Which of the following metal (shown by its symbol) is generally used for making filaments of bulb?
1). Fe
2). An
3). Ag
4). W
2. Diamond is harder than graphite because of
4. Commercially sodium bicarbonate is known as
5. Which gas is used for converting vegetable oils into saturated fats ?
6. Which of the following is the petroleum wax
7. German silver used for making utensils is an alloy of
8. For photoelectric effect to take place, the metal used as the cathode should have_________
9. Stainless steel is an alloy of
10. The major harmful gas emitted by automobile vehicles which causes air pollution is