CLASS VIII SCIENCE CHAPTER – 5 Coal and Petroleum Assignment |
Q.1 Fill in the blanks:- |
(i) On heating in air, coal mainly produces ________ gas. |
(ii) ________ is an almost pure form of carbon. |
(iii) Coal tar is a mixture of about ________ substance.. |
(iv) Now a days ________, a petroleum product is used in place of ________ for metalling the roads. |
(v) ________ is obtained during the processing of wood to get coke. |
Q.2 What are natural resources? |
Q.3 Give three examples of natural and man-made material? |
Q.4 What are the two kinds of natural resources? Explain giving examples? |
Q.5 What are fossil fuels? Give three examples? |
Q.6 Write three uses of coal? |
Q.7 What is meant by carbonization? |
Q.8 Write two uses of coke? |
Q.9 Name four substances which are manufactured using products obtained from coal tar? |
Q.10 How is petroleum formed? |
Q.11 name three places in India where petroleum oil is found. |
Q.12 What is petroleum refining? |
Q.13 Write two uses of petrol, kerosene, diesel, paraffin wax and bitumen? |
Q.14 Why is CNG being used as a fuel for vehicles? |
Q.15 Explain why should we use fossil fuels only when absolutely necessary. |
Q.16 What is the full form of LPG and CNG? |
Q.17 What are the tips given by PCRA to save petrol and diesel? |
Q.18 Why is petroleum called black gold? |
Q.19 Give two advantages of natural gas as a fuel. |
Q.20 Explain why coal, petrol and diesel oil will be exhausted one day. |
NCERT Activity Chapter 02 Acid Bases and Salt Class 10 Chemistry Activity 2.1 Indicator Acid Base Red litmus No Change Blue Blue Litmus Red No change Phenolphthalein Colourless Pink Methyl Orange Pink Yellow Indictors are substance which change colour in acidic or basic media. Activity 2.2 There are some substances whose odour changes in in acidic or basic media. These are called olfactory indicators. Like onion vanilla, onion and clove. These changes smell in basic solution. Activity 2.3 Take about 5 mL of dilute sulphuric acid in a test tube and add few pieces of zinc granules to it. => You will observe bubbles of hydrogen gas on the surface of zinc granules. Zn + H2SO4 --> ZnSO4 + H2 => Pass the Hydrogen gas through the soap solution. Bubbles formed in the soap solution as Hydrogen gas it does not get dissolved in it
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