21. What is the most common element in the world?
22. What is the only by-product of hydrogen fuel-cells?
23. What is the strength of 20 volume solution of H2O2?
24. When MnO4 reacts with H2O2 in basic medium then following species are involved, except
25. When sodium peroxide is treated with dilute sulphuric acid, we get
26. Which group forms hydride?
27. Which of the following compounds is used for water softening?
28. Which of the following hydrides is electron-precise hydride?
29. Which of the following ions will cause hardness in water sample?
30. Which one is ionic hydride in nature?
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