Cooking gas is a mixture of
1). methane and ethylene
2). carbon dioxide and oxygen
3). butane and propane
4). carbon monoxide and carbon dioxide
1. $H_{2}O$ is liquid and $H_{2}S$ is a gas because -
2. What material is used to make electric heater coil ?
4. Among the following, which is always found in free-state in nature?
6. Question 6.11:What criterion is followed for the selection of the stationary phase inchromatography?
7. Ruby and sapphire are oxides of
8. Which electro magnetic radiation is emitted by radioactive substance-