Chemistry·MCQ Practice

Rules for Assigning Oxidation Numbers — MCQ Practice

NEET UG

Version 1Updated 22 Mar 2026

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Test your knowledge. Click “Solve” to reveal options, select your answer, then check the result. 6 questions available.

Q1medium

What is the oxidation number of chromium in $K_2Cr_2O_7$ ?

Q2hard

What is the oxidation number of sulfur in $H_2SO_5$ (Caro's acid)?

Q3medium

What is the oxidation number of nitrogen in $NH_4NO_3$ ?

Q4medium

Which of the following compounds contains oxygen with an oxidation number of $+2$ ?

Q5easy

In which of the following compounds does hydrogen exhibit an oxidation number of $-1$ ?

Q6hard

What is the average oxidation number of bromine in $Br_3O_8$ ?