All types of steel essentially contain
Iron and manganese
Iron and carbon
Manganese and chromium
Carbon and manganese
Which of the following will displace copper from a solution of copper (II) sulphate?
I. Zn
II. Fe
III. Ag
IV. Mg
I and II only
II and III only
I, II and III only
I, II and IV only
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
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
Most metals react with water under different conditions. Which of the following reacts vilolently with water, evolving hydrogen?
Iron
Magnesium
Sodium
Zinc
The characteristic properties of non-metals are:
I. Formation of acidic oxides
II. High density
III. Tendency to form anions
I and III only
All of the above
What is the chemical formula of sulphurous acid?
H2SO4
SO2
SO3
H2SO3
Zinc replaces copper from ________________.
Zinc sulphate
Copper sulphate
Sulphuric acid
Copper oxide
Which of these metals is found in the alloys of brass and bronze?
Copper
Tin
Which one of the following is used for the vulcanisation of rubber?
Carbon
Phospohorus
Sulphur
Chlorine
