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Question
Identify the following substance:
A brown gas D with the irritating smell.
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Solution
Nitrogen dioxide.
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What is a chemical formula?
Play a game for writing formula.
Example 2: A low-cost model for writing formulae: Take empty blister packs of medicines. Cut them in groups according to the valency of the element, as shown in the figure. Now, you can make formulae by fixing one type of ion into other.
For example:
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