Q. A mixure of solid Al2O3 and Fe2O3 can be separated by the method of
1) Forth floatation
2) Magnetic separation
3) Gravity separation
4) Dissolving in Water
Q. Which of the following is used as weedicide?
1) BHC
2) 2,4-D
3) Malathion
4) Aldrin
Q. The oxide of Nitrogen used in medicine as anaesthetic is
1) Nitrogen dioxide
2) Nitric oxide
3) Nitrous oxide
4) Nitrogen pentoxide
Q. Which one of the following metals does not react with water to produce Hydrogen?
1) Sodium
2) Potassium
3) Lithium
4) Cadmium
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