Which of the following is/are true for a...

Which of the following is/are true for an acid -base titration?

Indicators catalyse the acid base reactions by releasing or accepting `H^(+) ` ions.

Indicators do not significantly effect the pH of the solution to which they are added

Acid- base reactions do not occur in absence of indicators

Indicators have different colours in dissociated and undissociated forms.

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The correct Answer is:

B, D

Indicactors only show end point ,they are weak acids or bases

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Which of the following species formed in acid base reactions can act as Bronsted buses as well as Bronsted acids?

`[Fe(H_(2)O)_(6)]^(2+)`

`HPO_(4)^(2-)`

`HSO_(4)^(-)`

`NH_(4)^(+)`

`HPO_4^(2-) , PO_4^(3-)`

` H_2PO_4^(-) ,HPO_4^(2-)`

` H_2PO_4 ^(-) , H_3PO_4`

` H_2PO_4^(-) , PO_4 ^(3-)`

`HPO_4^(2-) , PO_4^(3-)`

` H_2PO_4^(-) ,HPO_4^(2-)`

` H_2PO_4 ^(-) , H_3PO_4`

` H_2PO_4^(-) , PO_4 ^(3-)`