Science, asked by lambha, 1 year ago

Q. which of the following substances is used as invisible ink?
a) ferrous sulphate
b) Nickel chloride
c) Cobalt chloride
d) All of these

Answers

Answered by aqibkincsem
1
Cobalt chloride is the substance which is used as an invisible ink. Cobalt chloride, the dilution solution of which is light pink, almost colourless.

If this may be used as an invisible ink.The writing goes blue on warming because of the dehydration of salt.

If you breathe on the paper the writing will disappear once again. And if a person wants to develop the message, he has to slowly pass the paper over some flame.
Answered by mindfulmaisel
1

Cobalt chloride is used as ‘invisible ink’.

Option: (c)

Explanation:  

  • Invisible ink is one which cannot be seen under normal lighting with naked eye but can easily be seen in the presence of laser light as a non-contrast with respect to the surrounding paper.  
  • Invisible ink is used to code a secret object and send it to others such that the middle man cannot incorporate it.  
  • Cobalt chloride decode or disrupt the material of the paper which can be understood only by the use of lasers.

Learn more about Cobalt chloride

How could you test for water in a hydrated cobalt chloride?

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Chemical eq to prepare from cobalt chloride chloropyridinecobaltoxime

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