Welcome to your chemistry Quiz 2

1. Gas is found to have the formula (CO)n. Its vapour density is 70. What must the value of n be? 
2. How many moles are there is 140 g of Si (atomic mass of silicon is 28)? 
3. What is the maximum number of hydrogen bonds in a H2O molecule?
4. By what factor is a solution with pH = 2 more acidic than one with pH = 6?
5. 4.4 g of CO2 contains how many litre of CO2 at STP?
6. What is the Electron affinity of noble gases?
7. What is the ratio of rate of diffusion of oxygen and hydrogen?
8. Absolute zero is the temperature where all gases are expected to have howmuch volume?
9. What is the Oxidation state of Mn in acidic KMnO4 change from?
10. What is the oxidation of two Cl atoms in bleaching powder Ca(OCl) Cl?

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