CBSE Class 9 Answered
Expert Answer
1. Magnesium oxide:
It is an ionic compound. While writing the formula of an ionic compound, the metal element is written on the left hand side and the non-metal element is written on the right hand side. Hence, the formula will be MgO.
2. Hydrogen chloride:
It is a molecular compound. While writing the formula of a molecular compound, the less electronegative non-metal is written on the left hand side whereas the more electronegative non-metal is written on the right hand side. Hence, the formula will be HCl.
3. Carbon dioxide:
It is a molecular compound. While writing the formula of a molecular compound, the less electronegative non-metal is written on the left hand side whereas the more electronegative non-metal is written on the right hand side. It has a prefix 'di' in the name means that the compound has 2 oxygen atoms. Hence, the formula will be CO2.
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