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Physics, Chemistry and Biology: Post your doubts here!

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Because, the question says wat is NOT present
and AL3+ and Zn2+ being Amphoteric react with NaOH and no ppt is formed
NH4+ doesnot form a ppt just ammonia is released
According to cations tests, they should form white ppt that is sol. in excess!
the ans is B-Ca , bcz Al & Zn are soluble & NH4 does not produce ppt
 
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i didn't get it :D
First, ammonium ion doesn't form a ppt..
Second, zinc and aluminium ions are soluble in excess, so they may have formed and then dissolved!
Moreover, the Q says: no ppt was formed because no ppt formed as NaOH WAS ADDED TOO QUICKLY not because of dissolving!
So answer must surely be Ca2+ as its ppt is insol. in excess which did not form as NaOH WAS ADDED TOO QUICKLY!!
 
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First, ammonium ion doesn't form a ppt..
Second, zinc and aluminium ions are soluble in excess, so they may have formed and then dissolved!
Moreover, the Q says: no ppt was formed because no ppt formed as NaOH WAS ADDED TOO QUICKLY not because of dissolving!
So answer must surely be Ca2+ as its ppt is insol. in excess which did not form as NaOH WAS ADDED TOO QUICKLY!!
thnx :).. got it (y)
 
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Hello, guyss pleaaasee aia need some help! :eek: how do we know if the specific given acid reacts with the metal or not plzzzzzzzzz
 
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Hello, guyss pleaaasee aia need some help! :eek: how do we know if the specific given acid reacts with the metal or not plzzzzzzzzz
i think you have to take it as ALL Acids, as we are not supposed to have knowledge of the reactivity of different acids...which paper is this from?
 
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