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Consider the following statements about hydrocarbons. i. Alkanes are saturated hydrocarbons that contain single bonds. ii. Alkynes are unsaturated hydrocarbons that contain one or more double bonds.  iii. Alkenes are Unsaturated hydrocarbons that contain one or more triple bonds.   
Study the following statements.
1. Petroleum is a major source of aliphatic hydrocarbons.
2. Coal is a source of aromatic hydrocarbons.
3. Petroleum is commonly called liquid gold.
Which of the statements given above are correct?
Statement I Petroleum is a mixture of many different hydrocarbons of different densities.
Statement II The grade of petroleum, depends mainly on the relative proportion of the different hydrocarbons.
Which of the following statements regarding static methods are correct?
1. Static methods are difficult to maintain, because you can not change their implementation.
2. Static methods can be called using an object reference to an object of the class in which this method is defined.
3. Static methods are always public, because they are defined at class-level.
4. Static methods do not have direct access to non-static methods which are defined inside the same class.
Consider the following statements.
1. Carbon black is obtained when methane is heated in absence of air.
2. Kerosene is a mixture of alphatic hydrocarbons.
3. Most of hydrocarbons from petroleum are obtained by fractional distillation.
Which of the statements given above are correct?
Assertion (A) Hydrocarbons are very good fuels.
Reason (R) The main sources of hydrocarbons are natural gas, petroleum and coal.
Select the incorrect statement with respect to petroleum: A. It should be used more often as it is highly energy efficient. B. Crude petroleum is cleaned and separated at a refinery.  C. It is used for dry cleaning, for making plastic and paints etc. D. Petrol, diesel kerosene are the only forms of petroleum.
1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour?
The pressure of acetylene in welding torch for oxy-acetylene welding is maintained at _________
Theoretical volume of oxygen required for complete combustion of 1 Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3 .