Which of the following is the incorrect equation?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1.png"><img alt="applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1" class="alignnone size-full wp-image-208020" height="44" src="https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1.png" width="230"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1a.png"><img alt="applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1a" class="alignnone size-full wp-image-208021" height="41" src="https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1a.png" width="281"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1b.png"><img alt="applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1b" class="alignnone size-full wp-image-208022" height="39" src="https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1b.png" width="253"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1d.png"><img alt="applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1d" class="alignnone size-full wp-image-208023" height="50" sizes="(max-width: 527px) 100vw, 527px" src="https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1d.png 527w, https://www.sanfoundry.com/wp-content/uploads/2018/03/applied-chemistry-questions-answers-preparation-properties-applications-compounds-1-q1d-300x28.png 300w" width="527"/></a>