Teaching UKPSC Lecturer Mock Test Series 2024 General Science Chemistry Solutions

निम्न में से कौन-सा विलयन बफर के रूप में कार्य करता है?

1
HCI + NaCl 
2
NaOH + HCI 
3
CH3COOH + CH3COONa 
4
HCOOH + HCOONH4
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