Powdered, granular, or pasty solids that can be easily ignited by brief contact and whose combustion byproducts can be toxic are described as which type?

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The main idea here is how solid materials are classified by how easily they ignite and what their burning produces. Powdered, granular, or pasty solids that can be ignited with only brief contact and that can release toxic byproducts when they burn are described as combustible solids. The form—being fine and powdery or paste-like—increases surface area and makes ignition easier, so a small spark or brief contact can start combustion. The fact that the combustion products can be toxic means this material poses serious hazard during burning, aligning with the combustible solids category that covers solids capable of burning and producing hazardous fumes. The other labels don’t fit as well: flammable solids imply even more readily ignitable behavior or different hazard characteristics; readily combustible solids emphasize rapid ignition but not necessarily toxic combustion byproducts; explosive powders describe a different, explosion-related hazard.