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Question 1 of 30
1. Question
Chemically rust is
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Question 2 of 30
2. Question
Setting of Plaster of Paris takes place due to
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Question 3 of 30
3. Question
Heating pyrites to remove sulphur is called
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Question 4 of 30
4. Question
The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?
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Question 5 of 30
5. Question
During smelting, an additional substance is added which combines with impurities to form a fusible product. It is known as
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Question 6 of 30
6. Question
The electronic configuration of three elements X, Y and Z are as follows:
X = 2, 4, Y = 2, 7, Z = 2,1 Which two elements will combine to form an ionic compound and write the correct formula,CorrectIncorrect -
Question 7 of 30
7. Question
An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
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Question 8 of 30
8. Question
Galvanisation is a method of protecting iron from grudging by coating with a thin layer of
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Question 9 of 30
9. Question
The electronic configurations of three elements X, Y and Z are X – 2, 8; Y – 2, 8, 7 and Z – 2, 8, 2. Which’of the following is correct?
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Question 10 of 30
10. Question
Copper objects lose their shine and form green coating of
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Question 11 of 30
11. Question
Which of the statements about the reaction,
ZnO + CO → Zn + CO2 is correct ?CorrectIncorrect -
Question 12 of 30
12. Question
In extraction of copper, the flux used is
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Question 13 of 30
13. Question
Metal always found in free state is:
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Question 14 of 30
14. Question
The earthy impurities associated with mineral used in metallurgy are called
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Question 15 of 30
15. Question
A mineral is known as ore if metal
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Question 16 of 30
16. Question
Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity?
Zinc, Iron, Magnesium, SodiumCorrectIncorrect -
Question 17 of 30
17. Question
Al2O3 + 2NaOH → …… + H2O
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Question 18 of 30
18. Question
Non-metals form covalent chlorides because
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Question 19 of 30
19. Question
The highly reactive metals like Sodium, Potas-sium, Magnesium, etc. are extracted by the
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Question 20 of 30
20. Question
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
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Question 21 of 30
21. Question
An iron nail was suspended in CuSO4 solution and kept for a while the solution is
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Question 22 of 30
22. Question
Which one among the following is an acidic oxide?
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Question 23 of 30
23. Question
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called
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Question 24 of 30
24. Question
The sulphide ore among the following is
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Question 25 of 30
25. Question
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using
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Question 26 of 30
26. Question
Most abundant metal on the surface of the earth
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Question 27 of 30
27. Question
Some crystals of CuSO4 were dissolved in water. The color of the solution obtained would be
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Question 28 of 30
28. Question
In thermite welding a mixture of …… and …… is ignited with a burning magnesium ribbon which produces molten iron metal as large amount of heat is evolved.
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Question 29 of 30
29. Question
Zone refining is used for the
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Question 30 of 30
30. Question
In the thermite process, the reducing agent is
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