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1. Write the molecular formulae of oxides of the following elements by referring to the Mendeleev’s periodic table:
Na, Si, Ca, C, Rb, P, Ba, Cl, Sn
1 Mark Each
→ The molecular formulae of the oxides are as follows:
Element Oxide Name
Na Na2O Sodium Oxide
Si SiO2 Silicon Dioxide
Ca CaO Calcium Oxide
C CO2 Carbon Dioxide
Rb Rb2O Rubidium Oxide
P P2O5 Phosphorus Pentoxide
Ba BaO Barium Oxide
Cl Cl2O Chlorine Monoxide
Sn SnO2 Stannic Oxide
2. Write the molecular formulae of the compounds of the following elements with hydrogen by referring to the Mendeleev’s periodic table:
C, S, Br, As, F, O, N, Cl
1 Mark Each
→ The molecular formulae of compounds with hydrogen are as follows:
Element Compound with Hydrogen Name
C CH4 Methane
S H2S Hydrogen Sulphide
Br HBr Hydrogen Bromide
As AsH3 Arsine
F HF Hydrogen Fluoride
O H2O Water
N NH3 Ammonia
Cl HCl Hydrogen Chloride

This page was last modified on
27 April 2020 at 23:49

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