State whether the following statements are true or false:
(a) Coke is almost pure from carbon.
(b) Coal tar is a mixture of various substances.
(c) Kerosene is not a fossil fuel.
(d) CNG is more polluting than petrol.
(e) Fossil fuels can be made in the laboratory.
(a) True.
(b) True.
(c) False.
Explanation: Kerosene is a fossil fuel. It is used as a fuel for stoves, lamps and for jet aircrafts.
(d) False.
Explanation: CNG is less polluting than petrol. It is a clean burning fuel. It produces 45% less hydrocarbons than petrol.
(e) False.
Explanation: The formation of fossil fuels is a very slow process. These are formed under very high pressure and high temperature. The conditions for their formation cannot be created in the laboratory.
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- Tick True/False against the following statements.(a) Fossil fuels can be made in the laboratory.(b) CNG is more polluting fuel than petrol.(c) Coke is an almost pure form of carbon.(d) Coal tar is a mixture of various substances.(e) Kerosene is not a fossil fuel.
- Tick True/False against the following statements :Fossil fuels can be made in the laboratory. (T/F)CNG is more polluting fuel than petrol. (T/F)Coke is almost pure form of carbon. (T/F)Coal tar is a mixture of various substances. (T/F)Kerosene is not a fossil fuel. (T/F)
- CNG can be more polluting than petrol. (True or False)
- Which of the following is not a fossil fuel?(a) LPG (b) natural gas (c) biogas (d) CNG
- State whether the following statement is true or false :Milk is a pure substance.
- Which of the following is not a mixture?(a) kerosene (b) air(c) alcohol (d) petrol
- Fill in the following blanks with suitable words:(a) Fossil fuels are…………and…….(b) Coal contains mainly……………(c) The slow process of conversion of dead vegetation into coal is called……………(d) The process of separation of different constituents from petroleum is called………………(e) The least polluting fuel for vehicles is…….(f) The burning of fossil fuels causes air………….and also leads to global……………
- Which one of the following is not a fossil fuel?petrolcokecharcoalcoa
- (a) What are fossil fuels? Give three examples of fossil fuels.(b) Describe how fossil fuels were formed.(c) Explain how, sun is considered to be the ultimate source of fossil fuels.(d) Which fossil fuels were formed by the buried remains of small plants and animals?(e) Which fossil fuel formed by the buried remains of large land plants?
- Which of the following combination of terms has no fossil fuel?(a) wind, ocean, coke (b) kerosene, tide, wind (c) wood, wind, sun (d) petrol, wood, sun
- State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.(a) Cutting a log of wood into pieces is a chemical change. (True/ False)(b) Formation of manure from leaves is a physical change. (True/ False)(c) Iron pipes coated with zinc do not get rusted easily. (True/ False)(d) Iron and rust are the same substances. (True/ False)(e) Condensation of steam is not a chemical change. (True/ False)
- Name a fossil fuel other than coal and petroleum.
- (a) What are fossil fuels? Name three fossil fuels.(b) Describe how, fossil fuels were formed.
- Fill in the blanks.(a) Coal is one of the………….used to cook food.(b) When heated in air, coal burns and produces mainly ……….gas.(c) Coal tar is a black, thick ……….with an …………. smell.(d) Petroleum, ………….. and ……….. are fossil fuels.(e) Forests and coal are ……….. natural resources.
- Fill in the blanks.(a) The slow process of conversion of dead vegetation into coal is called __________.(b) Coal and petroleum are formed from the dead remains of organisms and are known as __________.(c) The black thick liquid with __________ smell is known as coal tar.(d) During the processing of coal to get coke, coal tar and __________ are also obtained.(e) The process of separating the various constituents of petroleum is known as __________.(f) Excessive burning of fossil fuels is a major cause of __________.
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