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Dyes
Dye is a synthetic and natural colouring matter that is employed in solution to stain materials particularly fabrics. All the coloured substances are not dyes. A coloured substance is known as a dye if it fulfills the subsequent conditions,
1. It should have an appropriate colour.
2. It may be lasting on the fabric either directly or with the help of mordant.
3. while fixed it must be fast to light and washing, that is it has to be resistant to the action of acids, water and alkalies, majorly to alkalies as washing soda and soap have alkaline nature.
Q. What is SI unit of energy? Ans. The SI unit of energy is called the joule. A joule is a pretty small mount of energy so often chemists will use the unit kJ =1 kilojoule
Pick out the isoelectronic structures from the following : CH + 3 , H 3 O + NH 3 CH - 3 I
Coordination no. is the no. assigned to an atom which tells us that how many other atoms are directly attached to it. eg. Pcl5 the cordination no. will be 5
What is meant by a link solution ?
preparations and structure borazole?
Selecting and Numbering the principal chain Selecting the principal chain : choose the longest continuous chain of carbon atoms consisting of the principal functional
Application of mesomeric effect (A) Low reactivity of vinyl halides and aryl, (B) The acidic behavior of carboxylic acids, (C) Basic character comparison of aniline and e
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#questionprepare acetaldehyde from acetylene ..
How many gaseous elements are there in the s block of modern periodic table? What are they??
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