Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as:
Smelting
Ore dressing
Calcination
Calcination
C.
Calcination
The electrolyte used for electroplating an article with silver is:
Silver nitrate solution
Silver cyanide solution
Sodium argentocynaide solution
Sodium argentocynaide solution
Choose the correct answer from the option given below:
The I.U.P.A.C. name of acetylene is:
Propane
Propyne
Ethane
Ethane
Aluminium powder is used in thermite welding because:
It is strong reducing agent
It is strong oxidising agent
It is corrosion resistant
It is corrosion resistant
Choose the correct answer from the options given below:
A compound X consists of only molecules. Hence X will have.
A crystalline hard structure
A low melting point and low boiling point
An ionic bond
An ionic bond
Choose the correct answer from the option given below:
The main ore used for the extraction of iron is :
Haematite
Calamine
Bauxite
Bauxite
Choose the correct answer from the options given below:
Ionisation potential increases over a period from left to right because the:
Atomic radius increases and nuclear charge increases.
Atomic radius decreases and nuclear charge decreases
Atomic radius increases and nuclear charge decreases
Atomic radius increases and nuclear charge decreases
Choose the correct answer from the options given below:
When fused lead bromide is electrolyzed we observe.
A silver grey deposit at anode and a reddish brown deposit at cathode.
A silver grey deposit at cathode and a reddish brown deposite at anode
A silver grey deposit at cathode and reddish brown deposite at anode.
A silver grey deposit at cathode and reddish brown deposite at anode.
If an element A belong to period 3 and group II then it will have:
3 shells and 2 valence electrons
2 shells and 3valence electrons
3 shells and 3 valence electrons
3 shells and 3 valence electrons
