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SR 53(7) 60-61.Pdf UIZ Q CHANDRAYEE G. BHATTACHARYYA UN F 1. Alizarin, a red dye originally obtained from the root of the 6. Some species of Lichen are used to produce dyes. A er common madder plant, in which it soaking in dilute ammonia,, colour of lichens is ac vated,, occurs combined with the sugars Umbilicaria spp produces xylose and glucose. Which one of a magenta, Evernia spp the following is Alizarin? yields amethyst violet (a) Rubia nctorum while___spp, gives (b) Alizaria nctoria cyano c blue. (c) Zingiber offi cinale (a) Lecanora spp. (d) Raphanus sa vus (b) Usnea spp. (c) Cladonia spp. (d) Xanthoria spp. 2. The success of the fi rst commercial synthe c dye, _______ led to demands by English tex le manufacturers for 7. In the chemistry lab, we have other new dyes. By trial and error, seen Litmus paper; it contains reac ons of coal tar compounds were a dye obtained from a lichen- found to yield useful dyes. species that turns red under (a) Cine brine acidic condi ons & blue under (b) Mauve alkaline condi ons. Do you know (c) Purple which species of Lichen is this? (d) Magenta (a) Rocella spp (b) Adalia spp 3. Earlier this vegetable dye, Curcuma (c) Umbilicaria spp longa was used for the prepara on of (d) Bryoria spp natural colours for pain ngs. (a) Radish (b) Ginger (c) Turnip (d) Turmeric 8. It is the common name of the dye (the synthe c azo dyes used as a stain in microscopy). This red dye is used to stain thick cell 4. There was also interest in the eff ects of dyes on living ssue. wall of various plant cells In 1884 the Danish microbiologist especially sclerenchyma and Hans Chris an Gram discovered that Xylem elements. crystal _______ irreversibly stains (a) Safranin certain bacteria. The dye has been (b) Eoosin widely used ever since for the Gram (c) Orchil stain technique. (d) Methionine (a) Violet (b) Red (c) Green (d) Yellow 9. This is a plant of Chenopodiaceae, a summer vegetable, swollen roots are cooked as 5. Around the year 1850, these used as mordants, were found vegetables. It is one of the to provide superior dye reten on and, in me, largely prominent vegetable dyes. displaced the others; The red dye o en lends chromium mordants are s ll colour to the dishes and it widely used for wool and, to can be used as fabric dye some extent, for silk and nylon. also. (a) Sodium salts (a) Beta redda (b) Potassium salts (b) Chenopodium red (c) Chromium salts (c) Chenopodium beeta (d) Cadmium salts (d) Beta vulgaris Science Reporter, JULY 2016 60 FUNQUIZ 10. Many lichens contain earthy red, brown, russet, violet & 16. It is a brown pigment prepared from cu lefi sh ink, used in blue pigments, used as fabric-dyes for co on & wool since monochrome drawing and me of ancient Greece. Na ve in water-colours. Americans use boiled lichen extracts (a) Kinetochore to produce dyes. Which one is such (b) Chromomere Galilio’s studies of the Moon, 1609; in the a kind of dye? (c) Chromophore Biblioteca Nazionale, (a) Orchid (b) OrƟ t (d) Sepia Florence. (c) Orchil (d) Orochotonm 17. Which ancient wri ng system described 11. By 1900, by the infl uence of Hofmann, extrac on and applica on more than 50 compounds had been of natural dyes? isolated from_______, many of which (a) StraƟ graphy were used in the developing German (b) Calligraphs chemical industry. (c) Hieroglyphs (a) Coke (b) Coal (d) None of the above (c) Coal tar (d) Petroleum 18. The dyes such as Indigo, Tyrian purple and Alizarin were 12. Only one natural dye, _______ used in ancient mes, and even today one of these remains a (Haematoxylum campechianum) favorite dye for denim as in blue jeans. a tree of the pea family, used (a) Indigo mainly to dye silk and leather. (b) Tyrian purple (a) Kermes (c) Alizarin (b) Logwood (d) None of the above (c) Madder (d) FusƟ c 19. Virtually all dyes were obtained from natural sources ll 13. One of the English chemists, 1850s. Which one of the _____ trained by von Hofmann, best following remained the known for his accidental discovery main source? of the dye mauve. (a) Fruits (a) George Boole (b) Spices (b) Robert Boyle (c) Vegetables (c) William Perkin (d) Animals (d) John Michell 20. Solid evidence that dyeing methods are more than 14. It is a bright crimson coloured pigment obtained from 4,000 years old has crushed and dried bodies of cochineal insects. These insects been provided by were fi rst raised and then the dyed fabrics found dried bodies were crushed to in_______. obtain the beau ful colour dye (a) EgypƟ an tombs popularly called Cochineal dye. (b) Ellora painƟ ng (a) Eosin (c) Ajanta painƟ ng (b) Orcein (d) Sumerian tombs (c) Carmine (d) Safranin Answers: 15. Alum, as well as iron, copper, and n salts were common 1.a 2.b 3.d 4.a ancient ______, which were also 5.c 6.d 7.a 8.a used to vary the colours produced 9.d 10.c 11.c 12.b from a single dye. 13.c 14.c 15.c 16.d (a) ByzanƟ ans 17.c 18.a 19.c 20.a (b) Tyrians (c) Mordants Contributed by Ms. Chandrayee G. Bhattacharyya, B-23, Birla Sagar Colony, (d) Vaƫ ans Porbandar–360576, Gujarat 61 Science Reporter, JULY 2016.
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