lead (II) oxide
calcium oxide
zinc oxide
lead nitrate
Correct answer is C
No explanation has been provided for this answer.
Which of the following does NOT contain aluminium as component?
Over-head cables
Duralumin
Container for caustic soda
Container for nitric acid
Correct answer is C
Sodium Hydroxide reacts with metals, such as Aluminium, Lead, Tin and Zinc, to form flammable and explosive Hydrogen gas. Hence, Aluminium cannot be used as a component for storing caustic soda.
The iron (III) oxide impurity in bauxite can be removed by?
Fractional crystallization in acid solution
dissolution in sodium hydroxide and filtration
extraction with concentrated ammonia and reprecipitation
electroysis of molten mixture
Correct answer is B
No explanation has been provided for this answer.
4: 1: 2
3:8:2
2:8:3
8:3:2
Correct answer is B
No explanation has been provided for this answer.
Ammonia gas is normally dried with?
concentrated sulphuric acid
quicklime
anhydrous calcium chloride
magnesium sulphate
Correct answer is B
No explanation has been provided for this answer.