It's a compound of hydrogen and oxygen
The entire range of electromagnetic frequencies is known as C, the electromagnetic spectrum.
Television remote controls (D) do NOT use radio waves (they use infrared radiation).
A material that allows some, but not all, light to pass through it, would be described as translucent (C).
Hydrogen (H2). A single replacement reaction occurs where the metal bonds with Cl and replaces the metal-acting Hydrogen
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