3) Differentiate between on atom and its ion. Take on example to illustrate your difference.
4) Magnesium and oxygen combine in the ratio 3 : 2 to form magnesium oxide. How much
oxygen will be required to react completely with 12 gm of magnesium ?
5) Calculate the ratio by mass of atoms present in a molecule of carbon dioxide. Given
carbon = 12. oxygen = 16.
Q.3 Long answer questions. (5 marks each)
1) Calculate the number of moles of ammonium sulphate present in 15.84 kg of it.
CH = 1. N = 14 O = 16 s = 32
2) Find the total percentage of oxygen in magnesium nitrate crystals i.e. Mg(NO3)2 6H2O
3) Calculate the mass of
(a) 0.1 mole of H2SO4 (b) 0.05 mole of Ammonia. (c) 0.7 mole of HCI.
4) An element X forms an oxide with formula x203.
1) State the valancy of 'X'
m) Write the formula of (a) Chloride (b) Sulphate
5) Find out the ratio by mass of the combining elements in the following compounds.
0) MgCO3 ii) CaCl2
ii) Ca(OH)2
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