All types of steel essentially contain
Iron and manganese
Iron and carbon
Manganese and chromium
Carbon and manganese
Which of these are defined as elements which form negative ions by gaining electrons?
Metals
Metalloids
Non-metals
Noble metals.
"Platinum , silver, gold are normally occurs in nature ___________"
In free state
As sulphare ore
As sulphide ore
As carbonate ore
Most metals react with water under different conditions. Which of the following reacts vilolently with water, evolving hydrogen?
Iron
Magnesium
Sodium
Zinc
A mixture of copper and zinc is called
Brass
Bronze
Solder
Steel
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
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
An element 'X; on reacting with oxygen forms an oxide X2O. The oxide dissolves in water and turns blue litmus red. The element 'X' is ________.
Metal
Non-metal
Solid
Liquid
Copper sulphate (CuSO4) possesses.
Red color
Blue color
Green color
Yellow
Zinc replaces copper from ________________.
Zinc sulphate
Copper sulphate
Sulphuric acid
Copper oxide