In an electrolytic set-up to protect iron from corrosion, the iron is?
made cathode
made anode
used with a metal of lower electropositive potential
initially coated with tin
Correct answer is A
In cathodic protection,iron object is made cathode by connecting it with reactive elements like magnesium,zinc.
SO3 is NOT directly dissolved in water in the preparation of H2SO4 by the contact process because?
the reaction between SO3 and water is violently exothermic
acid is usually added to water and never water to acid
SO3 does not dissolve in water readily
SO3 is an acid gas
Correct answer is A
No explanation has been provided for this answer.
Sodium trioxocarbonate (IV)
Sodium tetraoxosulphate (IV)
Sodium trioxosulphate (IV)
Sodium sulphide
Correct answer is B
The characteristic test for any soluble tetraoxosulphate(VI) is the formation of white precipitate (barium sulphate) when a solution of barium chloride, acidified with dilute HCl, or when a solution of barium nitrate, acidified with dilute nitric acid is reacted with it.
Clothes should be properly rinsed with water after bleaching because?
the bleach decolourizes the cothes
chlorine reacts with fabrics during bleaching
the clothes are sterilized during bleaching
hydrogen chloride solution is produced during bleaching
Correct answer is D
No explanation has been provided for this answer.
Which of these metals CANNOT replace hydrogen from alkaline solutions?
Alulinium
Zinc
Tin
Iron
Correct answer is D
No explanation has been provided for this answer.