Bronze is an alloy of
1). Copper & tin
2). Copper & zinc
3). Copper & iron
4). Iron & nickel
1. Chemical name of vinegar is
2. In which of the following substances all carbon atoms are quaternary in nature ?
4. Which of the following fuels causes minimum environmental pollution?
5. Man dies in the atmosphere of CO, because it
6. How many electrons can be accommodated in d-orbital?
7. Which of the following is a renewable source of energy ?
8. The most common cause of pollution of air is