Class 8 - Chemistry Set 4
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1. Which one is used for making shoe polishes? *
1 point
2. When super heated steam is passed through
 red hot coke, it gets reduced to a mixture of X,
 Y and it is named as Z.
 Identify the mixture Z. *
1 point
3. The salt used in soda acid fire extinguisher is *
1 point
4. Why fire goes off when water is poured over burning wood? *
1 point
5. The different varieties of coal differ in their *
1 point
6. Any substance which gives heat and light on combustion is called *
1 point
7. A ______ is a thread or filament like material
 which is so strong and flexible that we can use
 it for various purposes. *
1 point
8. Raw material used to synthesis synthetic fibre is ______. *
1 point
9. Which of the following do not soften upon heating? *
1 point
10. The reactivities of iron, magnesium, sodium and
 zinc towards water are in following order *
1 point
11. An example of thermosetting plastic which is also a poor conductor of heat and electricity – *
1 point
12. An area left out for growth of vegetation,
 generally, in cities and towns for reduction of
 CO2
 levels and release of O2
 in atmosphere is *
1 point
13. Coal, petroleum and natural gas are examples of : *
1 point
14. The hardest coal containing maximum amount of carbon in it is *
1 point
15. Which of the following is suitable for preventing an iron frying pan from rusting ? *
1 point
16. Most synthetic fibres have – *
1 point
17. Pyrosulphuric acid leads to skin and breathing problems resulting in death. It is a *
1 point
18. Fractional distillation of petroleum in a fractionating column is carried out in a *
1 point
19. Any substance which gives heat and light on combustion is called *
1 point
20. Thermal pollution can be reduced by *
1 point
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