Arcticturn Chem Prep

2024

$8$ . Which substance may be treated with bleach (sodium hypochlorite) to render it less hazardous?

$\textbf{(A)}~$ Sodium Cyanide $\qquad\textbf{(B)}~$ Ammonia $\qquad\textbf{(C)}~$ Hydrochloric acid $\qquad\textbf{(D)}~$ Ozone

$9$ . Which indicator would be most suitable for a titration to determine the concentration of ammonia in a window cleaning solution using aqueous HCl?

$\textbf{(A)}~$ Eriochrome Black T $\qquad\textbf{(B)}~$ Ferroin $\qquad\textbf{(C)}~$ Methyl orange $\qquad\textbf{(D)}~$ Phenolphthalein

11. Ethane, C2H6, and diborane, B2H6, do not adopt analogous molecular structures. Which experimental technique would be least useful in establishing this fact?

(A) Infrared spectroscopy

(B) Mass spectrometry

(C) Nuclear magnetic resonance spectroscopy

(D) X-ray crystallography

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Arcticturn Chem Prep

2024