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Questions  

The pairs of compounds which cannot exist together in aqueous solution are 

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By Expert Faculty of Sri Chaitanya
a
NaH2PO4 and Na2HPO4
b
Na2CO3 and NaHCO3
c
NaOH and NaH2PO4
d
NaHCO3 and NaOH

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detailed solution

Correct option is C

NaOH is a strong base whereas NaH2PO4 is a salt of strong base (NaOH) and H3PO4 (weak acid). Hence, NaOH and NaH2PO4 do not exist together in aqueous solution. NaOH is a strong base, whereas NaHCO3 is a salt of strong base (NaOH) and weak acid (H2CO3). Hence NaOH and Na2CO3 . Hence NaOH and Na2CO3 do not exist together.
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