Question

Q. Write the chemical formulae of following
compounds by criss cross method.
1] Hydrogen chloride
2]sulphuric acid
3]sodium hydroxide
4]potacium hydroxide
5]calcium hydroxide ​

Answer 1

First off we have hydrogen chloride, the valence of group 1 (for hydrogen) is +1 and the valence of group 17 (for chloride) is -1. And if we criss cross their valences we will be needing 1 atom of chloride and 1 hydrogen atom, and the chemical formula can be written as: HCl.

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5) Hydroxide ion (OH−) has a -1 charge on it, and we know the valence of calcium is +2 (group 2). Therefore, after crisscrossing for the chemical formula of calcium hydroxide, we will be needing one atom of calcium and 2 molecules of hydroxide ion, the chemical formula can be written as: Ca(OH)2.

Answer 2

Answer:

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