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Atoms and Molecules EXERCISES Solutions
- Q1: A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.
- Q2: When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen? Which law of chemical combination will govern your answer?
- Q3: What are polyatomic ions? Give examples.
- Q4(a): Write the chemical formulae of the following. (a) Magnesium chloride
- Q4(b): Write the chemical formulae of the following. (b) Calcium oxide
- Q4(c): Write the chemical formulae of the following. (c) Copper nitrate
- Q4(d): Write the chemical formulae of the following. (d) Aluminium chloride
- Q4(e): Write the chemical formulae of the following. (e) Calcium carbonate.
- Q5(a): Give the names of the elements present in the following compounds. (a) Quick lime
- Q5(b): Give the names of the elements present in the following compounds. (b) Hydrogen bromide
- Q5(c): Give the names of the elements present in the following compounds. (c) Baking powder
- Q5(d): Give the names of the elements present in the following compounds. (d) Potassium sulphate.
- Q6(a): Calculate the molar mass of the following substances. (a) Ethyne, $C_2H_2$
- Q6(b): Calculate the molar mass of the following substances. (b) Sulphur molecule, $S_8$
- Q6(c): Calculate the molar mass of the following substances. (c) Phosphorus molecule, $P_4$ (Atomic mass of phosphorus = 31)
- Q6(d): Calculate the molar mass of the following substances. (d) Hydrochloric acid, HCl
- Q6(e): Calculate the molar mass of the following substances. (e) Nitric acid, $HNO_3$
Chapters in CBSE - Class 9 Science
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