhydrous sodium carbonate is known as soda ash. The formula of soda ash is Na2CO3? It is also known as washing soda.
New answer posted
10 months agoContributor-Level 10
This is a Long Answers Type Questions as classified in NCERT Exemplar
Grp-13 The atomic size of the boron family follows the irregular trend. Generally, down the group the size increases but Gallium has a smaller atomic radius than Aluminium due to the poor shielding effect of 3d-orbitals.
Order: B
Grp-14 The size of the carbon family is smaller than the modern family and as we move down the group the atomic size increases regularly. The increase in covalent radius from carbon to silicon is prominent while from Silicon to lead a small increase in covalent radius is observed; this is due to the presence of completely filled D and f-orbita
New answer posted
10 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct option (i)
Beryllium being least reactive does not form hydride by direct heating with dihydrogen. Also due to its small size and high ionization enthalpy it cannot form hydrides by direct heating.
New answer posted
10 months agoContributor-Level 10
This is a multiple choice type question as classified in NCERT Exemplar
Correct Option (iii)
Ca (OH)2 saked lime is only sparingly soluble in water. When CaO is soaked in water, it produces a white suspension, and the reaction is highly exothermic. White suspension is called milk of lime and it is used for white washing.
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