Which of the following mixtures can act as buffer?

1.	Which of the following mixtures can act as buffer?
Answer» `H_2CO_3+ NaOH (1.5 : 1` MOLAR ratio) `H_2CO_3+NaOH (1.5 : 2 `molar ratio) `NH_4OH + HCl (5 : 4` molar ratio) ` NH_4OH +HCl (4: 5` molar ratio) Solution :` {:(H_2CO_3 +, NaOH , to NaHCO_3+H_2O ) ,(1.5M , 1M, 0),(1.0, -, 1M),( 0.5M,, ):}` guffer is FORMED (b)` {:( H_2CO_3 + , NaOH to ,NaHCO_3+H_2) , ( 1.5M , 2M, 0),( -, 1.5M , 1.5 M),( , 0.5 M , ):}` ` {:( NaHCO_3+ , NaOH to , Na_2CO_3+H_2O ),( 1.5 M, 0.5 M , 0 ),( 0.5 M ,- , 0.5 M),( 1.0 M,, ) :}` buffer is formed ( C) ` {:( NH_4 OH +, HCl to, NH_4Cl + H_2O ),( 5M, 4M, 0),(4M, -, 4M),( 1M,, ):}` (d)ACID is excess

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