Physics, Chemistry and Biology: Post your doubts here!

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Guys Urgent help 1 week left for board exams
And with Reasons needed god bless you guys
 

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chemistry paper 6
If water contained salt the reaction is faster or slower or no effect
it would be faster, that point was wrong over there.
even point 20 about cobalt chloride paper turning from pink to blue when hydrated is wrong, it will turn from blue to pink.
 
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