WBJEE 2021 Physics and Chemistry Solved Paper

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CATEGORY - III (Q.76 to Q.80)
Carry 2 marks each and one or more option(s) is/are correct. If all correct answers are not marked and also no incorrect answer is marked then score = 2 × number of correct answers marked ÷ actual number of correct answers. If any wrong option is marked or if any combination including a wrong option is marked, the answer will considered wrong, but there is no negative marking for the same and zero mark will be awarded.
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Question : 77 of 80
 
Marks: +1, -0
Aqueous solution of HNO3,KOH,CH3COOH and CH3COONa of identical concentration are provided. The pair (s) of solutions which form a buffer upon mixing is (are)
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