Questions

Madhya Pradesh state has the maximum number of wildlife sanctuaries in India. It has total of 36 wildlife sanctuaries. In India, there are total 96 national parks and 510 wildlife sanctuaries.

The given compound is NaHCO3 Sodium bicarbonate which is commonly known as Baking soda.

Oxidation numbers are the charges on ions. When a neutral atom loses electrons it becomes positively charged. When a neutral atom gains electrons it becomes negatively charged.

Here the C represents the oxidation state of carbon in this compound. Compounds are electrically neutral, which is why we set the sum of the oxidation states equal to zero.

Sodium has a +1 oxidation state. Hydrogen has a +1 oxidation state. Oxygen has a -2 oxidation state. There are three oxygen atoms, which means the total oxidation state provided by both oxygen ions is -6. Adding up these oxidation states we get:

1 + 1 + (-6) + C = 0

-4 + C = 0

=> C = 4

This means the oxidation state of carbon in this compound is +4.

The payback period is how long it takes to recoup your investment. In this example, the cost was $4,000,000 and the savings was $800,000 per year. $4,000,000/$800,000 = 5. Therefore, Answer A, B and D are incorrect.