German silver used for making utensils is an alloy of
1). copper silver nickel
2). copper zinc nickel
3). copper zinc aluminium
4). copper nickel aluminium
1. The wire of flash bulb is made of:
2. When formaldehyde and potassium hydroxide are heated we get
5. When formaldehyde and potassium hydroxide are heated we get
6. Hydrochloric acid is also known as
7. Which of the following is caused by the higher concentration of Nitrogen and Phosphorous ?
8. An electric iron has a heating element made of:
9. Which variety of coal contains recognizable traces of the original plant material
10. _________ gets converted to phosgene, when exposed to sunlight.