General
✓✗Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
General
✓✗Which one of the following can be used as an electrolyte?
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Metal chloride
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Non metal chloride
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both ‘A’ and ‘B’
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none of these
General
✓✗Which of the following alloys contains mercury as one of the constituents?
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Stainless steel
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Solder
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Duralumin
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Zinc amalgam
General
✓✗Out of the following oxides, the amphoteric oxide is
General
✓✗Out of aluminium, copper, calcium and tin, the most reactive metal is
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aluminium
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copper
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tin
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calcium
General
✓✗Cinnabar is an ore of
General
✓✗Quenching is
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strong heating
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rapid cooling after heating
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heating after cooling
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treating with salt
General
✓✗When copper is treated with dilute HNO3, the gas evolved is
General
✓✗Highly reactive metals are extracted by
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calcination
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roasting
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electrolysis
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chlorination
General
✓✗The elements whose oxides can turn blue litmus solution red are
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lithium and sodium
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copper and potassium
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carbon and hydrogen
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phosphorus and sulphur
