Among the following, the number of anhydrides of acids are $\mathrm{CO}, \mathrm{NO}, \mathrm{N}_{2} \mathrm{O}_{3}, \mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{N}_{2} \mathrm{O}_{5}, \mathrm{SO}_{3}$ and $\mathrm{P}_{4} \mathrm{O}_{10}$
(a)3
(b)4
(c)5
(d)6
Answer
Answer: C ✓ checked by 4AB · confidence high
The source book printed A; on checking, C is correct — see the explanation.
Book printed (a).
Explanation
Acid anhydrides: N₂O₃, B₂O₃, N₂O₅, SO₃ and P₄O₁₀ — five; CO and NO are neutral oxides (c).