1. For monoatomic ions, the oxidation number is equal to

2. In case of peroxides and superoxides, oxidation number of oxygen respectively are

3. The algebraic sum of the oxidation number of all the atoms in a compound must be

4. What is the oxidation number of Cr in Na_2 Cr_2 O_7?

5. Select the compound in which chlorine shows oxidation state of +3?

6. The oxidation number of phosphorus in PCl5, P_2 O_5 and H_2 PO_3 respectively are

7. The decreasing order of oxidation number of Mn in the given compounds is

I. K_2 MnO_4            II. Mn_2 O_5                          III. MnO^-_4           IV. MnCl_2

8. An increase in the oxidation number of the element is termed as

9. A reagent, which can decrease the oxidation number of an element, is called

10. The correct explanation about the given reaction,

11.

12. Which of the following arrangements represent increasing oxidation number of the central atom?

13. The two effective drugs which act as life saving drugs for cancer therapy and AIDS victims respectively are

14. A measured temperature on Fahrenheit scale is 200°F. What will this reading be on Celsius scale?

15. In scientific notation, 0.00016 can be written as

16. The number of significant figures in Avogadro's number is

17. A student performs a titration with different burettes and finds titrate values of 25.2 mL, 25.25 mL and 25.0 mL. The number of significant figures in the average titrate value is

18. A bivalent metal has an atomic mass of 64u. The molecular mass of the metal nitrate is

19. An alkaloid contains 17.28% of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of alkaloid is

20. 25 g of an unknown hydrocarbon upon burning produces 88 g of CO_2 and 9 g of H_2 O. This unknown hydrocarbon contains

21. What will be the weight of CO having the same number of O-atoms as present in 22 g of CO_2 ?

22. In which case is the number of molecules of water maximum?

23. Find empirical formula of the compound if M = 68% (atomic mass = 34) and remaining 32% oxygen.

24. An organic compound on analysis was found to contain 10.06% carbon, 0.84% hydrogen and 89.10% chlorine. What will be the empirical formula of the substance?

25. When zinc reacts with dilute nitric acid, nitrous oxide is produced. What mass of the gas is evolved by treating 325 g zinc with excess of nitric acid?