Formulae of chemical compounds — task. Science State Board, Class 7.

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Select the correct formulae of chemical compounds:

1. Aluminium chloride

$Al {Cl}_{3}$
${Al}_{2} {Cl}_{3}$
$Al {Cl}_{2}$
$3Al {Cl}_{3}$

2. Ravi's teacher asked him to write a chemical formula for ammonium hydroxide on the board, and he wrote it correctly as _________.

$NH (OH)$
$NH {(OH)}_{2}$
${NH}_{2} (OH)$
${NH}_{4} OH$

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