BioMedical Admissions Test (BMAT) 2026 – 400 Free Practice Questions to Pass the Exam

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What is the charge of the nitrate ion represented as NO3?

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The nitrate ion, represented as NO3, has a charge of 1-. This is because the molecule is made up of one nitrogen atom and three oxygen atoms. The nitrogen atom typically has a valency of +5 in nitrates, while each oxygen atom typically has a valency of -2. Therefore, when you account for the charges:

The total positive charge from nitrogen is +5, and the total negative charge from the three oxygen atoms is -6 (3 x -2).

When you combine these charges, +5 + (-6) equals -1, which gives the nitrate ion its overall charge of 1-. This is crucial in understanding the role of nitrate in various chemical reactions and its functioning in biological systems, such as its role in the nitrogen cycle.

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