WorksheetsElements, Compounds and Mixtures
Total questions: 20
Worksheet time: 10mins
Magnetic Separation is used to separate non-magnetic materials from magnetic materials.
True
False
How many elements are known till date?
118
108
116
120
what is the chemical formula of aluminium oxide?
Al₂O₃
Al3O3
Al4O5
Al3O₃
Which of the following is an example of metals
Helium
Oxygen
Water
Iron
Elements are not pure substances which contain same type of atoms.
True
False
Metalloids are elements which exhibit the properties of both, metals and non metals
True
False
Elements with 2 atoms are called
Diatomic elements
monoatomic elements
polyatomic elements
none of these
What is Atomicity?
number of elements in compounds
number of atoms in mixtures
number of atoms in molecules
number of molecules in mixtures
what is the chemical formula of nitrogen dioxide?
N2O
2NO
NO2
NO3
Boron is?
Polyatomic Element
Diatomic Element
Monoatomic Element
None of these
which chemical is added in loading?
Chlorine
Alum
Residue
All of these
Which is the only non metal that is liquid at room temperature?
Bromine
Mercury
Iodine
Phosphorus
A compound is a completely new product that does not retain the properties of its constituent element.
True
False
Metals are poor conductors of electricity.
True
False
_________is most often used to control phosphorus release from the lake bottom sediments
Alum
Chlorine
Sodium
Nitrogen
There are 116 elements known till date.
True
False
Which metal is liquid at room temperature?
Mercury
Bromine
Sodium
Iron
Which of the following is a poor conductor of electricity?
Sulphur
Sodium
Nitrogen
None of these
Who gave oxygen it's name?
Joseph Priestley
Antonie Lavosier
John Dalton
Demitree Mendeleev
Who discovered oxygen?
Antonie Lavosier
Joseph Priestley
John Dalton
Demitree Mendeleev
