1. Cement is usually a mixture of :
2. Sodium bicarbonate is commercially known as
3. Which of the following is the main nitrogenous waste in humans ?
4. Quartz is a crystalline form of
5. Urea is a
6. Oxygen has (+) oxidation number only in
7. The oxidation number of nickel in K4[Ni(CN)4] is
8. How many neutrons are there in 92U238 atom ?
9. The number of neutrons present in an element having mass number 226 and atomic number 88 is :
10. Who modified Bohr's theory by introducing elliptical orbits for electron path?
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