PPSC Chemistry Part II Organic Chemistry Online Test With Answers

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PPSC Chemistry Part II Organic Chemistry Online Test

Sr. # Questions Answers Choice
1 The dye which is a constituent of Skiffs reagent used for detection formaldehyde group is. Gentain violet Megneta Phenolphthalein Rosolic acid
2 Which of the following is a triphenylmethane dye. Auramine G Crystal violes Fluorescein Fast green O
3 An example of nitro dyes is. Martius yellow Auramine O Malachite green Methyl red
4 Which of the following is not a characteristic of dye. It must have suitable colour It must be able to fix to fibre It must be fast to wash and lights It must be highly soluble in water
5 Dyes which can be applied to cellulosic fibre from water solution are called. Ingrain dyes Substantive dyes Mordant dyes Vat dyes
6 The dyes which are produced on the fibre in suit by reactions are known as. Mordant dyes Fast dyme Ingrain dyes Disperse dyes
7 Vet days are generally applied to the fabric in the form of. Mordants Leuco base Oxidised base Dispersed dyes.
8 A mordants is substance which in Coloured Leuco -base of a dye Fixes dye on the fabric All of these
9 Which of the following is not a naturally occurring dye. Indogo Indigotin Alizarin Malachite green
10 For a compound to act as a dye it must have A suitable colour Ability to fix to fibre Both A and B None of these
11 Conjugation of chromophore Deepens the colour Lightene the colour Shifts absorption to shorter wavelength All of these
12 The light absorbed in UV and visible region causes. Vibrational energy changes Rotational energy changes Electronic excitation All of these
13 An auxochrome is a group which Absorbs in UV region Absorbs in visible region Absorbs in IR region Increase absorption wavelength of chromophore
14 A group that causes deepning of the colour is known as Bathchromic Hypsochromic Hypochromic Hyperchromic
15 A chromophore is an isolated fractional group which has Coloured appearance Absorption in UV visible region Only sigma bonds Absorption in the region
16 An example of acyclic polytropenoid is Myrcone Buna -S Synthetic rubber Natural rubber
17 A terpenoid which as an alcoholic group in the molecule is Citral Camphor Menthol Carvone
18 a- pinene hydrochloride on warming rdarranges to form bornyl chloride.The rearrangement is known as. Pinacol pinacolone Hofinann Wager Mecrwein Wolff
19 Oil of turpentine contains. a-pinene p- pinene Both A and B None of these
20 Peppermint oil contains. Menthol Thymol a-pinene Comphene
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