Among the following the hardest metal is
1). Gold
2). Iron
3). Platinum
4). Tungsten
1. What material is used to make electric heater coil
2. Alcoholic fermentation is brought about the action of -
3. When water itself combines chemically with some element or mineral it is called
4. Who developed Hydrogen Bomb?
5. LPG is a mixture of _______.
6. Which of the following is used to remove rust stains on cloth?
7. Which of the following is used to increase the antiknocking property of petrol