Class 11th
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8 months agoContributor-Level 10
9.34. KCl is a salt of strong acid HCl and strong base KOH. Such salts are neutral in nature and do not undergo hydrolysis. In neutral water, acidic water, and alkaline water, KCl dissociates as
Water
KCl → ?K++Cl−
AlCl3? is a salt of strong acid HCl and weak base Al(OH)3?.
(i) In normal water, it is hydrolyzed.
AlCl3?+3H2?O→Al(OH)3?+3H++3Cl−
(ii) In acidic water, H+ ions react with Al(OH)3? (obtained from the hydrolysis of AlCl3?) forming water and Al3+ ions. Hence it exists as Al3++Cl−
AlCl3? + acidifiedwater? → Al++3Cl−
(iii) In alkaline wa
New answer posted
8 months agoContributor-Level 10
9.33. Atomic number 15 is of phosphorus. The hydride is PH3 and its nature is covalent. Atomic number = 19 is of potassium. The hydride is KH and it is ionic in nature. Atomic number = 23 is of vanadium. The hydride is VH. It is interstitial or metallic. Atomic number =44 is of ruthenium, its hydride is interstitial or metallic.
New answer posted
8 months agoContributor-Level 10
9.32. Saline hydrides (i.e. CaH2 NaH etc.) react with water and form the corresponding metal hydroxide with the liberation of H2 gas. Thus, these hydrides can be used to remove traces of water from the organic compounds.
NaH (s) + H2O (l) → NaOH (aq) + H2 (g)
CaH2 (s) + 2H2O (l) → Ca (OH)2 (aq) + H2 (g)
New answer posted
8 months agoContributor-Level 10
9.31. (H+ and OH− ions) of water molecule react with a compound to form products. For example:
NaH+H2O → NaOH+H2
Hydration is defined as the addition of one or more water molecules to ions or molecules to form hydrated compounds. For example:
CuSO4+5H2O → CuSO4.5H2O
New answer posted
8 months agoNew answer posted
8 months agoContributor-Level 10
9.29. Water is highly polar in nature. That is why it has high dielectric constant and high dipole moment. Because of these properties, water is a universal solvent.
Water is good solvent for ionic compounds but poor solvent for covalent compounds. It can hydrolyse ionic compounds.
New answer posted
8 months agoContributor-Level 10
9.28. (i) Major part of all living system is made of water.
(ii) It constitutes about 65 – 70% of body weights of animals and plants.
(iii) Some properties of water like high specific heat, thermal conductivity, surface tension, high polarity allow water to play a major role in biosphere.
(iv) Because of high heat of vaporisation it is responsible to regulate temperature of living beings.
(v) It is an excellent fluid for the transportation of minerals and nutrients in plants.
(vi) It is also required for photosynthesis in plants.
New answer posted
8 months agoContributor-Level 10
9.27. No, demineralised or distilled water is not fit for drinking purposes. It can be made useful by adding required amount of ions which are useful for our body.
New answer posted
8 months agoContributor-Level 10
9.26. Water free from salts and minerals is called Demineralized water. Ion exchange method is used for this process. The ions present in the water bind to the positively or negatively charged sites on a resin when water is passed through the column packed with resin.
New answer posted
8 months agoContributor-Level 10
9.25. H2O2 as an oxidising agent:
2Fe2+ (aq) + 2H+ (aq) +H2O2 (aq) → 2Fe3+ (aq) + 2 H2O (l)
H2O2 as a reducing agent:
I2 (s) + H2O2 (aq) + 2OH– (aq) → 2I– (aq) + 2 H2O (l) + O2 (g)
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