# NEET Chemistry Redox Reactions Questions Solved

0.4g of a polybasic acid HnA (all the hydrogens are acidic) requires 0.5g of NaOH for complete neutralization. The number of replaceable hydrogen atoms in the acid and the molecular weight of 'A' would be : (Molecular weight of the acid is 96 gms.)

(1) 1, 95

(2) 2, 94

(3) 3, 93

(4) 4, 92

(3) Eq of Acid = Eq of base

n × $\frac{0.4}{96}\text{\hspace{0.17em}}=\text{\hspace{0.17em}}\frac{0.5}{40}$

n = $\frac{1}{80}\text{\hspace{0.17em}}×\text{\hspace{0.17em}}\frac{96}{0.4}\text{\hspace{0.17em}}=\text{\hspace{0.17em}}\frac{96}{32}\text{\hspace{0.17em}}=\text{\hspace{0.17em}}3$

∴ wt of A = 96 – 3 = 93.

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