Discussion
Which of the following are examples of red-coloured inorganic household paint pigments ?
(a) BON maroon
(b) Brominated anthanthrone
(c) Cadmium mercury
(d) Cadmium selenide
Choose the correct answer from the options given below :
Answer: D
The red inorganic pigments are (c) and (d) only.
Cadmium pigments are inorganic: cadmium mercury red (cadmium sulphide with mercury sulphide) and cadmium selenide red (cadmium sulphoselenide) give bright, stable reds and maroons. In paint analysis, the elements cadmium, mercury and selenium detected by XRF or SEM-EDX identify them.
BON maroon (a metal salt of beta-oxynaphthoic acid) and brominated anthanthrone (Pigment Red 168) are organic pigments, so options including (a) or (b) are wrong.
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