Marble contains _______.
(A) calcium hydroxide
(B) calcium chloride
(C) calcium carbonate
(D) calcium oxide
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A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random.
Solution: Total number of outcomes = 5 + 8 + 4 = 17 Number of red marbles = 5 Number of white marbles = 8 Number of green marbles = 4 (i) Red? Solution: Probability of red...
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Write down the formula of (i) sodium oxide (ii) aluminium chloride (iii) sodium suphide (iv) magnesium hydroxide
(i) Sodium oxide → Na2O (ii) Aluminium chloride → AlCl3 (iii) Sodium suphide → Na2S (iv) Magnesium hydroxide → Mg(OH)2
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Write the chemical formula of the following: (a) Magnesium chloride (b) Calcium oxide (c) Copper nitrate (d) Aluminium chloride (e) Calcium carbonate
(a) Magnesium chloride →MgCl2 (b) Calcium oxide →CaO (c) Copper nitrate →Cu(NO3)2 (d) Aluminium chloride →AlCl3 (e) Calcium carbonate →CaCO3
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On heating calcium carbonate gets converted into calcium oxide and carbon dioxide. (a) Is this a physical or a chemical change?
(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)
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Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor.
(a) wet marble floor, dry marble floor, newspaper and towel
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If water contains dissolved calcium hydrogen carbonate, out of soaps and synthetic
Synthetic detergents are preferred for cleaning clothes. When soaps are dissolved in water containing calcium ions, these ions form insoluble salts that are of no further use. However, when synthetic detergents...
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A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile
(a) is a better conductor of heat than the wooden tile.
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Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime.
(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)...
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The major chemical compound found in kidney stones is : (a) urea (b) calcium carbonate (c) calcium oxalate (d) calcium sulphate
(c) The composition of kidney stone is Calcium oxalate – 80% Uric acid – 5% Amino acid cystine – 2 % Magnesium and – 13% ammonium phosphate
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Write two important uses of each of the following: (i)Sodium carbonate (ii)Sodium Hydroxide (iii)Sodium hydrogen carbonate
(i) Sodium carbonate :for softening of hard water ,laboratory reagent. (ii) Sodium hydroxide: in the manufacture of soap, in the purification of bauxite. (iii) Sodium hydrogen carbonate: as a mild antiseptic, as...
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