Which are the alloys of zinc?
Brass, bronze
German silver, brass
Bronz , coinage alloy
Coinage alloy, german silver
Which is the reducing agent in the extraction of Iron?
CaCO3
FeO
CO
SiO2
Which of the following is a wrong combination of metal and non metal?
Which of the following gas is evolved when dilute mineral acids are treated with metal hydrogen carbonates?
H2
O2
CO2
In the process of electrolytic refining of metal M, the anode, the cathode and the electrolyte are
impure M, pure M , the metal salt
the metal salt, impure M, any salt
the metal salt pure M any salt
pure M impure M the metal salt
The smell of hydrogen sulphide resembles the smell of.
rotten eggs
rotten tomato
incense
petrol
Bauxite is the ore of
Potassium
Iron
Copper
Aluminium
From the below statements which is wrong one
Froth floatation is used for the concentration of sulphide ores
Calcination is used to remove the impurity from CaCO3
Powdered ore is strongly heated. This process is roasting.
From Magnetic nature of ore impurity is removed using magnetic roller.
The reaction of hydrochloric acid with limestone leads to the production of gas X, which turns lime water milky.Gas X is
carbon dioxide
carbon monoxide
hydrogen peroxide
hydrogen sulphide
