Time Left:
600
sec
1. Ionic compounds conduct electricity in:
A. Solid state
B. Molten and aqueous state
C. Powder form
D. Dry state
2. Which of the following is soluble in water but not in kerosene?
A. NaCl
B. Cu
C. Fe
D. Au
3. The metal found in nature in the free state is:
A. Zinc
B. Copper
C. Iron
D. Aluminium
4. The ore cinnabar (HgS) on heating in air gives:
A. HgO
B. Hg
C. HgCl₂
D. HgSO₄
5. The process of heating sulphide ores in the presence of oxygen is called:
A. Calcination
B. Smelting
C. Roasting
D. Anodising
6. The process of heating carbonate ores in limited supply of air is called:
A. Roasting
B. Calcination
C. Reduction
D. Electrolysis
7. The thermit reaction is used for:
A. Refining copper
B. Electroplating
C. Joining railway tracks
D. Making alloys
8. Which method is used to extract metals like sodium and magnesium?
A. Reduction with carbon
B. Roasting
C. Electrolysis of molten salts
D. Calcination
9. Which method is most widely used for refining metals like copper and zinc?
A. Distillation
B. Electrolytic refining
C. Roasting
D. Reduction
10. The insoluble impurities settling at the bottom during electrolytic refining are called:
A. Slag
B. Anode mud
C. Alloy
D. Rust
11. Rusting of iron requires:
A. Only oxygen
B. Only water
C. Both oxygen and water
D. Neither oxygen nor water
12. The green coating on copper vessels is:
A. Copper sulphide
B. Copper hydroxide
C. Basic copper carbonate
D. Copper oxide
13. Galvanisation is coating iron with a layer of:
A. Aluminium
B. Zinc
C. Lead
D. Silver
14. Stainless steel is an alloy of:
A. Iron and Copper
B. Iron, Nickel and Chromium
C. Iron and Zinc
D. Iron and Aluminium
15. Solder, used for joining electrical wires, is an alloy of:
A. Copper and Tin
B. Lead and Tin
C. Copper and Zinc
D. Iron and Aluminium
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