"Platinum , silver, gold are normally occurs in nature ___________"
In free state
As sulphare ore
As sulphide ore
As carbonate ore
Copper sulphate (CuSO4) possesses.
Red color
Blue color
Green color
Yellow
A mixture of copper and zinc is called
Brass
Bronze
Solder
Steel
The use of tungsten in electric bulb is based on the fact that:
Tungsten is sonorous.
Tungsten is a metal.
Tungsten has a high tensile strength.
Tungsten has a high density.
Most metals react with water under different conditions. Which of the following reacts vilolently with water, evolving hydrogen?
Iron
Magnesium
Sodium
Zinc
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
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
What is the chemical formula of copper sulphate?
CuSO4
CuCO3
CuCl2
CuO
Which two of these elements are metals?
I. Iodine
II. Aluminium
III. Zinc
IV. Carbon
I and II
II and III
III and IV
IV and I
Metals react with oxygen to form ___________.
Acidic oxides
Basic oxides
Either acidic or basic oxides on depending on the metal.
There is no reaction