Class 8 - Chemistry Set 3

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1. 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 Y. *

1 point

CO2

SO2

NO2

2. Which out of the following elements is ductile? (i) C (ii) Ca (iii) K (iv) Cu *

1 point

(i) only

(ii) only

(iii) only

(iv) only

3. Which of the following is a non-metallic substance? *

1 point

Sulphur

Mercury

Calcium

Magnesium

4. What is water gas? *

1 point

CO2 + H2

CO + H2

CO + H2O

Water in gaseous state

5. Which of the following metals is present in chlorophyll? *

1 point

6. In India, petroleum deposit was first found in the state of : *

1 point

Gujrat

Maharashtra

Assam

West Bengal

7. Liquefied hydrogen is a ______ fuel. *

1 point

gaseous

liquid

solid

semisolid

8. Which of the following will burst into flames when exposed to air? *

1 point

9. Which of the following statements is/are true about graphite? (i) It is a metal. (ii) It is a good conductor of electricity. (iii) It has one free electron. (iv) It is a non-metal. *

1 point

(i) & (iii)

(i), (ii) & (iii)

(ii), (iii) & (iv)

(i), (iii) & (iv)

10. The synthetic fibre that resembles wool in its properties is : *

1 point

Terylene

Nylon

Acrylic

None of these

11. Which of the following is a pollution indicator? *

1 point

Acid rain

Lichen

Tubifex

Both (2) and (3)

12. A region of ________ is called flame. *

1 point

boiling gases

burning gases

burning fuel

boiling fuel

13. Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metal does not react with dilute hydrochloric acid ? *

1 point

14. The metal which generally occurs in free state is _____. *

1 point

15. Which of the following is similiar to cotton ? *

1 point

Nylon

Dacron

Rayon

Terylene

16. Naphthalene balls used to repel moth and insects is derived from : *

1 point

petroleum

sugar

coal tar

LPG

17. Chernobyl tragedies occur in which place. *

1 point

India

America

Ukraine

Russia

18. Which of the following will give highest calorific value ? *

1 point

CNG

Kerosene

Petrol

Coal

19. Identify the incorrect characteristic of an ideal fuel ? *

1 point

It should be easy to handle, store and transport.

It should have low cost and be easily available.

It should have a low ingnition temperature

It should have a moderate rate of combustion.

20. 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 Y. *

1 point

CO2

SO2

NO2

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