Corrosion can be prevented by
1.alloying
2.tinning
3.galvanizing
4.all of the above
During roasting which of the following poisonous gas is mainly produced
1.CO
2.CO2
3.SO2
4.N2O
Elements which have properties of metals and nonmetals are
1.amorphous
2.crystalline
3.metalloids
4.metals
Which of the following non-metals is liquid at the room temperature?
1.iodine
2.bromine
3.carbon
4.sulphur
Galvanic cells are also named as
1.electrolytic cells
2.battery cells
3.daniel cells
4.john cells
Galvanization is a method to
1.protect the iron metal from corrosion
2.extract iron from its ore
3.protect food from rancidity
4.improve the ductility property of the metal
Which of the following methods is not used for the prevention of corrosion?
1.greasing
2.painting
3.plating
4.Heating
Rusting of iron could take place in
1.distilled water
2.ordinary water
3.distilled and ordinary water
4.none of the above
Voltaic cells generate electricity by
1.spontaneous redox reaction
2.non spontaneous redox reaction
3.sublimation reaction
4.thermochemical reaction
Widening of a river valley takes place due to
1.corrosion
2.lateral erosion
3.corrasion
4.hydraulic action