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Question

How to memorize or guess colour of any compound?

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Solution

In a simple way we can say

Mostly elements of s and p block forms colourless compounds, but compounds of transition elements shows vibrant colour. However, molecular bromine is brown in colour and molecular iodine shows violet colour.

For example :- Colour of KMnO4 is deep violet, K2Cr2O7 is orange in colour, HgI2 has a bloody red colour, colour of AgI is yellow etc.


Fe+2 ions generally forms green coloured compound. CuSO4 is blue in colour in hydrated form whereas it is white in anhydrous forms.​ Cl- ions forms white coloured salt. So,
CuSO4 = blue in hydrous and white in anhydrous forms.
CuCl = white in colour
FeSO4 = pale green




More ways

MNEMONICS:

It is a very powerful tool. It can make study very interesting. You can Enjoy your Learning. You can Easily remember things specially it is very useful in Learning Tables and Lists. In one word it can make your life easy.

If this is the whole list ....and there are no more to learn then it is very simple ....make name using these

Ni

Nikhar is very Green ...She is always happy. Visualise this scene. Try to connect with your real life Character/Friend/Contact so that when you see her. You easily Recall Ni.

Zn

Zindgi has become boring Colourless.

Cu

Cucumber: Visualise - There is a Huge Blue Cucumber and you are flying in the Blue sky seating on the Blue Cucumber Like Harry Potter did on Broom

Curiosity

I search on the net and fortunately i found this in color of BLUE

Cu .sound Q ....blue ...same sound

You can also make trick for number attached 2 or 3 or 4 ...

Ti

valen TINA is looking gorgeous in Purple dress

V4

V for win ...Blue is color of WIN

V3

Third color of Tricolor flag is Green

After connecting metal and color you can connect first coloum 0, 0 , 1,1,2,2,3,3,4,.....with the use of place memory or adding any word that can complete your line.
You can also use Peg system here
0 orange
1 pen or pencil
2 duck
3 glasses
4 chair
5 fingers

Also use visualization technique see this list for some time close your eyes and visualize the color.
visualize like this….. where is Zn situated ? ...last ...

where is Ni ...Cu ...

Apply above also and you can better recall




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