That makes things yellow
Pigment called Indian yellow was used to render a vivid yellow colour in paintings and frescoes, especially when viewed under sunlight. Name the acid whose salts are the primary components of this pigment.
QUESTION 1
Name the class of pigments that impart a yellow colour to pumpkins, egg yolk, canaries, and da odils, among other naturally occurring life-forms. Flamingoes also get their characteristic pink hue by consuming food containing pigments of this class.
◣ QUESTION 2
Two colours are said to be complementary if, when they are mixed, the result is a greyscale colour. In the RGB colour scheme – which uses red, green, and blue as the primary colours – what is the complementary colour of yellow?
◣ QUESTION 3 QUESTION 4
Name the chemical compound responsible for the yellow-red hues of sa ron dye. Studies have found this compound has anti-inflammatory properties, as well as a potential ability to disrupt processes involved in the progression of Alzheimer’s.
◣ QUESTION 5
Chrome yellow is a popular yellow pigment, and was particularly so in the
19th century. Its principal component is the compound ____ ________. A French chemist discovered this fact when he was studying a naturally occurring form of the compound called crocoite. Fill in the blanks.
Answers to May 21 quiz:
1. Assistant in Davy’s lab who liquefied many gases in 1823
– Ans: Michael Faraday
2. German physicist who tried to explain an electron’s path in a solid metal
– Ans: Paul Drude
3. E ect that Sommerfeld’s quantum mechanics models couldn’t explain
– Ans: Kondo e ect
4. Person with whom Dorda and Pepper discovered quantum Hall e ect
– Ans: Klaus von Klitzing
5. Physicists who produced the first Bose-Einstein condensates
– Ans: Eric Cornell, Carl Wieman, Wolfgang Ketterle
Visual: Philip W. Anderson
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K.N. Viswanathan