What is the chemical formula of copper sulphate?
CuSO4
CuCO3
CuCl2
CuO
Which one of the following is used for the vulcanisation of rubber?
Carbon
Phospohorus
Sulphur
Chlorine
A silvery liquid element 'X' is a good conductor of heat and electricity at room temperature. The element 'X' is-
Aluminium
Magnesium
Mercury
Lead
What is the chemical formula of sulphurous acid?
H2SO4
SO2
SO3
H2SO3
Which of the following are solid non-metals?
I. Carbon
II. Sulphur
III. Phosphorus
I and II only
II and III only
III and I only
All of the above
The characteristic properties of non-metals are:
I. Formation of acidic oxides
II. High density
III. Tendency to form anions
I and III only
Stainless steel (an alloy containing iron, chromium and nickel) does not rust because
Iron form a hard chemical with chromium
Chromium form a coating of oxide that protects iron
Nickel does not rust
None of these
Aluminium metal is not acted upon by pure water as:
It is a light metal.
It is not a reactive metal.
It is protected by a film of aluminium oxide.
Impurities in water are essential for reaction to occur.
Shashi performed an activity to test the properties of four unknown substance. She found the following result.
Which substance is most likely to be a metal?
I
II
III
IV
Name the most abundant metal in the earth's crust_________ .
Silver
Copper
Oxygen
