If water contains dissolved calcium hydrogen carbonate, out of soaps and synthetic

(b) calcium and phosphorus

(a) Magnesium chloride →MgCl2  (b) Calcium oxide →CaO  (c) Copper nitrate →Cu(NO3)2  (d) Aluminium chloride →AlCl3  (e) Calcium carbonate →CaCO3

1 mole of calcium chloride = 111g  ∴ 222g of CaCl2 is equivalent to 2 moles of CaCl2  Since 1 formula unit CaCl2 gives 3 ions, therefore, 1 mol of CaCl2 will...

(a) Chemical change  (b) Acidic and basic solutions can be prepared by dissolving the products of the above process in water  CaO+H2O →Ca(OH)2 (basic solution)  CO2 + H2O→H2 CO3 (acidic solution)

[Hint : They work well even with hard water and not form any scum.]

[Hint : They are non-ionic detergents. E.g.,Polyethylene glycol-stearate.]

(B) (ii) and (iii) Slaking of lime is accompanied by liberation of heat, hence it is an exothermic reaction. Calcium hydroxide is an alkali and its aqueous solution (i.e., lime water)...

(C) calcium carbonate Marble contains calcium carbonate and its chemical formula is CaCO3.​

(i) This is because the Ca2+ and Mg2+ ions present in hard water get precipitated as calcium and magnesium soap which being insoluble stick to the clothes as gummy mass. (ii)...

(i) Hard water contains calcium and magnesium salts. In hard water, soaps get precipitated as calcium and magnesium soaps which being insoluble stick to the clothes as gummy mass. (ii) Chloroxylenol...